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1994 - New Compressor, Clutch Not Connecting

07-26-2013, 08:50 PM
I just got a new compressor and everything was working fine. Yesterday I started the car, the blower was fine but NO cold air. I checked the charge and it is fine. Heard that it might be the relay?

Anyone want to give it a shot and thanks!:banghead:

07-26-2013, 11:01 PM
'94 H cars (as is yours) are known for relay contact issues-- tap on relay- usually 2nd from left on relay center on firewall- remove beautification panel to see relay center- if tapping on relay makes compressor come on- then replace it-- seen about 2 dozen H car relays act like this...

Tech II
07-26-2013, 11:02 PM
How did you check the charge?

What is the low and high side pressures with the compressor not running?

On a cold engine, pressures should approx be the same as the ambient air, i.e., if the outside air is 70F, both pressures should be around 70PSI......if much less you have a leak......

If pressures are ok, remove the 2 wire harness from the pressure cycling switch on the accumulator......turn car and A/C on......now jumper the two wire harness......if the compressor starts, and low side pressure does not drop below 28-30 psi, need a new switch.....if it drops below that, you need more refrigerant.....

Also, if the compressor was short cycling due to low refrigerant, a code 66 may be set in the ECM, and it is disabling the compressor....

07-27-2013, 08:08 AM
Heard that it might be the relay

You can switch relays in the center on the firewall. Most of them are single pole single throw like the compressor relay; the horn relay is in there and it's a good one to switch.

Just check the part number. Then if it works and the horn quits working, e.g., you know it's the relay.

11-01-2013, 10:03 PM
Hopefully you won't have to go this far but I had a blown fuse that feeds the power to the compressor clutch. I caused it. On my car it was located in a rare place deep above the right passengers foot. It's amazing that the PCM can somewhat detect these blown fuses with a professional code reader.

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