AC Issues. I'm stumped.
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Senior User
Joined: Oct 2008
Posts: 437
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From: Bucyrus, KS
AC Issues. I'm stumped.
For some reason my A/C has been working intermittently most of the time it stops working when it idles for a few minutes. If I'm headed down the highway most of the time it works fine. I just replaced the fan clutch so I know that's not it. I also tested the cycle switch it works fine. And the pressures are fine. So I don't know what it is. Any help would be appreciated. Thanks
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Joined: Mar 2005
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From: Denison, Tx
There is a vacuum valve on some motors controlling water thru heater core it is on the passenger side in engine compartment close to firewall..small tube running to it sometimes falls off just slip it back on..might be your problem..
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Senior User
Joined: Oct 2008
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From: Bucyrus, KS
The Egr Valve is plugged in but the cooler is deleted and I'm pretty sure the Tuning shuts off Egr function. Also I replaced the vacum heater valve as well. I'm not sure what's it's deal is. It's done it for the last year or so. I just don't know a whole lot about A/C and I didn't want to just start throwing parts at it. It does have 250,000 miles on it so maybe the compressor is wore out.
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Senior User
Joined: Oct 2008
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From: Bucyrus, KS
Yea they seem to be working. My vac pump runs for 5 seconds every time I start the truck and shuts off and holds vacum. I've recently replaced the 4wd Hub vac switch as well. It was leaking bad for a while.
Hotshot
Joined: Jul 2005
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From: Middle Tn.
Your description sounds like it could be just a hair low on freon. These systems are very finicky. More touchy about pressures than any of the earlier ac's that I've worked on.
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Hotshot
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From: Stuttgart, Ar
You got that right Mike. Even with the correct amount of freon in mine I found that a set of gauges seems to have better luck at getting the system to cool properly and pulling a vacuum on it prior to charging is critical.
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Have you checked your pressures with a gauge set? My AC was going warm at idle and my high side pressure was getting high enough to kick the compressor off. It worked normally once you were moving. I never did find a problem, I thought the fan should work off of the AC system, but I didn't get an answer.
Hotshot
Joined: Dec 2003
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From: Stuttgart, Ar
Have you checked your pressures with a gauge set? My AC was going warm at idle and my high side pressure was getting high enough to kick the compressor off. It worked normally once you were moving. I never did find a problem, I thought the fan should work off of the AC system, but I didn't get an answer.
The engine fan has a LOT of different things the PCM looks at to make it work. It's a pretty complex operation.
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Yes, that is correct. My system was full before I removed the refrigerant. I had about 20 in of vacuum before I added refrigerant back into the system. I was still seeing my pressure getting too high when there was no air flow through the condenser.