Year: 1988
Make: jeep
Model: cherokee
Engine Size: 4.0
Refrigerant Type: 134a
i was able to replace the bad heater core without unhooking the ac lines, was a PITA, but i got it installed and everything put back in place But now my ac clutch wont engage. i tried jumping the low pressure switch and nothing happened. i have replaced the ac clutch relay, i am not sure what else to check.
i had the system professionally converted to 134a about 3 month ago and it had been working great all the way up to the heater core job.
is there anything behind the dash or under the hood i might have accidentally disconnected during the heater core job that would keep the compressor clutch from engaging? when the shop charged my system they added a green dye for leak detection. when i did the heater core job i did not see,smell, or hear any leaks.
figured it out. somehow i forgot to reconnect the condenser temp switch attached to the HVAC box, above the pass foot area. kinda behind the catch tray below the glove box.
evap temp sensor
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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......
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