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I need help with compressor oil

Toughnut on Sun September 23, 2007 8:50 PM User is offline

Year: 1981
Make: Jeep
Model: CJ7
Engine Size: 4.3V6
Refrigerant Type: R134
Ambient Temp: 100

This summer I installed A/C in my 81 CJ7. everything worked fine, but the compressor(brand new HT6) leaked at the switch port. I replaced the oring and recharged it again. It again leaked down after a couple of weeks. This time the leak is at the front of the case. The distributor sent me a new compressor that is filled with 8 oz of PAG 46. I used 8 oz Ester oil in the original fill.

Do I just drain the new compressor and add the amount of ester oil from the old compressor, or do I have to flush out the new compressor to make it compatible with ester oil?
Thanks for the help!
Charlie

Chick on Sun September 23, 2007 10:10 PM User is offlineView users profile

Drain the oil from the compressor, use some ester oil to flush the PAG out, filling and turning the outer hub, Drain again then refill with whatever amount of ester you plan on using (depends on how much was in the old compressor, flush etc) then install and recharge..Hope this helps..

PS: If you don't flush the system, you really don't know how much to replace, so depending on what parts you're changing will determine how much oil to add back..

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Toughnut on Sun September 23, 2007 10:36 PM User is offline

Thanks, Chick.
I wish they would've sent me a dry compressor, it would have made it easier.
I'm not changing any other parts other than the compressor. Nothing failed, the compressor case leaked. It has very few miles on it, maybe 200.

I'll measure the amount of oil in the "old" compressor and add that amount to the flushed out new compressor.

Why do they ship them with oil in them? The original was dry.
Thanks again. Charlie

Chick on Sun September 23, 2007 10:43 PM User is offlineView users profile

Some are shipped dry, others with the system amount of oil. Depends on the vendor..No big deal really. But, since the compressor was leaking, be sure you pull a good vacuum before charging and watch the pressures.. If not done correctly, you could have issues with high pressures causing the leaks..Did you change the drier after changing the original compressor? What was the reason for it failing? was the system flushed of the old mineral oil? These questions need to be looked at before putting another compressor on the car... Also, a Jeep with an HT6?? what is that about... Chev engine??

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

Toughnut on Sun September 23, 2007 10:55 PM User is offline

It's a brand new A/C system I installed this summer. I bought this CJ new in 1980, never had air, but my wife wouldn't run around in the Arizona desert with me any more so I put in aftermarket air. The engine is a 99 Chevy 4.3 Vortec MPSFI, so I used a HT6 that bolts right on. It leaked from the git go, first at the switch port, then the front housing seal. Very slow, but leaks none the less.
Ranshu stood behind the compressor and sent a replacement, but as you know, it's full of PAG.
I originally used ester oil because it was recommended by a tech. Should I flush the system and change to PAG?
Thanks Charlie

Chick on Mon September 24, 2007 4:45 AM User is offlineView users profile

You can keep it ester, but if you could flush the system to be sure you have the right amount in would be good. Or if you deside to use PAG use "only" double end capped PAG. Here's a link to the boards sponsor for parts and "oil". If you have the time, get the BVA auto 100 ester.. They (ester oil) are not all the same...
Ackits.com oil page

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Chick
Email: Chick

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Freedoms just another word for nothing left to lose

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