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Jeep Cherokee Evap Leak

fasto on Tue April 15, 2008 10:16 AM User is offline

Year: 1998
Make: Jeep
Model: Cherokee
Engine Size: 4.0
Refrigerant Type: 134a
Ambient Temp: na
Pressure Low: na
Pressure High: na
Country of Origin: United States

Hi guys, after the good work helping me with my VW, now my brother is asking for help. He's got a '98 Jeep Cherokee (not the Grand, just the regular). The AC system is about empty. I think the evap is leaky, based on the amount of oily crud I saw in the evap case drain outlet. I didn't have time to look over it much more. It did have a little pressure, as the compressor would short cycle and pull the suction into a vacuum while building pressure up to ~90 PSI until one of the low pressure cutouts dropped out.
Based on those 2 things, I think it's OK except for the evap.
Couple questions:
1) Does the dash have to come out to replace the evap? I told him it does, and plan 8+ hours of work. We'll get the Alldata DIY before we start but I'm trying to prepare him for the time involved.
2) Special tools to disconnect the evap fittings? It looked like some sort of a push on fitting, and I did not recognize the type.
3) Anything else to watch for?

When I find out about the evap fitting tools I will be ordering the repair parts from AC Kits. I figure evap, o-rings, rcvr/drier. I have the rest (vac pump, recovery unit, etc.).
Thanks,
Aaron

TRB on Tue April 15, 2008 4:38 PM User is offlineView users profile

Yes this is a fun one but there are worse at there! Can't go wrong with the Alldata subscription.

Spring Lock Tools

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Contact: ACKits.com

fasto on Tue April 15, 2008 6:40 PM User is offline

Hi Tim, thanks for the quick response!
This car has a Sanden compressor, can't recall the model, which oil would you recommend? I think DEC PAG 46 would be the correct oil, this works in the VW's Sanden compressor.
I read a bit about the spring lock fittings on Fords and the troubles of getting a good seal. Would that apply to this Jeep as well? (Probably, right?).
Again thanks for the help!

TRB on Tue April 15, 2008 10:19 PM User is offlineView users profile

According to my data that system uses PAG 100.

Spring lock fittings are the same design across the board. Don't see as many issues with the Chrysler vehicles. But there is nothing special about their fittings.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

fasto on Wed April 16, 2008 2:26 PM User is offline

Order placed, thanks again!
--
Aaron

TRB on Wed April 16, 2008 2:51 PM User is offlineView users profile

I just noticed that, thanks for the support!

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

fasto on Wed May 21, 2008 11:12 AM User is offline

I'm getting ready to replace this evaporator this weekend and I'm looking at the Alldata info on capacities and it sounds ridiculous. I don't have the car to check the underhood sticker.

Refrigerant capacity: 570g (1.26 pounds)
Oil capacity: 8.1 Oz

Can this be correct?
For reference: My VW uses a similar Sanden compressor, and has a MUCH smaller condensor, evaporator, rcvr/drier, shorter lines, and 1/4 the cabin space calls for 750 to 1050 grams of refrigerant and 4.1 Oz of oil!
--
Aaron

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