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Where's the AC oil? S90-V90

posted by  chris herbst on  Wed Feb 26 16:41 CST 2003
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last visit: Mon Oct 20 20:32 CST 2014
[RELATED]

Actually, I'm pretty sure that most (or all) of the factory filled 134a systems are PAG oil, not ester oil. But I didn't want to suggest that in case I was mistaken, since A/C work and parts can be pretty expensive even for a DIY job.

Although the ester oil should mostly work with PAG oil, it is ideal to keep the same oil in the system.

Additionally, the PAG oil is more hygroscopic than is ester oil. Therefore, it acquires more moisture than does ester oil, if the system sits open for too long.

Most factory 134a systems are PAG oil equipped. The 850/70/etc is. I think the 240/940/960 are as well (the ones coming from the factory with 134a).

That, of course, doesn't go for the converted cars. Those would be ester oil systems.

Please correct me if I'm wrong... I could be. A/C is like, my thing though. I like it and I do a lot of A/C work (multiple makes/models) including Volvo. I use a book to reference it, but I want to make sure I've got it right!
--
chris herbst, near chicago






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