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Power Strokes 1994-1997 General Technical discussion of topics related to vehicles powered by the Power Stroke engine in 1994 through 1997 models.

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Old 07-16-2006, 12:22 PM   #1 (permalink)
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AC stops cooling

I have a 1997 F250 with 7.3. The AC stops cooling in low idle, stop and go traffic conditions. I can turn the AC off then back on and it will start to cool again. But eventually will get warm. At speed the temperature exiting the air duct is 45 - 50 degrees (the systems works very well). I have checked the following;
engine cooling fan operation - normal
engine coolant - full
engine temperature - normal
AC refrigerant - 50 - 55 psi on a 95 degree day
Fan speed - normal
Any susggestions would be greatly appreciated. Thanks
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Old 07-16-2006, 01:21 PM   #2 (permalink)
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Re: AC stops cooling

With the engine cooling fan depending on engine temperature to engage and a diesel engine actually running cool at idle and not needing any help from the fan it is a common thing with these trucks to do that. Some have installed an electric cooling fan to fix it, some have gone to a large aftermarket engine cooling fan that is engaged electrically instead of dependant on engine temp.

Mine is pretty much the same thing, although I can hang refrigerated meat in the cab when I am going down the road.

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Old 07-16-2006, 01:29 PM   #3 (permalink)
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Re: AC stops cooling

Mine started doing the same thing last year. I then switched to some electric fans and now that sucker is cold all the time. You may just want to mount a small one for the AC and it will probably help a whole lot. Just wire it with a relay to come on when the AC is on.

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Old 07-16-2006, 05:41 PM   #4 (permalink)
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Re: AC stops cooling

You really need to take low and high side pressures, not just low side. When the vehicle is stationary, there is less air to make the heat transfer from the condensor. When moving, more air so better cooling. Mine works fine when sitting still in 95 degree heat. I think you have some problems somewhere. Check out this site for free help
http://www.acsource.net/acforum/
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Old 07-16-2006, 07:13 PM   #5 (permalink)
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Re: AC stops cooling

truck setting still---at about 1400 rpm---low side pressure should be between 40-55 psi--if not--might be a tad low on freon--which would show up at idle--and on hot humid days----people say--it worked fine at 85 degrees---now doesnt--its because the thing needs a full charge at high temp and humidity levels----
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Old 07-16-2006, 07:32 PM   #6 (permalink)
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Re: AC stops cooling

Just had this issue last week. Found the connection on the pressure switch on the compressor slightly corroded. Pulled the harness for that one and the compressor clutch and cleaned them both. Works great now.
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