Interesting AC Issue - JeepForum.com
 
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post #1 of 5 Old 08-15-2017, 08:27 PM Thread Starter
JC_Sahara
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1999 XJ Cherokee 
 
Join Date: Mar 2010
Location: Columbus GA
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Interesting AC Issue

Hey Guys, I am new to the XJ world. I recently purchased a 1999 Jeep cherokee and the PO did inform me that the AC wasnt working. He shaved off the price and I went ahead and bought it. Thinking I would jump ahead of the curve, I went to rock auto and bought the compressor kit and condenser. Took it to my local shop and asked them to check the system. They called me back saying that the orifice tube, accumulator/dryer and the manifold that mounts to the compressor would need to be replaced. So they replaced those parts and checked the system and it held pressure. They charged the system and ran it but the air was still not cold (cool but just slightly below the ambient temp here in GA). Checked the blend door actuator and it wasnt budging. Replaced it with a working unit and it seems to move. Still the same issue. Thinking it could still be blend doors, I removed the actuator and used the input shaft from the old motor to turn the door manually. It seemed to travel the full range. I noticed if I moved it to the hot side by hand, suction would occur and make it very hard to move the door. This didnt happen for the cold side. Could this mean that there is something preventing the door from fully allowing cold air to pass through?

For the record, the PO gave me a file that contained all of his maintenance records. In those records it was noted that the Evaporator core and heater core were replaced in November of 2013 when the jeep had 139k on it. The jeep now has 151k so I imagine that those parts are good to go (heat works really great lol). I have been debating the heatertreater kit that replaces the door with a metal one, but I am not sure that is my issue. My dryer sweats like a mad man when its running so I assume thats a good sign its working. I just dont know how to proceed from here. Any suggestions on what to check next? The guy at the shop really wanted to pull the dash, but I didnt want to toss 1200$ in labor just to have him peak around and look on a whim. Besides, if need be, I can pull the dash on a weekend. Just trying to avoid that if possible. Just need to make sure I am on the right track in narrowing this down.


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post #2 of 5 Old 08-21-2017, 12:47 PM
sgtbookie
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Not much to offer in the way of troubleshooting, but I'm tracing a similar issue on my sons 98 XJ. I've had an AC guy verify the low and high side pressure and fill it properly. I get cool air, but no where near cold air.


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post #3 of 5 Old 08-21-2017, 01:21 PM Thread Starter
JC_Sahara
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Location: Columbus GA
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Quote:
Originally Posted by sgtbookie
Not much to offer in the way of troubleshooting, but I'm tracing a similar issue on my sons 98 XJ. I've had an AC guy verify the low and high side pressure and fill it properly. I get cool air, but no where near cold air.
No worries.

I cut a hole in the HVAC box near where the blend door actuator bolts up at. I was able to verify the blend door works properly. I also noticed that the foam around the evaporator was missing and that the evaporator itself was only getting ice cold near the top half. The bottom half was room temp.

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post #4 of 5 Old 08-21-2017, 01:29 PM
Chero2000
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Sounds like my problem too..... I checked the blend door also and it seems to be working fine. I'll be watching this post to see what you find.
John
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post #5 of 5 Old 08-22-2017, 07:20 PM
czjeeper
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Did they tell you what pressures it was running?
Verify that the condenser and radiator are clean without any blockages. Fan clutch in good shape?

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