Howdy, Stranger!

It looks like you're new here. If you want to get involved, click one of these buttons!

Buick LeSabre Heating / Cooling



  • When I start my 94 LeSabre Limited, the A/C fan will not come on 99% of the time. The Dual Automatic Control will be dark, no lights at all. After driving about 5 minutes or so, the fan will begin to start then stop several times before finally coming on. The control head will then show the blinking set temperature and the Dual and Defrost lights will be on. The air is now blowing out of the windshield vents. If I repeatedly and in rapid succession press the Auto burtton, the air will eventually come out the dash vents. Is there anything I can do to try to fix this? The buttons on the passenger control have to be pressed repeatedly to move the indicator. On the main control, the buttons must be repeatedly pressed to take effect.
  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 21,242
    edited September 2010
    Your problem might be a defection head unit or control unit on the dash. I would suspect, however, a ground problem. Are you in a wet climate with snow or lots of rain that carries into the car and wets the carpet near the door as the foot drags over it?

    I think the AC control grounds at the buss that's under the door sill plastic right where your feet go into the car. It's bundled with other cables and wrapped with tape. They corrode. You might try hitting against that area when the AC control won't work and see if things make connection.

    Does anything else not work at times, like the power door locks?

    The blinking could just be a reaction to having the power go on and off as the connection is made.

    AC units are the same for 92-94 leSabres and 91-94 Park Avenues. You might pick up a couple from a junkyard and see if they work better. They should be an easy removal after pulling the plastic trim off the front of the dash.

    You might also have a problem with the blower motor control module which changes the voltage to the motor to vary speeds. This replaced the resistor in older cars with set speeds. It's a power transistor and some circuits. Follow the power leads from the blower motor. It will be close by and will stick into the tunnel where the blower motor pushes the air; the air movement cools it. These sometimes fail with odd speeds compared to the 6 or 7 speeds manually selectable. Sometimes they keep the blower motor on even when the key is turned off, draining the battery.

    You can connect the blower motor directly to battery power and a ground with a fuse to see if it runs fine at full speed. Motors wear and stick and do funny things with age and detrioration.

    The air flow direction may be similar to the problem with the connector on the programmer box on the corner of the HVAC box under the dash. The vacuum sucks the soft plastic closed. It usually happens to the dash vacuum tube that closes off the air to the defroster to make it come out the dash front. If the air won't come out the dash at first, see if it's coming out the defrost.

    I can give a link for bypassing the softened connector if you find that's what's happening. It also could be just poor vacuum due to rotted or cracked vacuum lines under the hood or a cracked vacuum reservoir tank that's losing vacuum. When there's no vacuum the unit go to defrost direction for safety.

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

  • Thanks for the reply. I failed to mention in my original post that I have had 3 control heads in this car ... 1 was even purchased 'new' from an AC-Delco parts distributor. I am beginning to doubt it is the Control head. When the system is off, there is no exterior temp display - with any of the heads that were in it. Truly, it is as if there is no power to the unit then all of the sudden it comes on. The control is the same as the 91 - 94 Park Ave? I dont think that there is a fan motor issue since the fan does run. Is there any way to test the control head? Thanks again.
  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 21,242
    You have had three new control heads in it. I doubt it's the control head.

    I'd check at the buss ground connections. I would take a look at the one of the left--check my pictures I linked. They're not hard to get to.

    My 93 had started occasionally losing control of the heater (manual AC) and the system reverted to defrost and the AC turned on. Probably the default was the compressor on. The lights on the head did stay on. At the same time the door locks would quit working. Then after a while driving or after parking the pair would start working again at the same time.

    I never got to troubleshoot it by checking the buss: my wife made me trade it for a pretty red 03 leSabre when they came out with a pure red again.

    If you are enough of a cobbler, it would be interesting to connect to the power lead of the AC head and use an LED light to show when it had power and when it didn't have power.

    OR I think take the ground wire for it and parallel a 2nd ground lead along with the other and see if that eliminates your symptom.

    I think you're into a diagnosis stage here.

    The only other thing I can think of is the ignition switches might have a separate contact that's worn and is making and breaking contact. I never have physically checked to see how many different contacts are in the ignition switch--that's the actual switch down on top of the lower steering column and not the key cylinder at the top.

