A/C diagnostic

[87 national]

I have been having trouble with my a/c my compressor clutch will not kick. I replaced the relay with another and still nothing. I checked for power to the relay two pins have power, when i turn the ac on the idle increases, but still no power to the compressor. I check cont between the relay and the wire on the compressor plug had it. So i decided to test relay refer to pictures. I sent a 12v current to the arrows in red the yellow one goes to iac i am guessing to raise the idle and that received 12v but the one in blue is the one that goes to the compressor and that gets no juice on both relay. Could i have two bad relays or something in my system is blowing them?

 

[TIMS87GN]

Have you checked your freon charge? If the pressure is low the compressor won't engage because of the low pressure switch. Sounds like you may be low on freon.

 

[87 national]

Jumped low pressure switch. I think it a relay problem because both pins should get electric correct?

 

[87 national]

Anyone?

 

[1fast6]

have you jumped power at the clutch with key on engine off to see if clutch engages?