My driver's side ac quick working (blows hot air) but my passenger side works fine. It happened right after I tightened my positive battery terminal which was lose. Anybody have any suggestions.
Thanks

 

I had the same problem and it was the temperaure not adjusted lower enough.Turn your temp. doTurn the cold or warmer adjustment to colder and see if the cold air doesn't come out on the drivers side.
this wroked for me.

 

let me know when you find the cure...my passenger side blows hot air.

thanks, charlie

 

i tried the temp ****, kinda think it is electrical/fuse something like that

 

small vac line on back of int., check to make sure it didntnt fall off, and make sure your fluid is full.

 

That is a common sign of low refrigerant in these cars, especially if there are no error codes.

 

Check your battery for leaks. If there is acid underneath it has eaten away your vacuum line to A/C controls. A common problem with some front terminal batteries. Some of the lines are in the wire bundles and look just like black wires. Use lots of baking soda to neutralize the acid before you go to work replacing lines.

 

There is some miss information going on here, so i would like to get it right. The vacuum line provides vacuum to the doors that control the air flow to the different levels (Upper, Lower, Both or Defrost ducts). If you select the top or lower ducts and the air flow does not change or all the air comes out of the defrost duct (that the default duct setting) then their is a possible problem with the vacuum supply to the HVAC unit. The vacuum comes from the back of the intake manifold. It runs down to the passengers fender well to a vacuum reservoir. from there it goes to the HVAC unit and on early C5's the AIR pump.

Yes, the battery can leak and cause the vacuum lines to evaporate and cause significant damage to your wiring harnesses and PCM. Its always a good thing to check your battery for leakage and if you still have the OEM Delco, get rid of that thing!!

If you can select different duct levels, your vacuum lines are fine.

There are two controllers in the HVAC system that control temperature. They are on the left and right side of the HVAC unit under the dash. They are monitored by the OBD II system and if the actuators are not working correctly, you will not be able to change the temperature on one side or both sides and you should get codes. Recommend that you check the codes. If you have codes, try clearing them and see if that allows the actuator to function again. There are a few modules that if DTC codes are set, the module will not function until the codes are cleared. The actuators are known to malfunction and sometimes the operating shaft cracks and will no longer turn the door shaft.

Before you get too deep in troubleshooting and replacing parts, examine the actuators and make sure that they are moving the shaft so that the temperature can be changed. If it isn't moving, that is most likely your problem.

There are also two fuses that can be pulled to reset the HVAC module and clear all the faults. for the life of me i cant remember what they are right now. (I'm at work and don't have all my manuals )

Bill

 

I did have the code BO3661 i think it was meaning that the left actuator was bad BUT i took it to the dealer and a vac and recharge of my ac and it was very cold after that. That was last year and now its doing the same thing. I have a leak in the system it seems.

 

Before you get to much further, try pulling fuses #18 and #27 in the instrument pannel electrical center and see if the acutators will reset and work again. If that doesnt help. then take it to the dealer.

BC

 

The above mentioned is all correct The H.V.A.C. module and B.C.M. are both Class-2 devices and are the only modules responsible for code setting or H.V.A.C. operation.I assume you did check for codes? if none are present, there still could be a concern with the control head or right temp actuator, but any problems with the actuators or any malfunction of the H.V.A.C. system should set a code in memory as history or current. Yes, the actuators fail quite often, especially on 97-01 that I have found, Also I didn't see what year yours was, but there is a Bulletin regarding the exact concern you have. Try to disconnect the negative cable, take the cable and momentarily touch it to the positive post on battery, re connect battery. If problem persists, to diagnose correctly, you really need a Tech-2 to check door position. I have found that (referring to the bulletin) installing a 02' or later control head rectifies concern, due to you not having this problem prior to battery disconnect, if it was present before, then most likely the right temp actuator is failed. I am not at work today, but if you like, I can get you a copy of the bulletin.
Also, as someone else posted, low refrigerent charge WILL NOT cause the temps to vary from one side or the other.