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Chevrolet Malibu Climate Control/AC Issues

124

Comments

  • darek99darek99 Posts: 1
    My 2000 Malibu is making metallic grinding noise. It is related to air conditioning.
    It happens when AC is off!!!!!. If I turn AC on the noise stops. Otherwise AC works good, cools nicely. What could be causing that? :confuse:
  • gonogogonogo Posts: 874
    Most likely clutch bearing, when the A/C is engaged the bearing no longer rotates. A good A/C shop will replace just the bearing. Most just in stall a new clutch or worse a new compressor, big bucks.
  • duffin1duffin1 Posts: 1
    Howdy all

    I just bought a 2003 Malibu and have noticed that the interior fan for the heater and A/C is always on.
    I've looked for a way to shut the fan off and cannot
    find a way to stop it from blowing air into the cabin. Any suggestions

    Cheers
    Duffin
  • aspen2aspen2 Posts: 3
    I found that you could access and clean the contracts on the board without taking the controller unit apart. Once the unit is removed from the dash, remove the button from the from of the selector switch and just unscrew the two screws on the back of the controller that are holding in the selector switch. When you remove the switch from the back of the controller you can see the area of the printed circuit board that has the worn contacts (they are circular in shape on the board). Clean with alcohol, apply some graphite to the worn contacts on the board and put the selector switch back in.
  • aspen2aspen2 Posts: 3
    I found that you could access and clean the contracts on the controller board without taking the controller unit apart. Once the unit is removed from the dash (remove bezels around ignition key switch and bezel around radio and a/c controller. Both bezels pop out without removing any fastners_, remove the button from the front of the selector switch and just unscrew the two screws on the back of the controller that are holding in the selector switch. When you remove the switch from the back of the controller you can see the area of the printed circuit board that has the worn contacts (they are circular in shape on the board). Clean with alcohol, apply some graphite to the worn contacts (can use a #2 pencil) on the board and put the selector switch back in.
  • aspen2aspen2 Posts: 3
    I also had (and will probably have again) the problem with the ac control module on my 2001 malibu. I have had success fixing it with pencil graphite and some cleaning alcohol. Total first time repair was 30 minutes. Can probably do the next one in 20 or less. Total repair requires you to remove two small bolts holding in the controller unit and two torx screws holding the mode selector switch in the controller unit.

    My problem was that the contacts on the controller circuit board for the mode selector (floor, dash, defrost selector) were worn. I found that you could access and clean the contacts on the controller board without taking the controller unit totally apart as suggested in the "A/C Controllers are Repairable" article cited in an earlier post.

    First you must remove the controller unit from the dash. To do this remove the plastic bezel around the ignition key switch and the bezel around the radio and a/c controller. Both bezels pop out without removing any fastners. You may need to put the shifter into 1st to get space to remove the larger bezel. Once removed, you can move the bezel off to the side or unclip the cigarette lighter and free the bezel completely. Gentlely unclip the four connectors (3 electrical, 1 vacuum) from the back of the controller. Don't force anything. You can now take the unit out of the car and work on it in comfort.

    Remove the button from the front of the mode selector switch and unscrew the two torx screws on the back of the controller that are holding in the selector switch. When you remove the switch from the back of the controller you can see the area of the printed circuit board that has the worn contacts (they are circular in shape on the board). Clean with alcohol, apply some graphite to the worn contacts (can use a #2 pencil) on the board and put the selector switch back in. I also bent the two copper connectors on the switch out a small amount to ensure that they make good contact with the circuit board when the selector mode is turned.
  • rvothrvoth Posts: 147
    My 2005 had a musty smell coming from the ducts, for the last two years, this was very noticeable after the a/c was used. GM applied a fremfresh conditioner into the the evaporator to get rid of the mold/mildew smell.$230 later the problem was gone. A/C are not covered under warranty says GM canada.
  • You guys helped greatly! Thanks!

    The Torx driver needed is sized TX15.

    I used a quick drying electrical component cleaner that I purchased from an Autozone.

    I'll mention the wavy washer and the plastic block with the copper contact points.
    Both of those are revealed when the harnesses are unscrewed from the back of the unit. Don't lose them, and don't forget to replace them when you reassemble the unit.
    I also cleaned the contact points on that plastic block, just in case.
    I'll also mention that removing the control knobs was easy with a pair of pliers. I used a piece of paper to protect the plastic of the knob from the pliers.

    Other than that, the information in earlier messages and the AC_ControllersAreRepairable is all you need.

    The particular a/c controller unit I fixed is the 4th unit I've had in my 2003 Malibu. The first one lasted a couple of years. The three subsequent were all warranty replacements of the previous one. I figured, with a warranty like that, what's the harm of voiding it? My a/c controller works now, and I thank you.

