Retrofit from R12 to 134A
 

I fitted my '89' from R12 to 134A 36oz 6oz mineral oil. I had to reposition the low side valve just so I could get the gauges on.
Did a deep vac for 1 hour to make sure any air or old R12 was completely sucked out of the system.

Next Like stated above filled with 6 oz of mineral oil and 36 oz 134A
The low side should read around 40 psi and high side 150 psi are good numbers.

Now I can drive my renix comfortably in the hot summer. :chilly:

Hey guy, looks like you know something about this. I was going to post a new thread on charging with a sight glass, which some of us have. It won't let me post anything in the tech section for some reason. You wanna do it?

Good job!:thumbsup:

We have been pushing Freeze 12 at work... non-flammable and has a similar volumetric pressure to R12. The manufacturer says the Freeze 12 is compatible with mineral-based oils in R12 systems.

A little hint... mine has R134A. I don't trust the Freeze 12 yet.