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

LinkBack Thread Tools Display Modes
post #1 of 6 (permalink) Old 07-16-2006, 11:22 AM Thread Starter
Junior Member
Join Date: Jul 2006
Location: Raleigh, NC
Posts: 5
My Photos: (0)
Feedback Score: 0 reviews
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
block002 is offline  
Sponsored Links
post #2 of 6 (permalink) Old 07-16-2006, 12:21 PM
Lifetime Supporting Member
Join Date: Dec 2000
Location: Goshen, OH just east of Cincinnati
Posts: 6,326
My Photos: (61)
Feedback Score: 0 reviews
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.

Dave / Believer45

THANK YOU to all the heroes in our military and all the heroes at home who wait for their safe return. I am humbled by and grateful for your service and sacrifice.


'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.
Believer45 is offline  
post #3 of 6 (permalink) Old 07-16-2006, 12:29 PM
Senior Member
Join Date: Mar 2002
Location: Fort Collins, CO
Posts: 1,469
My Photos: (0)
Feedback Score: 0 reviews
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.


2003 Ford Excursion...7.3, 4X4.
agsF2501 is offline  
post #4 of 6 (permalink) Old 07-16-2006, 04:41 PM
Senior Member
Join Date: Sep 2003
Location: houston area
Posts: 728
My Photos: (0)
Feedback Score: 0 reviews
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

1997 F250 Extended Cab with 143k and all stock.
mrvmax1 is offline  
post #5 of 6 (permalink) Old 07-16-2006, 06:13 PM
Senior Member
Join Date: Jan 2003
Location: iowa-usa
Posts: 4,067
My Photos: (0)
Feedback Score: 0 reviews
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----

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!!
94_turbo is offline  
post #6 of 6 (permalink) Old 07-16-2006, 06:32 PM
Senior Member
Join Date: Nov 2005
Location: Haymarket, Va.
Posts: 154
My Photos: (0)
Feedback Score: 0 reviews
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.

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.
96F3504X4 is offline  
Sponsored Links

  Diesel Forum - > Ford Diesels > Power Strokes 1994-1997 General

Quick Reply

Register Now

In order to be able to post messages on the Diesel Forum - forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome