Hey guys there is a very small amount of R-12 left in my system..So my compressors' magnetic clutch will not turn on. Is there any way to trick my pressure sensor to see if it works? Could I put a few psi of air in the system to see it the compressor turns on (like 10Psi?)


Thanks in advance guys.

 

Introducing air into the system is a BAD IDEA. If you want to test it out go to the parts store and get a can on freeze 12 to put in it.

 

 

Air is a bad idea. It can't condense and drives the pressure sky high. (Hence why vacuuming the system for 30-60 minutes is a GREAT idea when opening up the system or converting)


I wouldn't put any Freeze12 in there if you still have R-12 left. Particularly if you are going to be putting more R-12 in there. Freeze12 is 80% R134a which isn't compatible with the R-12 mineral oil currently in the system.

 

Just unplug the plug in this pic and jump the two connectors inside it. As mentioned earlier, don't do it for more than a second or two.

 

do as titan said, jumper the connector, but dont do this to get the a/c system to work, its for testing only, its a low pressure switch to turn the compressor clutch off when the system is low, and running the system with low charge could mean the life of your compressor.