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94 Jeep Cherokee AC Repair Help

IslanderOffRoad on Tue July 22, 2008 2:20 AM User is offline

Year: 1994
Make: Jeep
Model: Cherokee
Engine Size: 4.0L
Refrigerant Type: OEM R12 Now 134

Last year while driving to work I got off the freeway, noticed a clacking noise comming from the engine when at idle, then at the next stop light got some major belt squeal. turned the a/c off and it went away.

tried turning the a/c on a few min later to see what was going on, and noticed a noise again, plus a chemical smell comming through the vents. turned it back off.

got to work, gave it a quick test while parked, when the a/c is on i'm getting a bad vibration coupled with a 300rpm drop... it didn't do that before.

I had bought the Jeep with a non-working A/C system a year prior, and about a month before it happened I had the a/c looked at, the mechanic could not find a problem with the system, recharged it, converted to 134 and sent me on my way.

As I did not have the money to fix the a/c at the time, I unplugged the compressor relay and drove without for a year. I've always wanted to get it working again though, and have done some research, bought some parts, and am wondering where to go from here.


I just bought a brand new Sanden Compressor off ebay, part #55037359AB, which if I got my research right is 94-96 XJ, 4.0L w/134A. Got it for $135 shipped, so a good deal compared to what else I've found.

I read through this thread again and it appears I need to pick up the following:
R134 Expansion Valve
Filter (aka receiver/dryer)

I'll need to get the system evacuated before starting, and then after the new parts are in I need to get a vaccum pulled on it, then recharged.

Is that correct? What am I missing here. I plan to do all the hard parts labor myself and only use a shop for the vaccum, evac, and recharge. Are there any other parts I likely should replace (I had a catastrophic seizure and belt shredding) ? Lines? Condensor? I would love for this to be the last time I ever have to do a/c work, but have a budget to think about as well. Where can I pick up the remaining parts for a reasonable cost?

Thanks

Chick on Tue July 22, 2008 6:11 AM User is offlineView users profile

The chemical smell thru the vents could be a leaking evaporator. Have it checked "before" changing the compressor. You can get the parts you need right here at ackits.com. If the old compressor shed it's insides thru the system, a system flush will be needed. Flushing and vac/charge procedures are on the FAQ section of this forum..Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

IslanderOffRoad on Tue July 22, 2008 1:41 PM User is offline

Quote
Originally posted by: Chick
The chemical smell thru the vents could be a leaking evaporator. Have it checked "before" changing the compressor. You can get the parts you need right here at ackits.com. If the old compressor shed it's insides thru the system, a system flush will be needed. Flushing and vac/charge procedures are on the FAQ section of this forum..Hope this helps..

Thanks for the info

I'm fairly sure the compressor is shot. I had massive bearing squeal before this happened, shredded a belt after it happened, but when the a/c is off the pulley will still free-wheel.

I grabbed the OE compressor due to the price, but I plan on taking it to a shop for an estimate before tearing into it myself, as well as to have them evac, recharge, and pull vacuum.

Chick on Tue July 22, 2008 6:36 PM User is offlineView users profile

It's a good bet, with what you just described, that the insides of the compressor did make it into the lines, and I would suggest flushing the system before re-charging..Hope this helps..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

IslanderOffRoad on Wed July 23, 2008 1:25 AM User is offline

Safer bet to replace the lines?

What is involved in a flush?

Chick on Wed July 23, 2008 7:23 AM User is offlineView users profile

these are the flush procedures listed in the FAQ section of the forum..Hope this helps

-------------------------
Chick
Email: Chick

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Freedoms just another word for nothing left to lose

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