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2005 isuzu ascender
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I found this while searching on the NHTSA site:

Technical Service Bulletins Summary

Make: ISUZU
Model: ASCENDER
Year: 2005
Type: MULTIPURPOSE PASSENGER VEHICLE
Service Bulletin Number: 0512001
NHTSA Item Number: 10014796
Summary Description:
INTERMITTENT A/C PERFORMANCE CONCERNS IN HIGH AMBIENT TEMPERATURES AND OR HIGH HUMIDITY CONDITIONS ESPECIALLY AT LOW ENGINE SPEEDS. *EH

Jeff
 

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Same issue here in NJ

Same issue here guys with my 04 Trailblazer. It is 82 here in New Jersey and my air is blowing "OK". Not as cold as it should. Had it checked once. As you all have been told as well by your dealerships that everything checks OK. They placed the leak dye to be sure but do not see any issues.

My A/C starts off cool then seems to get cold for a few minutes (usually when I am on the way to the dealership again for them to see what is going on) and then it gets warmer.

I have been reading the GM bulliten everyone has refered to. It also states that even if they do this modification, it will only produce a 3% increase in performance. Not sure if it is even worth the effort.

I would like to hear from anyone that has had their dealership perform this fix to see if it realy improves the A/C or not.
 

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2004 chevy
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I am in on the 15th for that also, along with some other fixes.
 

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Goin in too

I have just scheduled my TB to go in this Sat. The issue is when they usually check it, it is early on in the day so it is very cold. To them it is "what do you mean it is not cold...it is ice cold now...nothing is wrong"

Just drove home from work, about 80 again with high humidity and it was cool...not that hand numbing cold we are looking for. If i check it again in an hour os so, it will blow ice cold.

I mentioned the bulletin when I called to make the appointment. I did get a "it takes a while for the A/C to get cold in hot weather" response from the tech when I spoke with him. I am not buying it though. In my Wife's Nissan Maxima, you can hang meat in there after a few minutes of the A/C running!

I will let all you know how I make out this time around at the dealership....

Stay Tuned Kiddies!
 

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A/C Update

Well all, came back from the dealership. I brought the bulliten with me as well to show the tech. They checked the software version on on my Trailblazer and sure enough it needed to be upgraded. As the tech was upgrading the software, we began to talk about this issue. He said that there are so many things that can cause this, it is really a "lets try this, lets try that". He felt that the softwate upgrade could help. However he did say that I shouldn't expect it to get cold enough to "hang meat" in the truck during very high teperature days. High humidity makes it worse.

After the upgrade, it did seem like the A/C got colder a bit faster at idle ( we sat in the car w/ a thermostat in the vent to monitor the temp as it got colder) It got a bit below 60. He said it should go down a dew more degrees when driving (with air going through the radiator).

So, there it is..I will keep an eye on it to see if this makes any difference. They also did mention that they have been experiencing some bad compressor switches with the Trailblazers as well (could be the issue if this software upgrade doesn't help)

Also they did thank me for alerting them about the bulliten (that was a first from any dealership I have ever been to!) Hope this helps anyone else that is going through the same issue.
 

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I'm going to have my EXT V-8 looked at. I noticed poor AC performance at idle, especially in the back. I have also noticed that it works fine sitting still if I rev the engine to 1500rpm. It is in the 90s and very dry here. Temp gage goes up to about 2 marks past half way before it drops.

I noticed this after I spent 45 minutes in the vehicle waiting for my wife 2x.

I keep the temperture around 70 to stay comfortable. 70 in my Caddy would freeze something off your body once it cools down the interior.
 

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2004 chevy trailblazer_lt
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i rarely ever use my A/C, but now i better go test it out. It seems a lot of people have problems with it.
 

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2004 chevy trailblazer_ls
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lisicki said:
Well all, came back from the dealership. I brought the bulliten with me as well to show the tech. They checked the software version on on my Trailblazer and sure enough it needed to be upgraded. As the tech was upgrading the software, we began to talk about this issue. He said that there are so many things that can cause this, it is really a "lets try this, lets try that". He felt that the softwate upgrade could help. However he did say that I shouldn't expect it to get cold enough to "hang meat" in the truck during very high teperature days. High humidity makes it worse.

After the upgrade, it did seem like the A/C got colder a bit faster at idle ( we sat in the car w/ a thermostat in the vent to monitor the temp as it got colder) It got a bit below 60. He said it should go down a dew more degrees when driving (with air going through the radiator).

So, there it is..I will keep an eye on it to see if this makes any difference. They also did mention that they have been experiencing some bad compressor switches with the Trailblazers as well (could be the issue if this software upgrade doesn't help)

Also they did thank me for alerting them about the bulliten (that was a first from any dealership I have ever been to!) Hope this helps anyone else that is going through the same issue.

Interesting. May have to look into this. By the way, what year is your vehicle?
 

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The wife and I were in Las Vegas the other day 114 degrees, in stop & go traffic A/C just didn't work well. As soon as we got up on the freeway the A/C worked great.
As a person who has an EPA Type I & 2 HAVC Certification I can share with you that R134A is not a good refrigerant in hot surroundings. this is why many manufactures use both mechanical & electric fans trying to keep as much air flowing over the condenser to cool it.

