Still working on the A/C...

It will not get sucked out. Ad a ounce ot two if it make you feel better but do not ad full amount as too much can ruin compressor.

----------------- The SnoMan

Agreed. I also read today that PAG oil is hygroscopic - that it absorbs moisture. When moisture combines with 134a, it forms hydrochloric acid. Conclusion: good thing to have a dry system! Perhaps draining the old oil from the compressor and replacing it with new might not be a bad idea? (especially if I'm too lazy to replace the accumulator/dryer?) And would low viscocity oil be preferable over the 150 oil? And what IS ester oil?

-THANKS AGA> >

I think it's very self defeating to do all that work and then (through laziness) NOT change the drier.....

Yeah... well all I really did was replace the schreader valves, put on a new condensor I paid $10 bucks for on ebay and vacuum it down. I dont really even know if the compressor is going to work. I dont want to use a perfectly new dryer if this isnt even going to work. If I replace the compressor - definately, I'll replace the dryer.

-WaV

Ritz wrote:

*shrug*

Pay now or pay later. Better to just do it right the first time.

Cheers,

wavy wrote:

When you vacum it down and hold it for a while it will pull the moisture out. PAG is poly-aklylene glycol (R134a will not mix well with mineral oil) and Ester il (polyol ester) is a synthetic lube that will work with R134a too. Because PAG is glycol based (like anitfreeze and brake fluid) it will aborb moisture if given a chance too.

----------------- The SnoMan

Not if you don't change the receiver/drier. Once the dessicant in the drier is saturated with moisture, it becomes useless. Taking it down to a vacuum MAY help a little, but it's not going to solve the problem.

It is good practice to change the drier any time you've got to expose the system to the atmosphere (such as changing the condenser).

Correct, plus what happens if that old dessicant bag falls appart?

Wavy you can get much better help by going to a auto ac forum because it will have more knowledgeable people in ac service and less average joes giving you lacking or bad advice.

Research your questions before you ask something that might have already answered and be sure to give them as much detail in your first post when you do post there.

Somewhat true but if you oull down and hold a good vacum for a while it will remove a lot of the moisture.

No aurguement here, especaily with a compressor change that has trashed out because it acts as a filter of sorts to and replacing it gets the trash out of the system.

----------------- The SnoMan

No always true. You get good advise where you can find it just like repair shops because not all of them really know what they are doing as I have seen some "dealers" mess things up.

----------------- The SnoMan