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Buick LeSabre Heating / Cooling

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  • How many miles on the car? Yes
    Which HVAC system does it have? I dont know
    Has the water pump been replaced? Not by me, the car dont get hot
    Which type of coolant has been in it? Regular antifreeze
    When it's running and the fan is on HIGH, and you touch both heater hoses next tot he firewall, are they nearly the same temperature or is one noticeably cooler? Yes. I have flushed the heater core nothing came out but clean water. I replaced the thermostat put in new antifreeze. The heather will blow hot air for a little while then right back to cold and keep doing this. Sometimes it will stay warm for a good while then right back to cold air. Thanks for any information. Michael

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  • I for got 177,000 miles
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,690
    How many miles on the car? 177,000

    Which HVAC system does it have?
    Does it have a digital readout with numbers? IF so, the actuator motor that moves the temperature vanes inside may be broken and moving the vanes that direct how much air goes over the heater core wrong.

    Has the water pump been replaced?
    The water pump may have not be working well due to corrosion of the vanes.

    Which type of coolant has been in it?
    If it had DexCool in it and it had not been changed every 2-3 years or someone added the old type green antifreeze, the DexCool may have been deteriorated and it forms a sludge that can block things.

    When it's running and the fan is on HIGH, and you touch both heater hoses next tot he firewall, are they nearly the same temperature or is one noticeably cooler?
    This is a symptom of a clogged heater core or poor circulation.

    One thing is that you might have an air pocket in the heater core.
    After draining antifreeze, when car is at full temperature after being driven 10 minutes or so, run the motor at 2500 rpm for 10 seconds, idle, then repeat up to 5 times. This will move the air out of the heater core.

    Check to be sure coolant in the radiator is at full level up to the cap.

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  • My heater suddenly only blows warm air. Sliding the temperature control to cold does nothing. Where do I start troubleshooting this? Thanks for your help.
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,690
    Is it automatic temp control with the digital temperature readout or is it manual temperature control where you slide a lever?

    Either way you're looking under the dash for an actuator arm that moves a vane inside the heater box. Take off the hush panel under the passenger side. I suggest taking off the glovebox door with about 5 more screws on the hinge. You'll be able to see this

    link title

    and you're looking for white arm on top of the box, I believe, if it's manual. If it's automatic it has that arm for the driver and the lower arm for the passenger. the lower arm comes out just to the right of the bottom screw marked by two red lines in picture.

    Look for both of these arms to move if you turn key ON and change the temperature settings and wait a few seconds>

    BTW if auto, does the passenger temp change when pressing buttons on the passenger temp control?

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  • Some info for those experiencing this problem: (Limited with Auto A/C controls)

    Check the vacuum tank connector and tubing behind the front bumper area on the passenger side. While working on my Mom's car trying to fix this problem, I removed the connector from the vacuum tank and it snapped off the tubing instantly. The tubing had become brittle and I believe was leaking vacuum, causing the actuators to not move in their full motion. I reamed out the old tubing stuck in the connector with successively larger drill bits (cordless drill on low speed), then inserted the existing tubing back into the connector. I pushed it back onto the vacuum tank fitting, started the car and the dash vents (MID setting) were again blowing air.

    The vacuum tank is clearly visible in front of the passenger tire and behind the bumper. It's about a 4" diameter black tank with black tubing connected to the front of it. I stuck my head under the car about a foot without the need to jack it up. Be careful pulling off the connector to inspect it. The vacuum tank appears to be made of pvc and the fitting on it may be brittle also.

    I did this after pulling the programmer from behind the glove box and testing the solenoids and tubing. All appeared to be functioning normally. I then observed the vacuum actuators behind the dash (looking up from underneath the dash) as my wife pushed various buttons on the A/C control unit. The actuator arms moved, but only maybe 1/4" or so. After the vacuum connector was fixed, the actuator arms moved a good 1"-2". Short actuator arm movement would be a good indication of a vacuum leak.

    Hope this info helps somebody. It took all of 2 minutes to check the connector and 5 minutes to fix it after it snapped off. A lot easier than taking off the glove box and programmer unit!

    Good Luck -
    RangerDave19
  • It is manual temperature control, not auto.

