Re: 02 Trailblazer A/C Problems

I would try a different dealership before all else. Perhaps the dealership you are working with now isn't doing anything at all to address the problem.
All automotive A/C quits sooner or later in my experience--and when it does it's hardly time to lemon law the vehicle. Just time to forget you ever had it and put the windows down.
William
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On Thu, 17 Jul 2003 02:18:55 GMT, "William R. Walsh"

Even on a new vehicle that GM should be fixing FREE anyway? I think not. The OP should take your advice to try another dealer, but not the advice about not lemon-lawing the vehicle. GM isn't making an honest attempt to fix the problem, so the lemon law may not even hold up. Most places require that the dealer make an honest attempt to repair the vehicle in the 2 tries they get...

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I am well aware A/C systems will quit over time, but what you fail to understand is this vehicle is a 2002 model year with less than 20,000 miles. It should not be that way.
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_________________________________
impossible to find the problem when it wont do it. What exactly does it do/not do? Wont blow at all? Blows but its hot? Does it seem to do it after driving for a while or just when you first fire it up in the AM? , ect.?
I bet if you can be very specific you might be able to get them to do something. If not I would simply call another dealer. If you get to talk to a good service advisor they will help you out and try to duplicate or at least have the tech try something acording to your discription of the problem.
Let us know here what it does then maybe we can give you an idea what it might be. Then you will be armed with some knowledge to take with you. You just might be able to get them to change a part anyway, they will get paid for it even if its turns out not to be the problem.

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I have a sort of similar situation with my '02 TB. When you first turn on the A/C, it blows warm. Once you drive about 100 yds. it starts blowing cold, and stays cold. Kinda annoying, but not enough for me to bring it to the dealer. Oh yeah, I live in Houston, and we sorta "need" the A/C about 9 months of the year.
Tom S.
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Long post but here is a TSB for a possible problem
Air Conditioning (A/C) Inoperative/Intermittent, A/C Blows Warm Air (Replace A/C Low Pressure Cycling Switch) #03-01-39-007 - (05/29/2003) Air Conditioning (A/C) Inoperative/Intermittent, A/C Blows Warm Air (Replace A/C Low Pressure Cycling Switch)
2003 Cadillac Escalade, Escalade EXT, Escalade ESV
2002-2003 Chevrolet TrailBlazer, TrailBlazer EXT
2003 Chevrolet Avalanche, Silverado, Suburban, Tahoe
2002-2003 GMC Envoy, Envoy XL
2003 GMC Sierra, Yukon, Yukon XL
2002-2003 Oldsmobile Bravada
2003 HUMMER H2
Condition Some customers may comment that the A/C system is intermittently inoperative or blows warm air.
Cause An intermittent inoperative (open) A/C low pressure cycling switch may be the cause. This is an intermittent condition and temperatures may play a critical role if the vehicle is in the failed mode or operating as designed.
Correction Follow the diagnosis and service procedure below to correct this condition.
Park the vehicle inside or in the shade. Open the windows in order to ventilate the interior of the vehicle. If the A/C system was operating, allow the A/C system to equalize. Turn OFF the ignition. Open the hood and install fender covers.
Caution Avoid breathing the A/C Refrigerant 134a (R-134a) and the lubricant vapor or the mist. Exposure may irritate the eyes, nose, and throat. Work in a well ventilated area. In order to remove R-134a from the A/C system, use service equipment that is certified to meet the requirements of SAE J 2210 (R-134a recycling equipment). If an accidental system discharge occurs, ventilate the work area before continuing service. Additional health and safety information may be obtained from the refrigerant and lubricant manufacturers. For personal protection, goggles and gloves should be worn and a clean cloth wrapped around fittings, valves, and connections when doing work that includes opening the refrigerant system. If R-134a comes in contact with any part of the body severe frostbite and personal injury can result. The exposed area should be flushed immediately with cold water and prompt medical help should be obtained.
Notice R-134a is the only approved refrigerant for use in this vehicle. The use of any other refrigerant may result in poor system performance or component failure. To avoid system damage use only R-134a dedicated tools when servicing the A/C system. Use only Polyalkylene Glycol Synthetic Refrigerant Oil (PAG) for internal circulation through the R-134a A/C system and only 525 viscosity mineral oil on fitting threads and O-rings. If lubricants other than those specified are used, compressor failure and/or fitting seizure may result. R-12 refrigerant and R-134a refrigerant must never be mixed, even in the smallest of amounts, as they are incompatible with each other. If the refrigerants are mixed, compressor failure is likely to occur. Refer to the manufacturer instructions included with the service equipment before servicing.
Install the J 43600 ACR 2000 Air Conditioning Service Center.
Important The ambient temperature must be at least 16C (60F) . Do not induce additional air flow across the front of the vehicle during the test.
Record the ambient temperature displayed on the J 43600. Record readings of the low and high side STATIC pressures. The pressures should be within the specifications listed below. Above 16C (60F): 345 kPa (50 psi) Above 24C (75F): 483 kPa (70 psi) Above 33C (90F): 690 kPa (100 psi) If the static pressures are within specification, continue with Step 12. If the static pressures are NOT within specifications, refer to Leak Testing (SI Document ID# 1141201). Apply the parking brake. Place the transaxle/transmission in PARK. Start the engine. Turn on the A/C system. Inspect the A/C compressor to see if it is operating properly.
If the compressor is not operating as designed, tap on the low pressure cycling switch (2) with a small hand tool. The compressor should start operating correctly. If the compressor does not operate correctly after tapping on the low pressure cycling switch (2), disconnect the switch and jumper the lower pressure cycling switch connector with a fused jumper. If the compressor still does not operate properly, refer to HVAC Compressor Clutch Does Not Engage diagnostic in SI.
Important DO NOT USE A/C low pressure cycling switch, P/N 15035084 on the vehicles listed above.
If the compressor does operate correctly after tapping on the switch or jumping the low pressure cycling switch connector, replace the low pressure cycling switch (2), P/N 89040362. Refer to Air Conditioning (A/C) Low Pressure Switch Replacement in SI. Perform the Air Conditioning (A/C) System Performance Test in SI. Disconnect the J 43600 ACR 2000 Air Conditioning Service Center. Remove the fender covers and close the hood.
Josh
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OK I had the same problem with my trailblazer to when you turn on your car the AC doe not work but only warm air comes out. when you turn the engine off and on again then it works again? I think that is the problem you had. Well I took it to my deal there was a notices a while back to deal with that problem I can't remmber what they did but I think they told me was they had to reprogram the computer to fix that problem I knwo it was something simple once they did that my AC work just fine now so go back to the dealer and tell thyem thats there was a notice on it and tell them go look it up if they won't go to another dealer that will

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