Automotive Air Conditioning Information Forum (Archives)

dcg9381 on Tue March 17, 2015 10:54 AM

Year: 88
Make: toyota
Model: 4runner
Engine Size: 2.5L

I need to replace the compressor on a 1988 Toyota 4runner (it blew shaft seal). It was still running R12.
The compressor type is Denso 10P15C.
Various sources indicate that these compressors are pre-filled with oil... Anyone know what type?

dcg9381 on Tue March 17, 2015 11:29 AM

Got an answer from Denso:

Thank you for your interest in our products. This compressor is designed by Denso to be used with either R-12 or R-134A (based on the new seal types), but the lubricant in it will be based off the OE RND6 Mineral Oil, which is the original Toyota design where it used R-12. However, if a retro fit has been done on the vehicle and you are using R-134A then during the manifold swap you dump out the mineral oil and use RND Oil 8 (Toyota's suggested oil) or similar.

The techs at Denso also state that there was a service update bulletin released by Toyota stating that during a retro fit they suggest you do 120% of the oil charge and 93% of refrigerant charge. Now I am not a technician, but the guy I talked to said that this would make sense to any trained mechanic.

TRB on Tue March 17, 2015 11:59 AM

Check with your supplier on the compressor.

I always drain any oil in a compressor and start fresh knowing the type and amount is correct. If running R12 you will use Mineral oil.



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Cussboy on Wed March 18, 2015 2:33 PM

In 2003 I purchased a rebuilt compressor from AMA/ACkits.com for my R-12 1988 Mazda B2200 and it was filled with PAG (tested it at work using FTIR spectroscopy, easy to differentiate), so I flushed it well with mineral-type refrigeration oil and used that (by the way, that lasted me until Oct. 2014).

About 2 months later a co-worker bought a rebuilt compressor from AMA for his R-12 Mazda Protege, and that was filled with mineral-type oil, go figure.

Last October I purchased a replacement new compressor from AMA for that B2200 truck (still R-12); I can't remember, but that may have contained no oil. Anyyway, I added my own mineral-type to that.

So I agree: flush and fill with the oil type that you want to use.