    So far, I've found the actuator and it's linkage and watched it while I moved the temperature control and nothing happens.

    So now I need to know how to test the temp. control and how to check the actuator.

    Thanks for your help!
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,690
    Is this what your actuator looks like?

    image

    this part is used in these cars in manual AC units.

    BUICK LESABRE 1999
    BUICK LESABRE CUSTOM (1992 - 1998)
    BUICK LESABRE LIMITED (1992 - 1998)
    BUICK PARK AVENUE (1991 - 1996)
    BUICK PARK AVENUE ULTRA (1991 - 1996)
    OLDSMOBILE 88 1999
    OLDSMOBILE 88 ROYALE (1994 - 1998)
    OLDSMOBILE 88 ROYALE LS (1994 - 1998)
    OLDSMOBILE 88 ROYALE LSS 1995
    OLDSMOBILE 98 REGENCY (1992 - 1994)
    OLDSMOBILE 98 REGENCY ELITE (1992 - 1996)
    OLDSMOBILE 98 REGENCY TOURING (1992 - 1993)
    OLDSMOBILE LSS (1996 - 1999)
    OLDSMOBILE REGENCY (1997 - 1998)

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  • I haven't pulled it out yet so I'm not sure if it is like that. The top certainly looks correct. Mine has a linkage that connects to another white lever. I pushed and pulled on this gently while moving the temperature control slider but it would not move. I also tried tapping on it with a screwdriver but still now movement.

    I'll try to pull it off tonight if I get a chance.

    Thanks for your help!
  • I fixed the problem! It was the temperature control module . . . the part on the dash with the buttons and the slider. I noticed that I could move the actuator when the key was turned off, but when you turned the key on, the actuator would move back into the same "half heat/half cool" position. A trip to my local salvage yard and $25 later, my problem was fixed!

    Thanks to all who posted and helped me with this!
  • I recently purchased a 1995 Buick Lesabre Limited with 150k miles on it and an automatic climate control unit. The air will not blow at all on any setting, but the control unit in the car works. A friend said that there appears to be no electricity going to the blower motor(He used an electrical meter) when I changed the tempature settings in the car. He said it could be the climate control unit in the car or a fuse but I do not have the fuse panel cover so I do not know where the fuse is located. I would greatly appreciate any advice and advice about where to find a fuse panel cover or diagram.
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,690
    If it's automatic fan speed control or manual but has the digital readout, then your problem most likely is the blower control module.

    The check is to take the leads from the blower motor and apply direct battery power through a fuse--please use a fuse-- and see if the motor works. They do die.

    Then follow the leads from the blower motor up to the left to the top of the channel that the air goes through from the blower. On top of this boxy channel is the end of an electronic power transistor that controls the blower speed. The circuit board part sticks down into the air stream inside the box for cooling.

    You can access this by removing two screws that hold the Relay Center to the firewall above it. The wires to the Relay Center have enough give to move it up some and allows access to the screws holding the blower control module.

    You can buy modules at rockauto.com, gmpartsdirect.com, and other parts stores. You also can use recycled from wrecked cars. Just check the parts numbers. Or search on car-parts.com; you'll see the interchangeable ones from other cars.

    image

    image

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  • elaineeelainee Posts: 2
    I think I have the same problem with my blower motor. The air coming from my AC is cool, and the defrost works when I am driving because enough air comes through the vents, but the blower started working intermittently some months ago. Sometimes it would come on after I had driven a while, and then I noticed I could hit a bump and the blower would come on, sometimes. Then I found that closing the passenger door would start the blower, and this worked for a while. Yesterday, I noticed that the fan would start weakly and then gradually build in strenght, but then it began weakening and then quit. Bumps and slamming doors do not seem to be able to revive it now. I have priced blowers, but someone said it may not be the blower. It might be a loose wire or a sensor. I don't want to buy something I don't need. What do you think? Do I need a blower, a sensor, or simply some wires reattached?
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,690
    If yours is 92-99 leSabre, then your blwoer motor is under the hood on the firewall between the motor and the passenger comartment.

    You can test it by using a FUSED wire from the battery along with the ground wire and disconnecting the power to the blower and substituting the power leads from your battery. If it runs fine then, your problem is the blower motor control module or resistor pack or a connection.

