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
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.
Dave / Believer45
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'95 F250 ext cab long bed, PSD, 5 speed, 2 wheel drive, 3.55 gears, 286,000 miles, Edge Evolution CTS (LINK TO MY REVIEW), LUK clutch, homemade REAR BUMPER, open element AIR FILTER, 36" ARE contractor cap. With tools, full of fuel and me on board (300 lbs) steer 3620, drive 3860 total 7480.
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.
2005 Dodge Durango Limited w/HEMI.
2006 Chevrolet Cobalt LT.
SOLD 1996 F250 CC 4X4- Stage 1, Tymar, 4" exhaust, BDP chip...etc.
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/
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----
94 f250 idi turbo sc e4od alum fac rims 149,289 --dana 60 frt with posi--10.25 rear w/posi--shouldnt get stuck!! ats turbo 3" parts on--what a diff from stock turbo!!!!!--- also 96 F250 with 305,000 is fixed!!-- 7.3 rattler-also 85 6.9-needs new engine!! tired!!
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.
96 F350 reg. cab SRW 4x4, original owner. 5 spd. manual with a South Bend Clutch solid flywheel and Con-O clutch kit, clutch petal mod., Truetrac differentials, front and rear, 4.10 gears. Tymar intake, gutted EBPV, 3" downpipe, 4" exhaust, BDP stage 1 injectors, DIY IDM mod, 4 pos chip, DIY Stealth twin HPOP's, DIY electric fuel system, Banks technicooler intercooler. 375k miles.
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