[Archived]

Dan,

If your system is empty that’s a good time to change the compressor oil and fill it to the correct level.

Then when you are done you can pull a vacuum on the system. You will not pull oil out of it when you vacuum it.

The 24 pound amount is what I think Prevost suggests as a very close starting point and you can use the gauges to make the final adjustment. If you are filling the entire system pulling 24 pounds of vapor is a long process so you might want to consider adding liquid at the receiver while the system has a vacuum. Then adjust with vapor at the compressor.

Given the amount of refrigerant and the time you are going to invest I would make sure the seal at the compressor shaft is in good shape and that the system holds vacuum or pressure before filling.

[Reagan]

Thank you Jon, that was helpful. The system is empty of freon but not of oil. Going to leave it as is for the boys in Quebec. For the hose that is leaking, I could not find the end of it on the evaporator side. So I’m going to let them swap it. We scheduled the Quebec run six months ago, so this fits. Our route will be north through Green Bay and on to Sault Ste Marie where we cross the border. Hopefully this is the cool way to go but we can run genny and cruise airs if need.

I think the sequence is

1) drain oil

2) swap hose

3) oil fill

4) vacuum to 29HG

5) fifteen minute wait test

6) charge 134a

[Jerry]

If valves are backseated (normally closed as when you are using AC) will crankcase be pressured?? Why would you open (pull) plug on compressor when you were filling with freon??