    I do know a few people have had them wear out with certain things dying while driving, but I can't remember if that was the car cutting off motor-wise or if it was accessories.

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

  • I finally got around to looking at the control board and you where correct there were 4 pink colored round not square 120 ohm resistors that had signs of excessive heat and they basically unsoldered themselves thanks for the fix. Working like it was new.
  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 21,242
    >round not square 120 ohm resistors that had signs of excessive heat a

    Thanks a lot for posting back about what you found. It lets me know I steered someone the right way and lets people reading know what worked if they have the same symptoms you had.

    Thank you.

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

  • jj14jj14 Posts: 2
    It seems like im having the same problems most 94-98 lesabre owners are having..I need help!

    First off I have the digital control w/ passenger side climate control as well..

    When I start my car the ac/heat control unit will blink for about 30 seconds..when its blinking nothing but cold air will blow in the winter and nothing but warm air will blow in the summer...when it finally stops blinking in the winter on the driver side will get heat, the passenger side will be ice the sumer the drivers side will get air sometimes and the passenger side will be hot...

    I have been told that it is the AC heat programmer by a local shop and I have also been told that it is a blend door actuator by my mechanic..these are 2 big differences..also when I turn the key (without the motor on) i hear what seems to be my blend doors moving while the ac/heat programmer is blinking...

    I have read many forums and it seems to be the actuator but I dont know which actuator to get..I have a friend whose parting out a 94 lesabre so I could just get it from there if I knew which one to get
  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 21,242
    edited December 2010
    I can tell you I've had the same symptoms. The HVAC box under your dash uses vacuum actuators to change the path of the air flow. But it uses electric actuator motors that move wire rods and move doors inside the box to change the temperature by moving blend doors that make more or less air go through the heater core for heating.

    You can take off the hush panel under the passenger side dash. It has about 3 screws holding it to the front of the dash and two little nuts that hold it to the firewall above the carpet.

    You can then see if you are able to lie on the floor the actuator on TOP of the HVAC box with a metal rod that attaches to a white plastic arm that moves the door inside the box. If you can move that arm with about the force to move a library book sliding it on a formica countertop, the gear inside the actuator is cracked. That lets the gear slip on the gray hub. It's the gray hub that moves the metal rod. I took mine out, disassembled the actuator, glued the nylon gear to the hub, and put it back in after drying overnight. So far it's working. Note that the gray hub and arm outside the actuator box has a tab that operates in a slot of about 180 degrees. That limits the movement; be sure to keep the tab in that slot.

    This is the HVAC box with the actuator circled on top. The bottom actuator goes to the programmer box and is for the passenger. You should be able to turn the key ON and operate the temps on the controls and make those actuators move. You may be able to tell the top one slips on the hub.


    The actuator looks like this:


    If you glue the gear in place, consider the gear's movement range so that the crack is not in the movement allowed.

    Replacement actuators are available at different stores and I am thinking the actuator is in the $50 range.

    Some have snapped the wire rod out of the white plastic (just push backwards--it snaps into a groove) and held the heater vane in place with a coat hanger to manually move the temp door.

    Better access to the repair site can be had if you take off the 6 screws along the bottom of the glovebox hinge. It all drops down and you've got great access.

    Good luck. Hope this info helps. You do not need a programmer box. I am 99.99% sure you'll find you can watch the actuator slip or make it move by pushing on the metal rod.

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

  • Thanks imidazol97: Thanks for the great experience sharing & photo. That's very helpful since I have not yet gotten to the underside of my car.

    Thanks for sharing
  • sed55sed55 Posts: 3
    How much for the digital control out of the '94. I need to keep on trying them until I can finally get one that a) turns on all the time and b) changes when I press the button. Mine I have to pound on the buttons to get them to change and forget about any temp changes with it. I have not been able to get a viable cause other than to kerp on throwing controls into it. I have tried three already. This is a '94 LeSabre.
  • jj14jj14 Posts: 2
    Thanks for the detailed instructions!!

