I have bypassed the low presuure swicth, checked all fuses and relays, bypassed the clutch relay and the compessor runs. I suspect a problem with the in dash controls. If this is the case how do you remove the trim around the heater,A,C,radio controles?
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Re: 1997, cherokee,4L, A/C compressoer will not run
There are screws in dash cover on lower edge and possibly two more over speedometer/ gauge opening. If you have a tilt wheel, lower it. Pull gently from bottom and anywhere its hanging up look for a screw. Some attaching points are pull out clips with no screws. You have to use some force when pulling but don't be an animal. Sub components usually have easily accessable hardware. Control has lots of wires and vacuum hoses on back be careful not to pull any off while checking. Are you sure relay is good???
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great question the ASD, a key relay to sustained starts and running.
and told the engine, bravo !!!
post the DTC error code.
The ASD can drop out for many reasons, post all DTC codes
and never forget, crank for 5 seconds then look for DTCs
Looks like the low pressure switch gets power from a 10amp ac fuse. Power then goes to the ac relay which is powered on by the ac heat controller on the dash. Power then goes thru the high pressure switch to the compressor. The ac relay is grounded to the body. Do you have power on the lite and dark green wires going into the relay and is it grounded ?
Your clutch is not being energized - ergo the compressor will not run - no AC. Get yourself a schematic so you can intelligently trace all of the wiring to your clutch and locate the source of the problem. Afterthought - check out the thermostat setting? That is in series with clutch winding and .............................
as one of the steps to repair you might want to check the a/c cluth relay located in the Power Distribution Center. That is a box located behind the battery. Look for the right label on the inside of the PDC box cover. Check that that the relay is ok. If it is ok check voltage in the terminals that receive the relay (the terminals that power the relay coil) while the ignition key is in the on position and the a/c switch is on and the blower motor is on. If there is voltage there, then check for voltage in the terminal receiving the relay that powers the a/c clutch. If there is voltage there, Check for voltage in the cluch conector, if there is voltage there, then the clutch itself might be bad. If there is no voltage in the PDC terminals that energize the relay coil and/or the clutch, then the wiring should be checked, including the fuses.
how did you jump the fuel pump relay, by bypassing the relay or by applying power to contact that closes the relay? If you bypassed the relay completely you need to b ench test the relay you can do this easily by using any 12v dc power source. If you tested the fuel pump relay by applying power to the relay and the pump run and developed pressure. I suspect a wiring or ground issue. Good luck
The air gap may be too wide between the clutch disc and plate. It usually happens from wear. You can test this possibility by engaging the clutch electrically as you have done and then push on the disc slightly with the handle of a hammer or screwdriver. Be careful not to get your hand or fingers too close while the engine is running. Basically you are helping the magnetic field pull the disc in. I hope this helps.