A/C confusion.

[NissanNismoZ]

Alright, so we drained everything out of the A/C and checked to see if it could hold pressure. It did. So it's getting warmer out do I figured I'd recharge it. So I did. It's at 25psi (coz it's 70F out)

And..it still will not engage? I can jump it off at the relay (connecting two pins to the relay together) and it engages te compressor, and it comes out ice cold. Alright..so I've confirmed my A/C switch works. I've left it jumped off with a fuse between it. It works how it should, only the A/C light doesn't work. It works how it should, but..should I be convinced its a relay problem? Or something else? Thanks!

[Slartibartfast]

Sure it's not a blown fuse?

 

Pull the relay out and test the coil. Just hook one side to the battery, touch the other, see if it clicks. If it does, set up a voltmeter on the other pins to make sure it's making/breaking the connection. If there's no click, or it doesn't connect up inside, it's your problem.

 

Past that, I guess it could be a bad switch, or a bad wire somewhere.

[unccpathfinder]

Did u pull a vacuum on the system first?...I'm guessing so but there is a high pressure and low pressure switch that will keep the compressor from burning up...my gf's 95 got a leak and I had to replace the drier before it would work right

Edited March 10, 2012 by unccpathfinder

[adamzan]

if the cig lighter fuse is blown the ac won't run.

[NissanNismoZ]

No blown fuses, and yes, we did a vacuum test on it, my bad. Did the test at school for 3 hours (i think it was set to -25psi)

and the gauge never rose.

I will say, since i have it wired across the terminals of where the relay plugs in, my A/C switch works, it just doesnt light up. It's obvious when it's on though.

[unccpathfinder]

Hook it up and see what the high side pressure is...It cuts off somewhere over 400 psi as a safety