    Most likely it's the blower motor has worn out. There are 5 screws holding it, more or less, and it comes out toward the motor and can be wiggled out. Some people push the car forward in park and block the rear wheels which twists the motor slightly forward leaving a little more room.

    Replacement motors for those years are relatively cheap at various stores or rockauto.com.

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  • elaineeelainee Posts: 2
    My car is a 2003. Where is the blower in that model?
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,690
    It's under the dash inside the car. Take off the hush panel above the passenger's feet.

    The motor end of the fan is down. The squirrel cage rotates in a horizontal plane. There is a connector that some people have found had poor or burned contacts. it's the one for the fan that leads to it.

    Most like the fan is toast. The brushes inside the fan and commutator wear fast. Poor supplier quality.

    Remove the carpet on the firewall by pulling it down toward the seat. You'll need the extra room. REmove three screws from fan holding it in place. Then Wiggle it out.

    Replacement should go in similarly.

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  • soonerdewsoonerdew Posts: 21
    Greetings, all.

    The blower motor on my 2004 Lesabre Ltd stopped working with essentially no warning. The electronic A/C control indicates it is telling the fan at what speed to operate, but no air is coming out.

    I have researched to the point that I suspect the blower motor and the blower control module. However, getting to the module requires I move the Dash Integration Module off its mounting bracket. I can't tell how the module is mounted to the bracket, so I don't know how to remove it.

    I have removed the blower motor, and observe that it has s three-pronged connector, and that the motor label indicates it expects 14V. Is there a schematic around that could tell me which two prongs are getting the voltage, so I could test the power @ the connector? I hand-rotate the cage on the blower, and it seems to spin without resistance, but I obviously have no reference of how freely a known-good motor should spin.

    I would appreciate any additional advice anyone might have on this issue. It appears I can order an aftermarket blower from eBay for about $60, and a control module for about $90, but if someone has some info that might suggest another course of action would be appropriate, I'd be more than grateful. It appears my aunt and uncle, who have a 2001 Lesabre, spent some $700 getting this same issue fixed at nearly identical mileage (approx 67K) :(

    Thanks in advance
  • imidazol97imidazol97 Crossroads of America: I70 & I75Posts: 17,690
    Did the blower motor stop at once, or did it not work until the car hit a bump which vibrated it so that the commutator and brushes made contact again. There has been a wear problem with the brushes on some cars.

    There also is a problem on some, but I believe earlier than your year, where the ground strap from the armature loses contact with the housing. People lengthen that lead to ensure good contact. Some people have taken apart the working end of the motor to inspect the brushes and the contact--if you have electrical knowledge, you may be able to do that. It sounds like you're dedicated to replacing it if you mess it up by disassembling.

    A quick check of my 03 service manual shows A and B as the leads for the motor which are black and purple. C which is brown is a flange ground that goes back to the blower control module.

    The blower motor controll processor (the name for the blower control module) is held on by a screw at the top of the box. There's nothing else in front of it.

    Is your HVAC the dual temp with digital readout?

    The manual system may be different.

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  • soonerdewsoonerdew Posts: 21
    I drove the car to work in the morning, on highways, and the fan was working; got in the car that afternoon, and it wasn't. Was in the driveway when I changed a fuse, which was by my observation wasn't blown, but I replaced it anyway. Started car, no fan immediately, then after perhaps 30 seconds, the fan ran. The fan started with the car on two successive restarts, again sitting on the driveway (no bumps), then on a third restart was dead again.

    That's led me to pulling the fan out, and trying to get the module out. The control system is the integrated electronic panel with digital display.
  • soonerdewsoonerdew Posts: 21
    I have discussed my symptoms with a tech from a dealer that formerly sold and serviced Buicks, and he has strongly suggested that I replace the blower motor rather than the control module. He agreed with the likelihood that the motor has developed a "dead spot" similar to that which arises in some starter solenoids. He obviously cannot guarantee that is the problem, but he felt that was a much higher probability than the control module.

    I will be looking at an aftermarket blower, because the local GM dealer wants $300 for a replacement. I think not.
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