Last post on Sep 03, 2012 at 7:06 AM
You are in the Chevrolet TrailBlazer
What is this discussion about?
Chevrolet TrailBlazer, Chevrolet TrailBlazer EXT, Heating / Cooling, SUV
#14 of 23 Re: TB AC confused [morra]
Nov 30, 2007 (2:57 pm)
What temp display are you talking about? The one on the rear view mirror? Or on the climate control?
#15 of 23 Re: TB AC confused [morra]
Jul 25, 2008 (1:16 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,
#16 of 23 Re: TB AC confused [darlanikki]
Aug 16, 2008 (5:42 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
#17 of 23 Re: TB AC confused [gkliegibel]
Oct 13, 2008 (9:53 am)
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 23 02 TB LTZ climate control
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 23 02 TB LTZ Climate Control
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-----------
#20 of 23 Re: 02 TB LTZ Climate Control [darlanikki]
Aug 15, 2010 (10:22 pm)
i have a tb 2002 and i need a compressor. does that effect other parts of my car or just the ac? thanx for the help
#21 of 23 Re: 02 TB LTZ Climate Control [darlanikki]
Jun 30, 2011 (8:58 pm)
Did the sensor and wiring fix your AC issue? I'm having the exact same problem with my 02 trailblazer. I've spent almost $400 on A/C service and new dash face. I was considering replacing the compressor myself, as that was my mechanic's next suggestion. I hate to tear into it though if that's not the problem. When my car warms up, I can see the compressor clutch stop.
#22 of 23 Re: Loud whining noise! [degonza]
Aug 04, 2012 (9:47 am)
My 03 TB Ext Lt does the same thing, it does appear to be a noisy power steering unit.
#23 of 23 Re: TB AC confused [darlanikki]
Sep 03, 2012 (7:06 am)
I had same problem, there is a temp. sensor just in front of the radiator that will send temp to climate control, replaced mine and have had no more problems. ( about $8. at chevy dealer)