Which port do you vaccum out of on a compressor?

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Apr 3, 2010 | 10:02 AM

Nicnic100

Thread Starter

Junior Member

Joined: Jan 2010

Posts: 38

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From: Louisiana

Year: 1991

Model: Cherokee

Engine: 4.0L 6 cyl HO

Which port do you vaccum out of on a compressor?

I have a 1991 r12 compressor that I salvaged and am installing in my vehicle. I put the r134a conversion kit on it and now I want to vacuum it out. I think I should use the low pressure port to vacuum out of but I am not sure. Advice and any additional tips would be great. Are there any guides on replacing an a/c compressor?

Apr 3, 2010 | 11:20 AM

djb383

CF Veteran

Joined: Nov 2009

Posts: 8,172

Likes: 17

From: The Republic of TEXAS

Year: 1998

Model: Cherokee

Engine: 4.0L HO

I believe you need to know how many ounces of oil your particular system requires. Too much oil, it won't cool properly, too little oil could be disastrous.

Apr 3, 2010 | 11:28 AM

Desert Rat

CF Veteran

Joined: Sep 2009

Posts: 3,612

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From: West Valley

Year: 1998

Model: Cherokee (XJ)

Engine: 4.0

Vac from the low side, be sure to add oil back in I usually put 4oz in the compressor and 4oz in the accumilator. Make sure you replace the orifice tube as well and you should be good to go.

Apr 3, 2010 | 03:57 PM

4.3L XJ

CF Veteran

Joined: Aug 2008

Posts: 6,588

Likes: 495

From: Chico, CA

Year: 1986

Model: Cherokee

Engine: 4.3L with headers and full 3" exhaust system

What orifice tube are you talking about? These have a TXV for a metering device. And vacuum on the low side. Both if you can by setting up a set of gauges.