Join Date: Sep 2008
Location: Fruitland Park,Florida
Yes, you can jump the compressor relay to make compressor run. DO THIS ONLY LONG ENOUGH TO GET ENOUGH R134 IN SYSTEM. Compressor will be damaged if run too long with low pressure
Remove compressor relay. It's in the underhood electrical box. Relay terminals should be numbered. You'll find 85, 86, 87, & 30 The terminals you will need to jump are 30 & 87. If you can see the back side of relay box terminal 30 will have a pink wire. This is where relay gets power with key on. Terminal 87 will have a dark green wire. This is the wire that goes to compressor clutch.
So use a jumper wire that connects terminal 30 to terminal 87. turn key on, you should hear compressor clutch engage. Turn key back off. Remove 1 end of jumper wire from relay terminal Set up your charging hose. Crank engine and have it idle. Re connect the end of jumper wire you took off in last step.
Compressor clutch should engage and R134 should go into system. If you have a gauge on your charging hose, charge until you have 40 to 45 psi. If charge doesn't reach that level with 1st can of R134, remove 1 end of jumper. Remove charging hose. And place a new can on charging hose. Put charge hose back on & jump relay again.
If by end of 2nd can, pressure hasn't reached 40- 45 psi, you probably have a leak in system.
Last edited by cocobolo95; 06-10-2019 at 06:15 AM.