Question about Jeep Grand Cherokee

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2005 jeep grand cherokee 3.7 L. - ac issues - tested for power at relay and fuses good power found . tested for power at compressor - no power , tested for power at pressure sw. @ dryer- no power . checked compressor opperation w/ gauge set- no freon- but pulls 20 inches of vacume on low side - compressors good - filled system w/ leak sealer and 1.5 lbs 134a . ran compressor by jumping with jumper wire at relay- pressures 40 @ low side 220 hi side @ 85 deg. f. ambient temp . system was producing 60 deg. f. cooling - light is on on dash where ac switch is, but why no power to compressor unless jumped - please explain . currently running w/ fused jumper wire . PLEASE HELP......Mark

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6ya6ya
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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: The ac compressor on a 190e 2.6 does not come on.

I WILL LOOK AT MY FACTORY BOOKS. CERT MASTER MB TECH EMAIL GBCMBTECH@MSN.COM

Posted on Jul 15, 2009

  • 1348 Answers

SOURCE: 1996 lincoln towncar. No a/c compressor engagement unless jumped

the control unit is no good.i had a similar situation with a 98 tracker,and installed a switch to give it a ground for the compressor relay that comes from the a/c computer module.
it works good and goes on and off with the a/c switch.

Posted on Jul 18, 2009

roniecon
  • 6826 Answers

SOURCE: AC has freon (134a) pressure is good. Compressor

Have a code reader or scanner put on the car to erase all codes,this should reset the ac system circuit.Also check the low side clutch cycle switch,it may be the problem.

Posted on May 01, 2010

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  • 110 Answers

SOURCE: 2005 Expedition ac not cooling. Freon OK. Fuse

compressor relay in underhood relay box

Posted on May 10, 2010

tripletauto
  • 1450 Answers

SOURCE: put in a new dash

YOUR a/c compressor is cut on by the vehicle pcm(computer).pcm sends a signal to a/c relay to energize relay which sends power to compressor. Have you checke dall the fuses with a test light? last dodge i worked on had a blown horn fuse which powered a/c system also. block said nothing about this. here is a diagram999f7d5.gif

Posted on May 21, 2010

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