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Newbie Alert-What did I blow up?

TheClaw on Sat July 05, 2008 4:59 PM User is offlineView users profile

Year: 1998
Make: Jeep
Model: Cherokee Sport
Engine Size: 4.0 L
Refrigerant Type: 134a
Country of Origin: United States

I was high five'n myself today because I thought I evac'd and charged my Jeep just right. It blew cold for a while but shortly after being on the road it stopped blowing cold and I started getting moan, groans and rattling noise under the hood. I lift the lid and I could see oil sprayed all over the hose behind the compressor.

I used a Robinair pump according to our hosts instructions in the FAQ. I have US General (read Harbor Freight) gauges. I bought a used pump and set gauges locally they were used only once and it was a pretty trusted seller. I put about 3 11oz cans of 134a in for the charge. Did I over fill it? I'm not sure where the leaks are coming from since there was so much oil. Here is a picture of the gauges after everything was said and done.

If repairing this is a fairly straight forward R&R of some parts I could use some advice on where to start. I don't mind a challenge but I'm new at the AC stuff. If a semi-pro wrench can handle it then I'd like to give it a try. If it could be the kind of job that ruins my marriage then maybe I should send it to the shop. I would like to learn how to do this since my '84 Porsche needs an evac and charge and I'd rather experiment on the Jeep than the Porsche.

Thank you,


TRB on Sat July 05, 2008 5:04 PM User is offlineView users profile

This system calls for 20 ounces of R134a refrigerant.


When considering your next auto A/C purchase, please consider the site that supports you:

Chick on Sat July 05, 2008 5:06 PM User is offlineView users profile

Check for a sticker under the hood, I show 20 ounces for the 98. If you overcharged it, you could have blown the pressure relief valve Some reset, others do not. But see if thats where it escaped from. Also make sure your fan clutch is in top shape, and the electric fan, if equipped, is working when the ac is turned on..Hope this helps..

Email: Chick


Freedoms just another word for nothing left to lose

tony1963 on Sat July 05, 2008 5:19 PM User is offline

You definitely overcharged the system. If I recall, those systems hold 1.25 lbs of R134a, about 20 oz, or not quite two 12-oz cans.

The system has a pressure cutoff switch that should have shut down the compressor before it spilled the gas out. My guess is that you blew the seals on the compressor, or, at least at the lineset connections.

Grove Automotive Group, Inc.

An Alabama Corporation

TheClaw on Sat July 05, 2008 11:16 PM User is offlineView users profile

I thought I saw a chart somewhere that it was 33oz but can't point to it exactly. I don't think I put a full 33 in there since the cans had residual gas in them when I disconnected them, still I looks like I over charged it beyond 20oz. How would I tell if the seals on the compressor were blown or the line set seals? If I'm hearing whining noises from the compressor does that mean it's toast?

Edited: Sun July 06, 2008 at 9:40 AM by TheClaw

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