    I have looked at rockauto and looked at the actuators. I have a CJ2 code for my buick so I need the part #16141822 which is, like you said, in the $50 range...

    my question is..if I get my mechanic (who also said I needed a blend door actuator) to fix this, will I be able to get hot heat on both the driver and passenger side in the winter, and cold air on both sides in the summer? Also, will this eliminate the blinking on my control unit?

    Again thanks so much you have no idea how much I appreciate it! :)
  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 21,242
    >I be able to get hot heat on both the driver and passenger side in the winter, and cold air on both sides in the summer? Also, will this eliminate the blinking on my control unit?

    I can't be there to diagnose, so I can't guarantee.

    If you watch the movement of the actuator arm when you change the settings for driver side from cold to hot, you should be able to tell it's not moving the full range due to slipping. When moving, you should be able to push your finger against the rod to help it move one way or the other. And that should give you full heat or full cold.

    That was my diagnosis. I could move the arm with moderate finger pressure. Many Pontiac owners have had the same problem. Theirs is harder to get to the two screws holding the actuator in place because of the placement of dash and shape of the instrument panel.

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

  • atxcaratxcar Posts: 3
    Looking through the threads I think my heater / AC control unit is bad, but would like a second opinion before replacing it. It's a 1993 Buick LeSabre, Custom with the non-digital control with push buttons that are supposed to light up; a slide lever for the heat control; another slide switch for the fan; and a rear defog button. Not a dual unit. Seems to be AC Delco part number 15-71887, oem 16145214.
    The car is fully maintained, but with high miles (100k+).
    At the moment, it wants to run the the AC through the defrost, but I can push the button to go through bi-level and it will do so with cold air for a while (time varies). I cannot turn it off by pushing the "off" button. None of the buttons seem to respond properly, and it seems to switch between settings randomly with the air flowing to that selection. Sometimes the buttons light and sometimes they do not.
    Initially I had to fix a ground disconnect at the battery and another loose (smoking) ground at the top, middle of the firewall between the relays and big fuses. I also had the AC system recharged. Prior to the ground fix, the buttons would light up in a circular pattern, switching the controls as they rotated. At least now that has stopped. The driver side interior ground seems good too. The car did have an aftermarket alarm in the past.
    The AC does blow cold and I can move the temp lever to have it blow hot.
    The problem is not being able to turn it off and not being able to select where the flow goes properly.
    Any other ideas or suggested tests? Could it be vacuum or the reservoir? The other part by the glove box?
    If odds are that it's the control, which other makes and models would have the same control unit? 91-94 Park Avenue? What else? These things seem to be getting harder to get.
    Thanks for your help.
  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 21,242
    It does sound like the electrical control unit in the dash might be at fault. You say you're cleaned the ground on the driver side under the carpet under the door sill? There also is one on the passenger side. I do not know WHICH one is the ground for the heater AC unit.

    I do know my 93 had started losing control of the heater. It would go into AC mode with the compressor running and the power door locks would not work. I did not get to isolate which ground was the one before we traded it for a newer leSAbre.

    The dash control unit is for 92-94 leSabres and Park Avenues including Ultra according to RockAuto--when you click on the blue linked number it shows all vehicles using that part.

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

  • atxcaratxcar Posts: 3
    Thanks for the second opinion. I was lucky enough to find a used control unit from a similar 1992 LeSabre in a nearby salvage yard for $50, ready to go. Swapped it out and the problem is fixed.
  • advent70advent70 Posts: 4
    edited August 2011
  • Hi all

    I have 2004 Lesabre Limited with about 89K miles. Has run flawlessly since purchased new. Now experiencing lack of heat in passenger cabin, and noticed recovery tank was low. Refilled to proper fill line, heat returned, but now noticing heat is ebbing again. Believe heater core is clogged. Car engine temp is fine, all running OK otherwise.

    What are the proper steps to get to the hoses to perform a heater core flush? Is a garden hose sufficient?

    Second, if I go to this trouble, should I go ahead and replace the thermostat? If so, does that imply a drain and refill of the system, or can I get by just replacing the thermostat (even if I might spill some coolant along the way)?

    Any other tips/hints appreciate.d
  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 21,242
    edited October 2011
    If you get enough heat part of time, then core is not clogged.

