Automotive Air Conditioning Information Forum (Archives)

SeppW on Sun August 22, 2010 10:52 AM

Year: 1995
Make: Chevy
Model: K1500 Suburban

OK. This truck has rear air also. On the old compressor, an OE Harrison R4, it said 8oz of oil. In AllData it gives 11oz, but it also list the HT-6 compressor for all models of Suburbans. That can't be right since any '95 I've seen has an R4, including mine.

Is it 8oz or 11oz?

ALLData also referenced this TSB:

Bulletin No.: 02-01-39-004B

Date: November 16, 2005

INFORMATION

Subject:
New PAG Oil Released

Models:
2006 and Prior GM Passenger Cars and Trucks (Including Saturn)
2003-2006 HUMMER H2
2006 HUMMER H3
2005-2006 Saab 9-7X

Built With R-134a Refrigeration System

All Air Conditioning Compressor Types (Excluding R4 and A6 Type Compressors)

Supercede:

This bulletin is being revised to change the PAG oil part number used for R4 and A6 compressors with R-134a refrigerant systems. Please discard Corporate Bulletin Number 02-01-39-004A (Section 01 - HVAC).

All General Motors vehicles built with R-134a refrigerant systems shall now be serviced with GM Universal PAG Oil (excluding vehicles equipped with an R4 or A6 compressor).

R4 and A6 compressors with R-134a refrigerant systems shall use PAG OIL, GM P/N 12356151 (A/C Delco part number 15-118) (in Canada, use P/N 10953486).

Important: The PAG oil referenced in this bulletin is formulated with specific additive packages that meet General Motors specifications and use of another oil may void the A/C systems warranty.

Use this new PAG oil when servicing the A/C system on the vehicles listed above. Oil packaged in an 8 oz tube should be installed using A/C Oil Injector, J 45037. Refer to the HVAC Section of Service Information for detailed information on Oil Balancing and Capacities.

TRB on Sun August 22, 2010 12:09 PM

Dual unit Suburban - 11 ounces of oil.

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Cussboy on Sun August 22, 2010 1:50 PM

Not saying right or wrong, but I installed a brand-new Delphi R4 into my 1994 dual-air Suburban in March (belly leaker). Miy old R4 had ZERO oil in it (not seized up, just leaked). I added 8 oz. bottle of refrigeration oil which had UV dye in it. Why 8 oz.? Because that's what the bottle contained, and there was no oil in the new compressor either. It's been fine.

SeppW on Sun August 22, 2010 5:34 PM

I hear ya. I was getting some clarification. My old R4 said 8, but ALLData had 11 oz listed. Like I said, they also claimed all 1995 Burbs had HT-6 compressors and I've yet seen one with one. Yep, when I had my system evacuated, the machine pulled out an oz. When I got the compressor off, not a drop in it. It still ran, but system didn't cool and compressor chattered like crazy. Leaked out according to your's and GM Tech's diagnosis.

But one thing led to another. I figured while it was open, I'd flush the system. Instead of leaving well enough alone, I disconnected the liquid line from the condenser and it was stripped out. If asking why I did that, I wanted to see if any crap was in the inlet and if not, I was going to flush condenser. I don't think it was from galling but at factory during assembly by some well-paid assembler who cross threaded it and tightened it down anyway.

Needless to say that resulted in a new condenser and compressor hose assembly.

Edited: Sun August 22, 2010 at 5:35 PM by SeppW

TRB on Sun August 22, 2010 6:36 PM

Assuming the system is completely clean - Accumulator replaced - 8 ounces of oil for a dual unit system is not enough in my opinion. Cond, Evap, Compressor with be using 7. That leaves 1 ounce for all the lines and rear evap. Compressor will be starving for oil in my opinion.

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

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

Spector on Sun August 22, 2010 7:34 PM

My Macs manual lists 8 oz for front A/C only and 11 oz for front and rear

Cussboy on Sun August 22, 2010 10:38 PM

Quote
Originally posted by: TRB
Assuming the system is completely clean - Accumulator replaced - 8 ounces of oil for a dual unit system is not enough in my opinion. Cond, Evap, Compressor with be using 7. That leaves 1 ounce for all the lines and rear evap. Compressor will be starving for oil in my opinion.

In my case (above) I didn't flush out or drain any of the existing oil. Why I added 8 oz.

TRB on Sun August 22, 2010 11:32 PM

Quote
Originally posted by: Cussboy
Quote
Originally posted by: TRB
Assuming the system is completely clean - Accumulator replaced - 8 ounces of oil for a dual unit system is not enough in my opinion. Cond, Evap, Compressor with be using 7. That leaves 1 ounce for all the lines and rear evap. Compressor will be starving for oil in my opinion.



In my case (above) I didn't flush out or drain any of the existing oil. Why I added 8 oz.

That makes a huge difference! I always work on the assumption that one is starting fresh.



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