Toyota MR2 Message Board - View Single Post - New A/C compressor R-12 to R-134 Ideas?

alamostation · 05-25-2007, 07:12 AM

I bought my 87 MR2 with a siezed A/C compressor and just bought a rebuilt one along with a receiver/dryer. I've worked on lots of cars before, but never on A/C. For starters, I don't know if I still have the R-12 in the system. Before I spend money to have it removed, how do I tell if it is still there?

Next question. I have access to gages and maybe a vacuum pump. How do you flush the system to get rid of the old oil? Every thing I have read says to do it, it just doesn't say how.

Lastly, do I really need to replace all the o-rings throughout the system? Some people say yes some say no. I would love to hear from anyone who has experience either way.

05-25-2007, 07:12 AM	#1 (permalink)
alamostation Benevelent Mad Scientist Join Date: Apr 2007 Posts: 28 Thanks: 4 Thanked 0 Times in 0 Posts iTrader Rating: (0/0% )	New A/C compressor R-12 to R-134 Ideas? I bought my 87 MR2 with a siezed A/C compressor and just bought a rebuilt one along with a receiver/dryer. I've worked on lots of cars before, but never on A/C. For starters, I don't know if I still have the R-12 in the system. Before I spend money to have it removed, how do I tell if it is still there? Next question. I have access to gages and maybe a vacuum pump. How do you flush the system to get rid of the old oil? Every thing I have read says to do it, it just doesn't say how. Lastly, do I really need to replace all the o-rings throughout the system? Some people say yes some say no. I would love to hear from anyone who has experience either way.