Air conditioning flipping out - Chevy and GMC Duramax Diesel Forum
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Old 08-22-2010, 11:40 AM   eBay Motors  #1 (permalink)
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Air conditioning flipping out

I took a trip to Virginia on Wednesday, and I stopped to get a couple of hours of sleep in a rest area. When I woke up about an hour later my air conditioner was blowing hot air (Like the heater was turned on). I turned the truck off and restarted it and it started blowing cold again. The same thing happen on the way home, but this time I pulled over to get a bite to eat and left the truck running. I was not out of the truck for more than 10 minutes. I turned the truck off and restarted it and it was cold again. When the ac is running it is very cold and cool the truck of in just a few minutes even in this hot weather. Has anyone seen this before? Any help in appreciated.
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Old 08-22-2010, 03:03 PM   eBay Motors  #2 (permalink)
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It could be your blend door flipping out, but that is unlikely. Next time it happens pop the hood and feel the two lines going to the compressor. One should be hot and the other cold if they are about the same temp then it could be a electrical control issue. What could be happening is when you let it idle and your control wires get two hot it makes more resistance and the current can't get though and shuts off the compressor. I will talk to some of the guys I know and get back to you.
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Old 08-22-2010, 04:36 PM   eBay Motors  #3 (permalink)
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Thanks. Any help is greatly appreciated.
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Old 08-23-2010, 10:00 PM   eBay Motors  #4 (permalink)
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So I talked to my Buddys and he had know idea. The only thing one said was that smaller diesels are not meant to idle long so instead of shutting off the truck after a certain amount of time the PCM shuts off the accessorys to get you to shut off the truck, but I not to sure that's it. I think that since it only happens when you idle to long I would not worry about it.
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Old 10-24-2010, 02:38 PM   eBay Motors  #5 (permalink)
 
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I had the exact same problem. Luckly my best friend is a comercial air conditioning specialist. The problem was the teflon seals on the 5 cyclinders in the air conditioning compressor. I purchased a new Works compressor from AutoZone for $210 and installed it in less than 30 minutes. Make sure the in-line filter is replaced also. With this change, the system is now blowing freezing cold at idle and at speeds. You will be able to see the teflon seal debree in the in-line filter.
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Old 04-21-2011, 06:45 PM   eBay Motors  #6 (permalink)
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Well, now that it is actually needed my A/C has started to act up again. When I turn the A/C on it is cold, but it does't have much volume and come out on my feet even if the vents are selected. The fan sounds like it is blowing normal there is just very little air coming out. The other thing that happened today for the first time is when I pulled up to a light and the RPMs went down the air got warm. As soon as I started going again the air cooled back down to normal. Any ideas would be appreciated. I have 1 1/2 weeks before hitting the road again. Thanks again.
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Old 04-21-2011, 06:55 PM   eBay Motors  #7 (permalink)
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sounds like you have a couple issues going on.

1. sounds like a mode door actuator problem for the air blowing out on the floor when vents are selected. find someone with a scanner that will read HVAC codes and see if the mode door actuator set a code. if you have automatic a/c, there is a reprogram out for the HVAC controller that will fix issues like that if there isnt a problem with the mode door.

2. if it is warm when idling but gets cold when you start raising the rpm's, the refridgerant level is probably low it the system. you could go buy a refill kit from a parts store and fill it up but there is probably a leak in the system so it will leak out as soon as you fill it up. you need to have dye put in it so you can find the leak.
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Old 05-18-2011, 08:36 PM   eBay Motors  #8 (permalink)
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Mine did something similar last weekend.
We were driving down the road...and all of a sudden...the drivers side 2 vents started blowing hot air(I have the dual zone climate control system).
The passenger side vents were still blowing cold air.

I talked to my dad(bought the truck from him) and he said it had done it a couple times before...and that his mechanic told him a procedure to "reset the system" as he put it.

With the truck running...I turned the temp of both sides...as low as they would go...then turned the truck off.
Then I restarted the truck and turned both sides as high as they would go...and then turned the truck off again.
Once I restarted the truck the third time...it worked fine.

He said it has only done this a couple times since he bought the truck...and this procedure fixed it both times.

As of now...it's still working fine.
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Old 06-20-2011, 02:05 PM   eBay Motors  #9 (permalink)
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Quote:
Originally Posted by dcfox View Post
Mine did something similar last weekend.
We were driving down the road...and all of a sudden...the drivers side 2 vents started blowing hot air(I have the dual zone climate control system).
The passenger side vents were still blowing cold air.

I talked to my dad(bought the truck from him) and he said it had done it a couple times before...and that his mechanic told him a procedure to "reset the system" as he put it.

With the truck running...I turned the temp of both sides...as low as they would go...then turned the truck off.
Then I restarted the truck and turned both sides as high as they would go...and then turned the truck off again.
Once I restarted the truck the third time...it worked fine.

He said it has only done this a couple times since he bought the truck...and this procedure fixed it both times.

As of now...it's still working fine.

Mine did the exact same thing today. Fooled with the temp controls and the settings and found it would blow cold air out at the floor when that was selected but had hot on the drivers side and clod on the passenger side if the panel outlets or defroster was selected. Turned the truck off and let it set for a minute or so then restarted it. Now it is working OK. Mid 90's today so Murphy is around I guess! I'm guessing it is a blend door issue since it is still cold on the passenger side.
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Old 10-04-2011, 08:01 PM   eBay Motors  #10 (permalink)
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Quote:
Originally Posted by dcfox View Post
Mine did something similar last weekend.
We were driving down the road...and all of a sudden...the drivers side 2 vents started blowing hot air(I have the dual zone climate control system).
The passenger side vents were still blowing cold air.

I talked to my dad(bought the truck from him) and he said it had done it a couple times before...and that his mechanic told him a procedure to "reset the system" as he put it.

With the truck running...I turned the temp of both sides...as low as they would go...then turned the truck off.
Then I restarted the truck and turned both sides as high as they would go...and then turned the truck off again.
Once I restarted the truck the third time...it worked fine.

He said it has only done this a couple times since he bought the truck...and this procedure fixed it both times.

As of now...it's still working fine.
I'll try that tomorrow, mine is doing the same bullshit thing and has been for a few weeks now. It did it a few times but after re-starting the truck it would go back to cold air.....
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