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2002 TB AC compressor problems

19 messages,  Last post on Jan 16, 2009 at 4:50 PM

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#11 of 19 2002 Trailblazer A/C problems by txtrailblazer Sep 11, 2007 (7:48 pm)
I have an '02 TB. I have 103,000 miles on it. I've had the same problem many of you have...a/c blows hot/cold/hot/cold and won't get cold until to drive it for a few miles. (I live in Texas!) I've had this problem for several years. My mechanic (a very good one) and the dealership couldn't find the problem in years past. Finally my mechanic was able to duplicate the problem, with the help of noise from the fan clicking. He suggested per GM's recommendation to replace the A/C actuator. It was replaced just 2 weeks ago. (Be prepared...GM initially posted the replacement to take only 3-4 hours....it's actually 8-10 hours! The soon changed their recommended replacement time to 8-10 hours after my mechanic lit into them about it.) I thought this eleviated the problem, but it's back. Does anyone have an answer to this problem?? For the most part the TB is a good vehicle, but there are other major problems that shouldn't have happened (ball joint replacement, replaced the fuel injectors...pricy). P.S. GM are you reading this too???? Please let me know what the answer is to my A/C problem. Replies to this message: tblazed (Sep 12, 2007 6:07 am)
#12 of 19 Re: 2002 Trailblazer A/C problems [txtrailblazer] by tblazed Sep 12, 2007 (6:07 am)
Replying to: txtrailblazer (Sep 11, 2007 7:48 pm) The intermittent cooling until you get moving is most likely the fan clutch. There was a TSB issued two years ago about that.   #04-01-38-019A - (Jun 7, 2005) Intermittent Slow to Cool HVAC Performance Concerns in High Ambient Temperatures and/or High Humidity Conditions After Start Up, Especially at Low Engine Speeds (Install New Engine Cooling Fan Clutch)   The "Actuator" you had replaced, was that the mode door actuator? That takes less than 1 hour to replace!   TSB #05-01-38-001A - (04/08/2005)Subject: Info - Essential Tool for HVAC Mode Door Actuator Replacement   Labor Operation D1808 Actuator And/Or Motor, Electric-Mode Valve-Replace 0.6 hr.
#13 of 19 TB AC confused by morra Nov 30, 2007 (1:14 pm)
I have a 2002 TB about 100,00 miles I purchased the vehicle w/46,000 miles on it. The AC worked perfect but then within 1 1/2 year the AC started acting up. I had taken the TB to a mechanic to check the coolant, refridgerant, everything. The mechanic said everything was leveled correctly & did not know why it was not blowing out the air I wanted. The AC display will be 75 but once I stop a stop light it will go down to -18 plus & then once I drive again for about 15 mins it will go back up to the temp I wanted, by that time I am home. Would anyone know why the temp display & the AC does this? Replies to this message: burdawg (Nov 30, 2007 2:57 pm) darlanikki (Jul 25, 2008 1:16 pm) gkliegibel (Aug 16, 2008 5:42 pm) darlanikki (Oct 13, 2008 9:53 am)
#14 of 19 Re: TB AC confused [morra] by burdawg Nov 30, 2007 (2:57 pm)
Replying to: morra (Nov 30, 2007 1:14 pm) What temp display are you talking about? The one on the rear view mirror? Or on the climate control?
#15 of 19 Re: TB AC confused [morra] by darlanikki Jul 25, 2008 (1:16 pm)
Replying to: morra (Nov 30, 2007 1:14 pm) I have an 02 trailblazer LTZ. My a/c has worked fine until now. Like you, it suddenly started giving me ridiculous readings for outside temps. I got -17 one time and the 45 another, when actually, it was 95 deg. outside. When this incorrect temp was displayed for outside, it would affect the a/c temp inside. I bought it to dealership and have left it for 3 days. They changed the control unit and it still did the same thing. If I stopped in traffic it would show outside temp going down and when I would speed up , it would go back to normal and start cooling again. So, they decided to change the outside sensors and wiring. Still , same thing. They have been in touch with GM and we won't even go into the stupid ideas they came up with, like "it's doing like it is suppose to do". ha. Anyway, my last call a while ago, the service manage has told me it was the compressor. When they connected their diagnostic to it, they said it went crazy. Supposedly, when it gets hot, it builds up head pressure(whatever that meant) and goes wacky. And when you speed up there is more air hitting the condenser which causes it to cool off and work ok . Now, they are planning on putting a new compressor on it and we will see if that works. Anyone else come up with anything. LMK, Replies to this message: gkliegibel (Aug 16, 2008 5:42 pm) darlanikki (Oct 13, 2008 9:53 am)
