I am turning to the experts here because I'm banging my head against the wall with the ac system in the truck.
Some backstory:
Had an ac leak at the rear evaporator (no surprise with the age of the truck).
Replaced the rear lines and evaporator = leak gone.
Had the system recharged to spec'd pressures - still no leak.
Replaced the high pressure sensor, ac compressor relay, ambient temp sensor and the evap temp sensor.
Intermittent cooling persisted so I pulled the relay and jumped it. Compressor comes on and stays on so I replaced the relay.
AC runs cold for 15 mins or so after start up and then goes warm. Occasionally, it will come back on but it didn't seem to have method to its madness.
Until I noticed that when the volts drop off to 12~ at highway speeds, that is when the ac compressor kicks off and the air goes to ambient temp from the vents.
My troubleshooting mind points me to the compressor clutch but I really wanted to see what you all thought...
Thanks in advance.
Some backstory:
Had an ac leak at the rear evaporator (no surprise with the age of the truck).
Replaced the rear lines and evaporator = leak gone.
Had the system recharged to spec'd pressures - still no leak.
Replaced the high pressure sensor, ac compressor relay, ambient temp sensor and the evap temp sensor.
Intermittent cooling persisted so I pulled the relay and jumped it. Compressor comes on and stays on so I replaced the relay.
AC runs cold for 15 mins or so after start up and then goes warm. Occasionally, it will come back on but it didn't seem to have method to its madness.
Until I noticed that when the volts drop off to 12~ at highway speeds, that is when the ac compressor kicks off and the air goes to ambient temp from the vents.
My troubleshooting mind points me to the compressor clutch but I really wanted to see what you all thought...
Thanks in advance.