Dragging up an older thread...
Im having similar issue - AC doesn't come on..
I've done a bit of troubleshooting as follows:
First checked the AC Fuse, good
Then checked the AC Relay, I can power up the relay and hear it 'click' and I can check continuity across the relay after power and circuit to compressor functions.
Checked the compressor solenoid by jumping the the AC Relay Socket, compressor engages.
Checked power on the AC Relay Socket and it is dead on all conditions.
So, checked the external temp sensor @ front bumper by looking at readout on the screen of the external air temp. It appears to be functional and raises and falls consistent with surrounding air temps. But I didn't pull it and check resistance.
Then checked the internal cabin air temp sensor behind the small vent at driver right knee. Pulled the sensor, cleaned with MAF spray. replaced.
No difference. The 'system' senses the need for AC b/c the recirc will come on to recirculate internal air and the fan will gradually bump up until it is full, but no cool air. So I'm looking at either 1 more sensor down in the console on the condenser, the sun sensor on the passenger dash, or at the control unit.
Does anyone see an issue with the troubleshooting as I've laid it out or have experience with this to point more toward the condenser sensor, sun sensor, or control unit? Basically the system is sensing the need for AC but there is no 'on' signal getting to the compressor. TIA for suggestions.
280k miles, 16g BNR, CryoTune
Motor rebuild @ 250k with orig turbo. Had a cracked exhaust valve.