Just after 134A came out in refrigerators I got a warranty call from G.E. a lady had bought a band new upright freezer and it wasn't cooling. So I loaded it up took it back to the shop plugged it in and sitting in the middle of the shop it pulled down to -10 degrees in short order, as I was thinking about where it was located in the customers garage I realized that it was stuffed in a hole where her old R-12 freezer was, & GE had a warning label that said it needed to be in an open area. I took it back the next day and told her she couldn't put it in that hole, so she found another place to put it and that was the end of her problem and mine.
One thing you can do is set up a mister in front of the condenser use a windsheild washer pump to mist at stops. that will drop the temp with cold water about 15 degrees
 

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2007 chevy trailblazer_ss_1ss
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Discussion Starter #51
Hmmmm: Deep Freezer + Trailblazer = No A/C problems... :laugh:

Seriously, thank you for the suggestion, but on a $30,000 truck, the last thing I want to hear from my dealer is that my A/C is at its best and can't cool when its hot out. :duh:

I am sure that there is somthing that my dealer can do about this problem, and I will be a frequent customer/complainer until like jauto98 said, they try everything!!
 

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My Trailblazer

My Trailblazer is a 2004. This bulletin addresses I believe 2002 - 2004. The 2005 models should already have this software upgrade.

I agree...for the price of this trick, you should be able to hang meat in it with the A/C. I am sure if you keep on them, they will keep on trying to get it right. However, once the warranty is up, this might get a bit expensive....
 

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I agree fully, Thank the government for this. In fact after they set all the dates to pull R-12 they realized that they made a mistake and we the tax payers had to fork over millions if not billions to change out all the governments R-12 drinking fountains refrigerator in lunch rooms etc. Then one day I went to work and the owner of the shop I worked for, and who I worked with at a government contractor base, handed me a bulletin from Dupont the maker of R134A, that told us to wear respirators, and chemical suits when working with R134A, We looked at each other and said, this is going to be used around food we eat and cool us in our cars, what will happen when leaks occur? For you young guys & gals don't be surprised someday when problems occur do to exposer to R134A.
 

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2007 chevy trailblazer_ss_1ss
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Discussion Starter #54
thecarbonman said:
...........handed me a bulletin from Dupont the maker of R134A, that told us to wear respirators, and chemical suits when working with R134A..............
Oh, thats comforting! :mad:
 

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2005 chevy trailblazer_lt
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yea that makes me feel great considering i used to recharge my last car myself,

shay
 

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2005 gmc envoy_denali
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Dave said:
I'm going to have my EXT V-8 looked at. I noticed poor AC performance at idle, especially in the back. I have also noticed that it works fine sitting still if I rev the engine to 1500rpm. It is in the 90s and very dry here. Temp gage goes up to about 2 marks past half way before it drops.

I noticed this after I spent 45 minutes in the vehicle waiting for my wife 2x.

I keep the temperture around 70 to stay comfortable. 70 in my Caddy would freeze something off your body once it cools down the interior.
Dave, I think it was on Edmunds where I read that GM has some kind of new part to help fix the EXT/XT problem with not enough heat in the back. Maybe this part also helps the AC
Bill
 

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My wife's TB doesn't blow hot at an idle it just isn't as cold as when driving. Yea, it was the beginning of me retiring, one year later, my dear friend and work partner died of cancer at the age of 47. So far I'm blessed I'm 55 no cancer.
 

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I got my TB back from the dealer, having them look at the AC under the latest TSB mentioned here, 04-01-38-19A. The service order says they replaced a Clutch part #15293048. I can honestly say now that I've had my truck back for a few weeks and we've had some serious scortchers; this has made a HUGE improvement! The AC kicks up right away and stays cold at lights and at idle. I notice that I don't need to run the fan speed as high as I used to and I like the interior COLD.

A side note, I've noticed substantially more condensation dripping from the bottom of my truck after it's been parked. This to me is a sign that it's not just my perception. Something under the hood is colder to generate that much more condensation. (Unless they cleared a blocked drain somewhere :laugh: ) I also notice additional fan noise at low speeds sometimes, which is consistent the story that there wasn't sufficient air flow over the condenser.
 

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2006 chevy trailblazer_ss_lt
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I've read alot about the fan clutch being crap, I have an '02 that I just got this year and I'm considering buying one and swapping it out just to be safe. Wonder if I can do it myself?
 

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year

black03tb said:
I got my TB back from the dealer, having them look at the AC under the latest TSB mentioned here, 04-01-38-19A. The service order says they replaced a Clutch part #15293048. I can honestly say now that I've had my truck back for a few weeks and we've had some serious scortchers; this has made a HUGE improvement! The AC kicks up right away and stays cold at lights and at idle. I notice that I don't need to run the fan speed as high as I used to and I like the interior COLD.

A side note, I've noticed substantially more condensation dripping from the bottom of my truck after it's been parked. This to me is a sign that it's not just my perception. Something under the hood is colder to generate that much more condensation. (Unless they cleared a blocked drain somewhere :laugh: ) I also notice additional fan noise at low speeds sometimes, which is consistent the story that there wasn't sufficient air flow over the condenser.

What year TB do you have?
 
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