    Pull the dipstick and look at the color of the oil. It should be relatively new looking or dark, depending on how long it was changed. If it looks chocolate like a milky look, there may be coolant getting into the oil due to leaks at the intake manifold gaskets, the EGR tube inside the upper manifold, or the gasket at the throttle body on the end of the upper intake. Coolant in the oil is something to be taken care of quickly, not in a month or so. Coolant in the oil damages the metal of the bearings. The oil with coolant needs to be gotten out and replaced with fresh, even cheap oil, until you get the internal leak fixed.

    Look for drips under the car after it has been driven and well heated and shut off.

    First, with engine cool check the coolant in the radiator. Use the radiator cap to check the level of coolant--not the reservoir. Fill the radiator to the top. Before putting the cap back on, check the underside of the cap for a gooey substance. If there, clean with a small brush and dish detergent, such as a toothbrush. The little disk on the underside of the cap should move free. That's what lets the coolant back into the radiator when it cools, but keeps the pressure in as it heats up.

    Run the car for 10-15 minutes when you go somewhere, then with car parked speed the negine at 2500 rpm for 10 seconds or so, let idle for a few seconds and repeat 4 more times. If you can put the front of car higher than the driver seat on an uphill slope like a driveway that is better. That should get the air out of the heater core according to the service manual.

    Then after car cools check to be sure the radiator level. Fill again if necessary. All this time, keep the level in the coolant in the reservoir between the cold and hot marks.

    Now check the level of coolant in the radiator and the reservoir after several days. If it has gone down again and there are no obvious drips, then look for leaks at the water pump, the plastic elbow at the lower intake manifold to the bracket of the idler pulley for the belt, and at the hose connections. Do this with a flashlight and right after the car has been driven hot and shut down so there's pressure in the radiator so you're more likely to see coolant dripping.

    When the level in the radiator drops a little, air gets into the heater core and less coolant coes through. That means less heat. Often when the engine speeds up, the heat will improve and will drop off at idle.

    There are a couple of other things to ask about, but it's important to establish if you have a leak outside or an inside leak first. Then we can worry about the current coolant.

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

  • atxcaratxcar Posts: 3
    Hi Soonerdew, since you topped off your system and the heating worked it indicates that coolant was circulating through the heater core and it is not plugged. Check your level again, most likely it is down again and needs more. If that's the case, your system has a leak in it somewhere and you need to fix it. Check the level in the radiator too, not just the recovery tank.

    If the levels are good, it may now actually be plugged. Two heater hose lines come through the firewall so to flush the heater core disconnect them and use your hose to push water through. If it doesn't go through, it's plugged and you may need to replace the core, which is quite a bit of work.

    Good Luck
  • There are no leaks of any kind on the vehicle. The garage floor (where its parked every night) is bone dry.

    I will top off the radiator as you suggested and see if that affects the heating situation. Just to be clear, the heating isn't intermittent; a partial refil of the reservoir restored the heater to normal condition, but now (about six weeks ago, or so) the hot air temp has dropped again. Your air in the system description sounds apt.

    The manual indicates replacement of the thermostat requires draining the system, but it would seem I could replace it with the engine cold and risk losing/spilling only a relatively small amount of coolant. Does that makes sense? Would be much easier on the wallet to change it myself, and besides I have no faith in nearly any of the local GM dealers not to gouge me with unneeded/extranous repairs.

    Is a true cooling system flush a good idea? I've done it once already with this vehicle a few years ago, around 30-40K miles due to the stories of sludge related to DexCool, but was hesitant a 2nd time as I wasn't convinced a frequent high-pressure flush opposite the normal coolant flow didn't at least risk damaging something.
  • Thanks for your reply!

    As I mentioned in response to the prevoius post, there are no leaks at all evident on the vehicle - garage floor is bone dry.

    I will check levels, top off as noted, and post back here.

    Thanks, all
  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 21,242
    edited October 2011
    >I could replace it with the engine cold and risk losing/spilling only a relatively small amount of coolant. Does that makes sense? Would be much easier on the wallet to change it myself,

    You asked about that earlier, and I missed it because I was looking at other things.

    Does your temperature gauge stay where it has been since new? Mine always was right on the middle mark and one year it was down a couple of needle widths on my 03. I did replace mine with a quality brand.

