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98 Malibu No fan speed 1,2 (Good 3,4,5) AC Cuts out

wjlaw on Tue May 25, 2004 11:13 AM User is offline

Year: 1998
Make: Chevy
Model: Malibu
Engine Size: 3.1L
Country of Origin: United States

Hi All. Wierd Problem. 98 Malibu... the fan speeds 1 and 2 do not turn on the fan. 3,4,5 do! 5's fuse (high speed) is just fine! AC Touch switch and light internittantly goes on off, turning on/off the compressor.

Have checked all fuses, swapped the mutli-pin plugs in the box under the hood (There were two... swapped with each other to see if the problem "moved"... same part number), checked other fuses... all no problem (In kick panels, fuse block).

Went to junk yard, picked up a "Control Unit" with Fan control, Temp control, AC & Defrost switch,etc.... eact replacement (Chevy Pary Number 22626483), popped it in... and PRESTO SAME EXACT PROBLEM. This tells me that I completely missed it!

Anyone have any thoughts? Since the AC switch (and light on switch) flashes on/off intermittantly, though problem would be in the controller coupled with the FAN SPEED switch, since turning to off turns off AC as well.

Still having problem. Collant presure within specs (Had Uncle Check that)... and AC switch eventually stays on, but drops off if you turn "up" the temperature to make it less cool, tends to turn off more.

Same problems with Internal air setting as well as external air setting. Also, tried chaning the Mix setting to up/low, defrost, etc.... All the same problem....

Wierd Huh... ANY THOUGHTS APPRECIATED!

Thanks. Bill

GM Tech on Tue May 25, 2004 3:20 PM User is offline

The master A/C switch is in the fan speed control switch- 2 brushes that need to be polished and bent tighter-- very common problem with this car- have done dozens ..........take apart switch and you will see the brushes are very poorly designed- this is what is making your a/c and a/c lite intermittent..

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

wjlaw on Wed May 26, 2004 3:33 PM User is offline

Thanks for the Info!

I'll take one of the dash units apart and do just that.

Anonymous on Thu June 10, 2004 10:46 PM User is offline

THERE WAS A RECALL ON THAT . MY MALIBU DID THE SAME THING AND THEY FIXED IT CAUSE OF A RECALL.

Anonymous on Mon June 14, 2004 11:28 PM User is offline

I'm seeing exactly the same thing on my '97 Malibu LS.
Multiple service attempts, including replacement of the panel, but no relief. The interesting problem is that I've noticed the problem seems to be worst when the car is hot. (It's not just my perception that the problem is worse when I'm cooking inside of my air-conditioned car.) I wonder if the contacts perform unusually badly when they're hot...

Any details on the recall?

BobM on Fri June 25, 2004 12:19 PM User is offline

Absolutely the correct information. Was a very easy 10 minute fix - I relubed the contacts with petroleum jelly after polishing and stretching the spring about 25%.

Would buy you many beers for the info, this is what the internet is all about for the consumer,

Thanks

GM Tech on Fri June 25, 2004 12:39 PM User is offline

Great to hear it-- have seen dozens.. sad that you went 30 days to fix it..........

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

Taxgeek on Wed July 07, 2004 9:18 PM User is offline

Man, I am glad I found this thread. If you thought 30 days was a long time, try 1 1/2 years! After the misery I had with my 99 Blazer, I vowed never to return to the local dealership.

I, too, have a 98 Malibu (must not have been thinking clearly in 98-99) with the faulty switch. It seems easy enough to repair, but my question is this: What area of the dash do I disassemble and how do I do it? Does the A/C control unit face plate come off, or do I need to remove the entire center dash cowling?

Thanks in advance,

Taxgeek

GM Tech on Wed July 07, 2004 9:58 PM User is offline

Pull off (snap out) the facia plate around control head (and ignition key ) then it exposes 4 7mm screws- that you remove- the slide out control head- unhook all electrical connections and vacuum connector- then disassemble left hand side master switch- where the brushes are found underneath- very simple- easy job - I get $30 to do it-- dealer wants $105 just for the control head....

-------------------------
The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

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