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New Compressor & Accum - How much oil?

wgabriel10 on Mon September 13, 2010 9:02 PM User is offline

Year: 2004
Make: Chev
Model: S10 Blazer
Engine Size: 4.3L
Refrigerant Type: R134
Ambient Temp: na
Pressure Low: na
Pressure High: na
Country of Origin: United States

I will be replacing the original Delphi 8284 compressor (HT6 type) on my 2004 S10 Blazer this next Friday due to a defective Competere clutch. Clutch wants to "grab" even when a/c is turned off. Essentially lost its gap; however, pulling it out a bit results in clutch plate just wanting to wobble. Have read that this is caused by the failure of some "torsional component" in the clutch. Original compressor still seems to run fine, but has 6 years of duty. Will be replacing the accumulator and OT as well. Replacement components are from AMA -- using the recommended Valeo 10000324 (AMA part no) compressor/clutch as well as all the other goodies.

New Valeo compressor calls for 180 CC of oil (6 fl oz). The question I have is: How much oil do I add to the system since I know some is retained in remaining components? I do not know what the original total oil charge was in the system and cannot find that information. I've never found any info so far confirming whether the total system OEM charge is just what the compressor calls for, or is it that amount plus "some more", whatever that may be.

Should I just use the "drain compressor and accumulator oil, measure it, and add this amount + 2 oz" as I have seen in other posts? That seems to fit pretty well since I have seen information saying that the condenser and evaporator "retain" around 1-1/2 oz; however, I have no verification of that. I could also see factoring in the 6 oz Valeo spec into the calculation as well. I figure I need to have a minimum of 6 oz of total oil in any event.

Or, is there a different/better alternative method?

And, depending on the total mount, I would plan to split the oil charge between compresson and accumulator.

Thanks a bunch,


TRB on Mon September 13, 2010 9:08 PM User is offlineView users profile

Application Specification
Metric - English

Accumulator Replacement 60 ml* 2 oz*
* Add PAG equal to the amount of oil drained from the old accumulator plus the additional specified amount.

Compressor Replacement 60 ml1 2 oz1
The Delphi Compressor HT6 service compressor is shipped dry.

Condenser Replacement 30 ml1 1 oz1
Evaporator Replacement 90 ml1 3 oz1
Total System PAG Oil Capacity (HT6)
236 ml 8 oz
Refrigerant Charge
0.80 kg 1.75 lb
1 If more than the specified amount of PAG oil was drained from a component, add the equal amount drained.


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

wgabriel10 on Mon September 13, 2010 10:15 PM User is offline

Super, TRB. I surely appreciate the quick answer and all the data. Now I feel better about what to do, and it makes sense from an engineering standpoint.

I've worked with home a/c systems with my Dad years ago before I went to college - R22 stuff. Have performed additions of refrigerant to vehicle systems over the years and a few other things, but never replaced any major components. Guess I will be playing with hydraulic fittings and o-rings rather than silver solder for this job! LOL!

I even made up a procedure to use to keep myself from forgetting some things that would be routine for those that do this ofter and doing them in some logical order. For example, on my Blazer you have to remove the accumulator to get to the OT; do that replacement and then put in new accumulator. Maybe I should upload it for others in case someone is interested after I verify it works correctly. Could be adapted for other vehicles easily.

Again, thanks for the help!


GM Tech on Mon September 13, 2010 11:37 PM User is offline

you must have a '96 or newer Blazer-- '94s used and R-4 compressor...

The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

wgabriel10 on Tue September 14, 2010 6:21 PM User is offline

Hiya GM Tech -- Not sure where you picked up the "'94" reference. I thought I had typed 2004 everywhere I referenced the model year. Sorry if I boo-boo'd somewhere.

It is a 2004, and the original compressor that I will be removing is a Delphi "8284". Complete model number is 15068284 from the label. From all I have seen this is an HT6 type, but correct me if I am wrong. Has a Competere-brand clutch which crapped out.

The 10000324 Valero compressor that came in from AMA looks to fit, both in mounting holes as well as pulley OD.

I have an old 1983 GMC High Sierra truck that needs a whole new a/c system in it too. Am trying to remember if that one usef an R4 compressor. I remember it is one of the "pancake" types - short, bigger around thing!

If you have any other tips to offer on replacing the compressor, accumulator, and orifice tube, I am all ears. Have never taken apart any of the fittings used in vehicle a/c systems so that will be a new experience for sure!

Thanks -- Watson

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