Intermittent AC - JeepForum.com
 
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post #1 of 4 Old 08-07-2017, 07:14 PM Thread Starter
mystangt
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2000 XJ Cherokee 
 
Join Date: Mar 2009
Location: New York
Posts: 979
Intermittent AC

New to me, 2000 Cherokee XJ, has been having some sporadic AC issues.

When the truck is cold, the AC cycles ON/OFF every 4 seconds and does so for the first 10-15 minutes of running. Electric fan stays OFF.

After 10-15 minutes, clutch engages and the AC stays ON consistently. After some time (5-30mins), for no reason, it just stops. Blower continues but the clutch disengages and AC stays is no longer ON. Then it won't work for a while... Im not sure why it starts to again, but eventually it starts to work again. Sometimes not until the Jeep sits for a few hours, sometimes soon after its been parked... I have no clue where to start. Electric fan seems to come on later than i think it should, but it does eventually come on. Blower works 100% and there is plenty of hissing when i press the shredder valve on the low pressure side (near the canister at the passenger side fire wall).

Basically, works when cold then stops when the truck gets hot. Any ideas? Im stumped...

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post #2 of 4 Old 08-07-2017, 07:25 PM
deadcode
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1996 XJ Cherokee 
 
Join Date: Jul 2017
Location: Gasden
Posts: 83
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Quote:
Originally Posted by mystangt View Post
New to me, 2000 Cherokee XJ, has been having some sporadic AC issues.

When the truck is cold, the AC cycles ON/OFF every 4 seconds and does so for the first 10-15 minutes of running. Electric fan stays OFF.

After 10-15 minutes, clutch engages and the AC stays ON consistently. After some time (5-30mins), for no reason, it just stops. Blower continues but the clutch disengages and AC stays is no longer ON. Then it won't work for a while... Im not sure why it starts to again, but eventually it starts to work again. Sometimes not until the Jeep sits for a few hours, sometimes soon after its been parked... I have no clue where to start. Electric fan seems to come on later than i think it should, but it does eventually come on. Blower works 100% and there is plenty of hissing when i press the shredder valve on the low pressure side (near the canister at the passenger side fire wall).

Basically, works when cold then stops when the truck gets hot. Any ideas? Im stumped...
I'd try and replace the compressor relay if you haven't already. The intermittent behavior bespeaks of an electrical cause to me.

"The distance between insanity and genius is measured only by success."
- Bruce Feirstein
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post #3 of 4 Old 08-08-2017, 03:32 PM Thread Starter
mystangt
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2000 XJ Cherokee 
 
Join Date: Mar 2009
Location: New York
Posts: 979
You're thinking that its not staying energized?

How about the clutch gap? Does that sound plausible considering the "symptoms"?
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post #4 of 4 Old 08-08-2017, 11:22 PM
deadcode
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1996 XJ Cherokee 
 
Join Date: Jul 2017
Location: Gasden
Posts: 83
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Quote:
Originally Posted by mystangt View Post
You're thinking that its not staying energized?

How about the clutch gap? Does that sound plausible considering the "symptoms"?
A relay is essentially a switch, when relays start to fizzle out, they can cause erratic behavior. The compressor clutch relay is a 30amp if I'm not mistaken, and not expensive at all. Easy thing to test, and helps eliminate it as a possibility. I always start with fuses, switches/relays and move my way up through the chain.

"The distance between insanity and genius is measured only by success."
- Bruce Feirstein
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