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  #1  
Old July 15th, 2019, 11:50
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blondejoncherokee blondejoncherokee is offline
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1998 XJ AC issue - clutch doesn't turn on unless I jump it- blows cold when jumped

1998 XJ
AC used to work - now the clutch wont engage no matter what I do.
then one day it stopped, replaced relay and fuses and still nothing.
had a shop charge it while I jumped the hot for the AC straight to the battery, it blew cold after that when I jumped it.

Jumped HP and LP switches and it didnt seem to do anything. I can jump it at that relay and it'll kick the clutch on but that is simply just giving the clutch 12V, which is bypassing everything.

any ideas?

Replaced the metal line with the orifice last year when It wouldnt work, and I cant remember if I replaced the Drier or not.
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1998 4.6 stroker , aw4 XJ on 60/14b , 5.38s, grizzly/detroit, cage, 40s, psc big bore box , assist, 3 link,transgo aw4 reprogram

Last edited by blondejoncherokee; July 15th, 2019 at 12:03.
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  #2  
Old July 15th, 2019, 12:08
RCP Phx RCP Phx is offline
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Re: 1998 XJ AC issue - clutch doesn't turn on unless I jump it- blows cold when jumpe

Sounds like a loss of connection to the PCM, I would start by doing a volt check at the individual pin-outs at the PCM.
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Old July 15th, 2019, 13:47
chickenbot chickenbot is offline
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Re: 1998 XJ AC issue - clutch doesn't turn on unless I jump it- blows cold when jumpe

check the field coil as well
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Old July 23rd, 2019, 23:17
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Re: 1998 XJ AC issue - clutch doesn't turn on unless I jump it- blows cold when jumpe

Yeah so the pcm signal at the ac relay with the ac on is battery voltage . Pretty sure the ecm sends a ground signal when the ac is on. Might jump that wire to ground and see if it powers on. Then i know to work from there back
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As soon as I crest the top i'ma turn driver and floor it!

1998 4.6 stroker , aw4 XJ on 60/14b , 5.38s, grizzly/detroit, cage, 40s, psc big bore box , assist, 3 link,transgo aw4 reprogram
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Old July 24th, 2019, 07:48
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Re: 1998 XJ AC issue - clutch doesn't turn on unless I jump it- blows cold when jumpe

Quote:
Originally Posted by blondejoncherokee View Post
Yeah so the pcm signal at the ac relay with the ac on is battery voltage . Pretty sure the ecm sends a ground signal when the ac is on. Might jump that wire to ground and see if it powers on. Then i know to work from there back
I'd check to see if you have ground on pin C22 (Switch sense pin for low and high pressure switches) of the PCM, if you have ground there, then try grounding pin C13 and see if the compressor kicks on. Also C23 is the A/C request pin from the HVAC control, which should get grounded when you request A/C.
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Old July 24th, 2019, 23:52
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Re: 1998 XJ AC issue - clutch doesn't turn on unless I jump it- blows cold when jumpe

I thought c13 was not used ?
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As soon as I crest the top i'ma turn driver and floor it!

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Old July 25th, 2019, 09:13
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Re: 1998 XJ AC issue - clutch doesn't turn on unless I jump it- blows cold when jumpe

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Originally Posted by blondejoncherokee View Post
I thought c13 was not used ?
C13 is the signal from the PCM to the compressor clutch relay.
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I seem to have run out of self tapping washers
99 4.0/AW4/231, with a few basic bolt ons.

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  #8  
Old July 25th, 2019, 16:20
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Re: 1998 XJ AC issue - clutch doesn't turn on unless I jump it- blows cold when jumpe

Shows as C1 on the jtec diagram
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As soon as I crest the top i'ma turn driver and floor it!

1998 4.6 stroker , aw4 XJ on 60/14b , 5.38s, grizzly/detroit, cage, 40s, psc big bore box , assist, 3 link,transgo aw4 reprogram
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Old July 25th, 2019, 16:20
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Re: 1998 XJ AC issue - clutch doesn't turn on unless I jump it- blows cold when jumpe

http://jtec.info/index.php?title=199...kee_I-6_4.0_XJ
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As soon as I crest the top i'ma turn driver and floor it!

1998 4.6 stroker , aw4 XJ on 60/14b , 5.38s, grizzly/detroit, cage, 40s, psc big bore box , assist, 3 link,transgo aw4 reprogram
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Old July 26th, 2019, 12:05
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Re: 1998 XJ AC issue - clutch doesn't turn on unless I jump it- blows cold when jumpe

Does the ecu use the fan sensor as an input ? I do have my fan wires to its own relay. But pretty sure its been like that since ive owned it.
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As soon as I crest the top i'ma turn driver and floor it!

1998 4.6 stroker , aw4 XJ on 60/14b , 5.38s, grizzly/detroit, cage, 40s, psc big bore box , assist, 3 link,transgo aw4 reprogram
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Old July 29th, 2019, 04:33
nrwphoto nrwphoto is offline
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Re: 1998 XJ AC issue - clutch doesn't turn on unless I jump it- blows cold when jumpe

Seems like this thread is over complicating the problem. Your problem is most likely the low pressure switch. I have had to replace a couple of them on different vehicles over the years. If they sense the pressure is to low it shuts off the compressor so it doesn't burn out. If it's bad then there is your problem.
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Old July 29th, 2019, 06:30
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Re: 1998 XJ AC issue - clutch doesn't turn on unless I jump it- blows cold when jumpe

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Originally Posted by nrwphoto View Post
Seems like this thread is over complicating the problem. Your problem is most likely the low pressure switch. I have had to replace a couple of them on different vehicles over the years. If they sense the pressure is to low it shuts off the compressor so it doesn't burn out. If it's bad then there is your problem.
I thought the same thing, but then took a closer look, and post #1 says he jumped that switch (as well as the hp switch) to no avail.
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Old July 29th, 2019, 08:39
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Re: 1998 XJ AC issue - clutch doesn't turn on unless I jump it- blows cold when jumpe

Quote:
Originally Posted by blondejoncherokee View Post
Shows as C1 on the jtec diagram
You're right, I guess I didn't have enough coffee when I was looking at the FSMs, C1 is the compressor clutch relay.
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Originally Posted by cracker
I seem to have run out of self tapping washers
99 4.0/AW4/231, with a few basic bolt ons.

Click here to support
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  #14  
Old July 29th, 2019, 08:58
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Re: 1998 XJ AC issue - clutch doesn't turn on unless I jump it- blows cold when jumpe

I'm not sure if the 98 does the same thing as mine. but when the a/c is active the cooling fan turns on. if neither the fan or compressor turn on its might not be getting the signal from the pressure switches. if the fan is on and not the compressor then its likely a wiring issue to the control side of the relay.
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  #15  
Old July 29th, 2019, 09:56
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Re: 1998 XJ AC issue - clutch doesn't turn on unless I jump it- blows cold when jumpe

My snap on “red brick” scanner displays the ac switch on/off and an ac request. I think the ac switch is from the dash ac panel but not sure where the ac request gets generated. Maybe from ECU?
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