#16 of 19 Re: TB AC confused [darlanikki] by gkliegibel Aug 16, 2008 (5:42 pm)
Replying to: darlanikki (Jul 25, 2008 1:16 pm) Did the new compressor fix the outside temp reading? My '02 TB LTZ just started doing exactly what you stated in your message. Thank you for your input. gl Replies to this message: darlanikki (Oct 13, 2008 9:53 am)
#17 of 19 Re: TB AC confused [gkliegibel] by darlanikki Oct 13, 2008 (9:53 am)
Replying to: gkliegibel (Aug 16, 2008 5:42 pm) sorry, this has taken me a while to get back with you, I've been in the hospital, while my Trailblazer stayed in the dealership. No, the compressor did not work. They also changed the complete wiring harness, put in another new control unit(in case the other new one was defective), changed the dryer, filters, and outside temp sensor. None of these have fixed the problem. It may work fine for a few days, but then, I get that 50 deg reading outside and the heater starts blowing , and that is when it is 90 outside. I also noticed when I picked it up last week when it was cool in the morning, the heater will only blow hot when it is set to 90. Anything lower and the a/c blows. So, I am going back to dealer with it this afternoon. Has anyone else out there got a solution to this because my dealership is baffled.
#18 of 19 02 TB LTZ climate control by darlanikki Dec 17, 2008 (5:40 pm)
ok, I have had my TB at the dealership for about 5 1/2 months. The service mgr tells me he has followed all instructions from GM tech support, including suggestions from a field engineer. It still doesn't work. I have had a Customer service from GM working with me for all these months. Very nice and understanding. Field engineer has suggested bringing TB to another dealership in different town. Larger service dept there. This will be my next step. The dealership that has had it all these months seems to have exhausted their ideas and abilities. Recently, I have explained that I found an article about the outside temp displayed as -17 or 48 , when it actually was a hot 98 outside. And of course, the heater would kick in. The article suggested the inside sensor had some sort of short and would confuse the control unit and it would get incorrect outside temp readings and react accordingly. I sent this article to the dealership and their reply was that the sensors tested ok. Well, a lot of what they tested showed incorrect readings so they replaced it only to find out that wasn't the problem. So, I'm thinking that I just don't trust their readings when they tell me it test ok. They have replaced just about everything and no success. I am hoping this new dealership will be able to find the problem. I have been without my car for months. If you have this problem or similar , I suggest you tell them that when they "think" they have found the problem and it is working, to keep it at least 7 days and drive it everyday. It has worked well for as little as 1 day all the way to day 7 before it messed up again. It has never worked more than the 7 days without going crazy again. Please anyone with same problem and got it repaired where it is working again, let me know what was done?
#19 of 19 02 TB LTZ Climate Control by darlanikki Jan 16, 2009 (4:50 pm)
Here's an update: I did bring the TB to the other dealership as suggested by GM and the field engineer. They have had it a couple of weeks. First they said they could not duplicate the problem, but after I explained they needed to run it and get it warmed up, they were able to duplicate it. They called and told me they had it fixed. Guess what? They changed the outside temp sensors and wiring (see Post 15) Ok, I will pick it up tomorrow, but this feels like De ja vu'. I feel like we are starting over again but with a different dealership. Of course, the weather is cooler now that we are in January. But we do get a few warm days every now and then, so maybe I will be able to test the A/C then. They have told me perhaps the first sensor that was replaced was defective. OK, let's see-----------

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