A. C. prob? - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 12 (permalink) Old 06-25-2007, 03:34 AM Thread Starter
 
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A. C. prob?

Not sure if there are any AC gurus out there. Troday my 2003 LB7 was at idle for about 20 min. and it was blowing really warm not hot, but warm. It got better when I started driving but it was not great. The thing was turned up full blast but it was not very impressive. Granted it was about 90 degrees in FL today. I have been noticing a trend with this hot air latley. anybody have any ideas or comments. LT 3 trim all digital. It just seemed that it would blow colder.:shrug:
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post #2 of 12 (permalink) Old 06-25-2007, 03:47 AM
 
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how many miles do u have on the truck
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post #3 of 12 (permalink) Old 06-25-2007, 03:51 AM
 
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i would guess , the condenser in front of the radiator is getting heat soaked from the inter cooler and the rad causeing the effency of the ac to go down till it get s cooled down a lil from the truck moving and the air passing buy it , i do know killer bee has recorded 220 deg iat temps on the dmax at idle sitting still
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post #4 of 12 (permalink) Old 06-25-2007, 12:56 PM
 
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Gm had a problem with then if the temp was 90 +. Has that been addresses? If so, It might be low on refrigerant.
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post #5 of 12 (permalink) Old 06-25-2007, 02:59 PM Thread Starter
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the truck has 51000k
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post #6 of 12 (permalink) Old 06-27-2007, 01:39 PM
 
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Do a visual on all hoses, unions, and components. If you see any oil residue on them, unless you can verify another source, you most likely have a refrigerant leak.
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post #7 of 12 (permalink) Old 06-28-2007, 01:34 PM
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either refrigerant is low, or:

is it possible you are getting heat past the heater core due to a malfunctioning baffle?

Michael
Vehicle Systems Engineer/Professional Tuner
04.5 GMC 2500HD SRW LLY

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post #8 of 12 (permalink) Old 06-28-2007, 04:48 PM
 
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GM had an updated Accumulator and hose for these. My truck would hardly blow cool after an hour of driving before, now it works great.
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post #9 of 12 (permalink) Old 06-28-2007, 09:07 PM Thread Starter
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sounds like my truck. Should i contact the dealer with this info.
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post #10 of 12 (permalink) Old 06-28-2007, 09:32 PM
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Like Brandon said, there is a TSB on the accumulator etc, the dealer should be able to look it up. Not sure if it applies to 03's.

I had it done, and it made a big diff. But it sounds like yours is slowing down, so I don't know.

Michael
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04.5 GMC 2500HD SRW LLY

Learn about INDUCTION OVERHEATING


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