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1999 Ford Ranger AC low side pressure reads 100 psi

Have had this 1999 Ranger SuperCab 5 years and never had an AC problem. It started getting less cool and within 2-3 days only blows warm air. Have had a couple of other cars the last few years that cost $600 and $1000 on AC fixes and I'm not going to put that kind of money into this Ranger with 160,000 miles. I've recharged the freon on multiple cars before and decided try that first. Bought a refill kit with a pressure gauge and checked the low side pressure and it reads 100 psi. Haven't looked up the psi specs on the Ranger, but AC systems I've charged before that needed freon were 20 psi or less and had upper psi limit on low side of 45-50. Do you think I got a kit with a bad gauge or is high pressure a sign of some other problem?

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  • Glenn Hollowell Feb 03, 2012

    It was when I started, but I can't say for certain it hadn't clicked off before I got the cap off and fumbled around attaching the hose. CARELESS!! I'll check it again in the morning.



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  • Ford Master
  • 5,332 Answers

Was the a/c compressor running when you got this reading?

I’m happy to assist further over the phone at

Posted on Feb 03, 2012

  • Jeremy W.
    Jeremy W. Feb 03, 2012

    Sound like you where reading the pressure with the compressor off. They will equalize around that amount. If the compressor was running you have a bad compressor.



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Posted on Jan 02, 2017

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SOURCE: no air conditionong have 45 psi freon compressor

You don't have enough freon in it. 45 psi when the compressor is not turning is low, Add one can and see what happens. Normal low side pressure with the compressor turning is 35 psi.

Posted on Jun 07, 2009

  • 1 Answer

SOURCE: 1993 ford ranger supercab

the fuse box is inside the pickup under the drivers side dash, there is a flasher which is the round one in the fuse box, it controls turn signals and emergency flashers also in the same fuse box, there is a 15 amp fuse which controls just the turn signals it sits vertical instead of horizontal.

Posted on Oct 23, 2008

  • 407 Answers


look by the battery there is a 2 wire switch with 2 vac. lines hooked to it see if on of the lines are cracked

Posted on Oct 21, 2009

  • 11800 Answers

SOURCE: Can i use parts from a 2003 FORD RANGER SUPERCAB

Yes, up to the firewall they are pretty much the same

Posted on Mar 23, 2010

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