    If your needle is where it always was, thermostat is probably okay. I doubt the thermostat is cause of the heater not producing. My quick check is after driving for an errand taking 10-15 minutes, I put my hand on the upper radiator hose. I can't hold it there for more than 10 seconds approx. because the heat builds into my hand. That tells me the thermostat is opening and keeping the temperature in the heads up.

    When I first start the car with it idling after a few minutes I check the temp fo the upper radiator hose. The lowest part on the underside may be warmed but the top of that lower part and the rest should be still cold. Not as cold as when the engine started, but not warm. Then as the thermostat opens after idling longer, the rest of the hose warms.

    That's my second check on the thermostat letting too much coolant past during warm up.

    You will lose about 1 pint of coolant if you just take the thermostat out. I use a plastic hose and siphon coolant out of the radiator into a container first--couple of quarts. Then open up the two bolts on the housing. Lose very little that way. Be sure to seat the new thermostat into the groove in the middle of the rubber seal the old one is in. You can buy a new one if you want. There is no paper gasket on these...

    If you take out more than couple of quarts, you may have to work to refill the coolant again to get air out.

    Note, there is a bleeder screw on the thermostat housing to let out the last bit of air after getting all the air out of the heater and radiator. Open it slowly until coolant oozes out with engine warmed up.

    I never had my system pressure flushed. That's a money maker for the garages just like trans flushing.

    I drained coolant every two years. Put in water and ran to circulate and engine heated up to temperature. Drained and put in proper amount of DexCool to give a 6-7 quart amount out of the 13 quarts for the whole system. Or you can use Prestone Mixes with All Types and Colors. It appears to be the same as DexCool when you look at contents.

    As for the leak look carefully with a flashlight at the elbow under the intake manifold on the belt side of the engine. The O-rings sometimes seep or the plastic elbows crack.

    Of course a water pump is always possible.

    Otherwise, a likely seep if your internal loss is slow is the gasket on the throttle body. That's where my 03 was seeping and losing small amounts of a month or two if I drove a long trip. I had the intake replaced and lower gaskets replaced. I had a mechanic local do it who lets you supply your own parts. I had an APN intake put on with a metal sleeve in the EGR passage.

    I actually determined my leak was internal by having an oil analysis done. I had switched to synthetic oil and wanted to know how much additive was left after 6-7000 miles. The oil sample also showed low levels of coolant. Running 6-7 instead of 3-4000 makes the coolant show up better. So low levels at that length showed a slight loss into the engine combustion. in Ft. Wayne. They'll send you a free mailer container.
    Best $25/$35 I ever spent. I learned my oil was still great at that distance and easily good for 10,000 and verified a slight seep. I change oil at 6-7000, however.

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

  • Thanks again...

    Temp gauge appears to be registering about where it always has - right smack in middle of range to *slightly* beyond.

    Thanks for the confirmation on my suspicions about the flush business.

    I'll pick up a bottle of DexCool on the way home, top off the radiator, and see what happens. Sure hoping I don't have the manifold gasket problems...

    Thanks again. Will advise.
  • One other bit of info...I took a few minutes to go out to the car (in the parking lot) and check the radiator level - which is low. I'll top that off en route home as I have a spare bottle of DexCool in the trunk.

    The gasket on the underside of the radiator cap rotates freely.

    The oil on the dipstick appears perfectly normal to me - just plain oil that's probably in need of a change here in a few weeks :) No milky color evident.
  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 21,242
    At 85000 it's early for the major problems with intake gaskets. I would suspect your throttle body gasket, which is what mine was. That gasket is about 10$. Taking off the throttle body is lots of little things and three compression washers and screws.

    If you verify you may have internal seep at slow rate even when car is run hot and system is pressurized, if you are fairly handy that comes off. You can clean the inside which gets gunked up with oil vapors forming a sludge. The sludge on some causes the throttle plate to stick slightly when the throttle body cools. So you start the car and put in drive. When you push onthe gas the throttle sticks so you have to push harder and then you get more gas than you wanted when it lets go.

    Cleaning and putting on a replacement gasket kills two birds. My mechanic showed me the old gasket. He said the originals were thinner than replacements. So when the plastic of the upper intake manifold warped slightly with heating and cooling, the gasket cannot keep enough pressure all around to prevent seepage when the coolant is pressurized at 15 lb. That's partly why GM did a recall on 01-03 to put on stronger washers to tighten screws more to hold gasket tighter. They also put in sealer tablets of ground organic which will stop seeps by plugging the crack. They should have just replaced the gaskets at that time, but that was lots more expensive than sealer tablets and washers.

    Have you changed transmision fluid?

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

  • question regarding the throttle body - I thought the engine in my particular beast was SFI, not throttle-body. Per the VIN, it's engine code K, which I thought was SFI. It's an 04 Lesabre Limited..
  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 21,242
    edited October 2011
    The throttle plate in the throttle body is controlling only the air. The injectors are right next to the intake valves.

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

  • imidazol97, thought I'd give you an update.

    Amazing what you find out when you're not in a hurry.

    When I went out to top off the radiator, I noticed that the coolant level was not nearly as low as I had thought. I put in *maybe* a half-cup of DexCool and it nearly overflowed, so the coolant level wasn't really an issue. On the way home, with the ambient ext air temp around 50-55, and the thermostat set to about 80, I was getting cool air out the front vents. The only warm air would come from the passenger side when I engaged the passenger temperature switch up a couple of notches. When I had the passenger temp switch at normal, the air from all vents was the same.

    Now, fast-forward to this morning, with the engine cold, and the outside temp about 35. Garage floor had only a bit of DexCool I had spilled earlier (sloppy me), and then I fired up the car and I had warm air from all vents inside of five minutes and was toasty comfortable all the way to work as if nothing were wrong.

    I'm beginning to believe the coolant level was a red herring, and starts to sound to me like a sticky/temperamental thermostat that's not opening/closing consistently/properly, and that's surely something I could handle, I think. Any thoughts?

    Thanks again for all the good insights
  • imidazol97imidazol97 Crossroads of America I70 & I75 Posts: 21,242
    edited October 2011
    I think you are getting the subjective observation that the air from the vents is coming out at 80 or so and feels cool because it's moving. If the temperature gauge on the dash, and the digital readout if your car has it, say the engine temperature is in the right range, there's nothing wrong with the thermostat.

    The moving air feels cooler. I usually make sure the control is set on VENT to be sure the compressor is off. If the AC compressor is on, it can make the moving air at 80 feel cool too. I turn the temperature up to 82 or 83 and turn the blower speed down to 1 or 2. That puts out warm air that's not moving so fast.

    I don't think you did my check on the cold engine with starting and letting it idle and feeling the upper radiator hose to be sure the thermostat is closing. Only the bottom of the hose should warm slightly as the engine itself warms up. Then you'll feel the whole hose start to warm as the thermostat starts to open and close to keep the water temp at the upper engine at 195 degrees.

    If the thermostat passes that test, I believe it's fine. Just watch the dash gauge for variation from the usual place it runs.

    Keep watching the level in the radiator. It should be full up to the return tube opening when you take off the cap cold. It should suck coolant back in from the reservoir tank as the system cools. The bottom of the cap should be sitting in coolant. If there's an air space, that's not usual. If it doesn't stay full, you need to find out why the level is changing.

    2015 Cruze 2LT, 2014 Malibu 2LT, 2008 Cobalt 2LT

  • imidazol, I'm not sure which part you're suggesting is subjective. Are you saying I'm being tricked by evaporative cooling? Don't think so....In all cases, there was air blowing out from the front vents. Yesterday afternoon, the temperature of that air never increased regardless of the temperature at which I set the heater control - as high as 80 or more. This morning, however, there was tangible hot air blowing from all vents, and the temperature of that air dropped as I changed the temperature on the main control. The air coming out the vents yesterday afternoon was cool - and the temp on the passenger side vents increased as I adjusted the passenger heat control up, and dropped as I adjusted it down. So, perhaps I'm missing something (or have a serious neurological issue :)), but I don't think I'm misreading anything there.

    I did not attempt the temperature test you recommended. I will do that tonight and advise.

    Thanks again for the advice.

    I will perform your heat test tonight and let you know what I find out.
Sign In or Register to comment.