GMT 800 & Older GM General Discussion 2006 & Older Trucks | General Discussion

What the Hot Air is going on here?!?!?

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Old Aug 1, 2005 | 06:29 PM
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Angry What the Hot Air is going on here?!?!?

OK, Texas guy here, and I was welcomed by 100 degree heat today. No biggie, auto A/C always takes care of it. 3-4 minutes into ride, and not feeling any relief. Press the Recirc button (since it always turns off) and wait for salvation. Still getting hotter. Pull over under a shade tree, and mirror thermometer reads 105. Now I'm

Check out the display, and it only shows it is blowing at about 50%. I manually turn it up, and hear what sounds like the flap for fresh/recirc air close. I am sweating bullets by now No relief.

I turn it all off, then back on, and all is well. 2 hours later get back in the truck, and repeat process. Ain't this some

Any tips?
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Old Aug 1, 2005 | 10:24 PM
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Mine periodically does'nt work when I crank the truck. As soon as I put it in gear and start moving it starts blowing cold air.
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Old Aug 1, 2005 | 10:27 PM
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ya... the r134a blows cooler or sometimes ONLY blows cool when air is passing through the condenser... it'll stay cold for a while after you stop but not as good.

Did you check your freon levels, SCIV?
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Old Aug 2, 2005 | 07:21 AM
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Originally Posted by SSlow 4.8
Did you check your freon levels, SCIV?
Well, that never occurred to me since the truck isn't even a year old yet.
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Old Aug 2, 2005 | 07:23 AM
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ya.. idk maybe you have a leak. I'm not sure if the 04s are like this.. but is the button that has a "snowflake" looking object turned on? I have bumped mine before and i didnt get cold air bc the "snowflake" button wasnt lit up.
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Old Aug 2, 2005 | 08:24 AM
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Originally Posted by SSlow 4.8
ya.. idk maybe you have a leak. I'm not sure if the 04s are like this.. but is the button that has a "snowflake" looking object turned on? I have bumped mine before and i didnt get cold air bc the "snowflake" button wasnt lit up.
Snowflake button, i like that. Low freon levels will also cause the evaporator core to ice up and block the air flow. Mine has done it a few times and i would have to turn off the compressor (snowflake button) and let it thaw out.
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Old Aug 2, 2005 | 08:53 AM
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Welcome to the club SCIV. I have been having major issues with mine. I have had it in the dealership twice for the same problem over the last 3 weeks. Both times they replaced a cycling switch. It would periodically blow hot *** air. Sounds like the same problem I was having. Both times it has only taken them a few hours to fix. But still a pain in the ***.
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Old Aug 2, 2005 | 09:06 AM
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Yeah had similar situation with my 03. Took it to the dealership and a sensor/ switch was replaced. Worker stated that is kinda common with these late model trucks. They had my truck on and running in less than a hour. Air is working fine know.
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Old Aug 2, 2005 | 10:39 AM
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I had to replace the entire AC unit on my truck about a month ago. The bearings went out on the compressor. Hefty $1k bill, not under warranty.
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Old Aug 2, 2005 | 11:49 AM
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Ughhh, that sucks.
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