    Vexed owners of a strangely behaving a/c controller, go forth and fix it!
  • tootal2tootal2 Posts: 13
    Is there a easy way to fix the intermittent ac problem on the 99
    Malibu? This is the worst car i have ever owned:(

    thanks
  • tootal2tootal2 Posts: 13
    will this fix the intermittent problem with my chevy?
    http://www.conquestauto.com/servlet/the-965/97-98-99-00/Detail

    If this works the next thing i need to fix is fan speeds 1 and 2:(
  • gonogogonogo Posts: 874
    That says dealer item, so it will break just like the original. If you google there is a fix for free, if you are handy with tools.
  • tootal2tootal2 Posts: 13
    I got the new controls installed. Now how do i fix fan speeds 1 and 2?

    also is there anyway i can get the front brake pads to last more then year? I wish gm would test everything in the car before they sell them.
  • gonogogonogo Posts: 874
    Replace the motor resistor, local purchase.
    Install good rotors, not Chinese, and good pads.
  • Is there a a/c filter in the glove compartment that needs to be changed and how would I go about it? :confuse:
  • Thanks for all the help guys
  • paopao Posts: 1,867
    in the 04 malibu maxx..there isnt a filter.......but you can put one in..you have to remove the glovebox and do a slight modification.....the saturn ion filter will fit
  • I am sorry Pao I forgot to specify that my car is a Malibu LS...Thanks for the help...I really appreciate it! ;)
  • gifthorsegifthorse Posts: 1
    :shades: Thanks for the info. I friend gave me his 1998 malibu. He was tired of the intermittent AC, bad radio reception, drive window inop and overheating. Found the radio fix on another post (Antenna cable under passenger carpet) The overheating was air in the cooling system and I used your post to resolve the AC issue. Great job and now I'm driving a very serviceable FREE 98 w/ 118K. Sweet. :)
  • navylife78navylife78 Posts: 1
    I own a 98 Malibu, and had problems with the A/C light flickering on and off intermittently. I thought the worst initially, but discovered an easy, easy, easy fix! All one has to do is clean the contacts behind the knobs/controls. That's right! Pull the knobs off, pull the cover plate off, and clean the contacts with alcohol and mild abrasive (i used the end of a screwdriver, gently).

    The problem is fixed! The problem may resurface in 3-4 years, as new rust/corrosion forms on the contacts, but it is so easy to fix again! No need to replace the control unit.
  • globe199globe199 Posts: 6
    Since my original posting(s) in 2005, I've fixed the A/C module twice, once in each 2006 and again in 2007. The problem comes back, I'm afraid. I fully expect to be pulling the module again this year.

    Here's what I was thinking this time though. Each time I take the controller apart, I become more and more skeptical that the problem lies deep inside the unit. There is NEVER any dust or dirt, and the contacts are basically in the same condition I left them.

    I'm wondering it the simple act of disconnecting the unit from the car's 12v power is enough to "fix" the problem. That is, de-powering the unit maybe causes a reset in its circuits. If you could somehow get at the unit from behind and disconnect just the power, maybe you wouldn't have to go to the hassle of removing it entirely.

    Any thoughts?
  • gonogogonogo Posts: 874
    Find which fuse powers it and pull that.
  • Thanks for the tip on the A/C problem, have had it for years, was thinking about buying a new switch module. I took it apart and in 10 minutes all was cleared up.
    :)
  • i have an 01 malibu that the hvac system just stopped working i have checked all the fuses and relays i have also replaced the inside hvac control module and it worked for a few min. and then it quit again does anyone out there have any ideas where i should go from here??
  • timmy6timmy6 Posts: 1
    No, I tried that and even after a couple hours of no juice when reconnected it still kept switching back to external air. When I took the glovebox out I noticed that these switches operate a door that just rolls shut to circulate external air and opens for internal. Would there be any issue with just locking the door in an open position? If I want outside air the windows still work. :)
  • meethosmeethos Posts: 4
    I have similar issues to others with the AC working at times, recirculate changing back to fresh air by itself, Now, none of it works, rear defrost does not come on, AC does not work either and recirculated air does not work. I tried the fix but it did not work.....not sure where to go from here.

    Also for a while, the AC was always on; even when the blower was in the off position
  • epolandepoland Posts: 1
    Oh my gosh! I have this same exact problem. I talked with someone at a chevy dealer today and they said it was something in the "computer" behind the buttons. They said the part I'd need would cost around $300.00. Clearly, I do not want to pay that. I'd like to take the thing off like suggested in previous posts but I cannot figure out how to do that. The buttons themselves don't just pop out and I have no idea how to actually take the whole thing off. For the last year the ac button light was always ON as well as the light on the button for air being pulled from outside. My defrost won't turn on. Now the AC won't turn on. I can't switch it to circulating air. The AC light was always on even if the vent was turned to off. What do I do???

    forgot to add that I have a 2004 malibu classic
  • redirishredirish Posts: 2
    i have a 2004 malibu the rear deforst does not work and the ac lite does not come on or the ac ??? can you help thanks :confuse:
  • redirishredirish Posts: 2
    was you able to fix it ?
  • meethosmeethos Posts: 4
    Woo Hoo.....was finally able to fix mine for the time being. I found a used unit on Ebay($30 compared to $300); swapped out the climate control unit and it started working again.
  • meethosmeethos Posts: 4
    very easy to do, only took me 30 min the first time I took it off. First you start off by pulling the black trim(this is what covers the climate control unit, radio, ignition cigarette lighter) away from the dash board; I just used my fingers. Then I had to put the key in the igniton so I could move the gear shift back(did not have to start the car to do this) so I could completely remove the trim piece; I disconnected the wiring harness from the cigarette lighter. From there you will see two bolts that hold the unit in place, I just used a 7 mm socket to undo the bolts and the unit just came off, there will be four connections on the back of the unit, just make note of how the vaccum hoses are connected. Then follow the instructions below to disassemble the control unit.

    http://www.imcool.com/articles/aircondition/AC_ControllersAreRepairable.pdf
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