Ac only working while driving

jason6541 · Jun 28, 2021

jason6541 said: ↑

Old post, engine fan will come on when psi inside gets to high to get rid of latent heat in the system.
If you have a fan override switch turn it on
It should cool down.
Check HCAV filters make sure clean.
Evaporator drains are clear snd functional
Be sure evaporator coils are clean behind filters.
Without being there and not having a set of gauges to look at. I am going to guess and it could be several things
Over or under charged
Expansion valve or valves are bad
They act like a thermostat regulating the flow of Freon thru the system.
Change drier when you open system for any reason
Click to expand...

also compressor could be nearing end of life. Without gauges and witnessing the readings it’s all speculative on my part

bavarian · Jul 2, 2021

I got my my Cat C13 reprogrammed from an aftermarket shop. I'm happy with the performance but ever since, the engine fan won't come on for the A/C in slow traffic or when parked. An other shop figured out, the ECM doesn't recognize the A/C and won't turn the fan on. I run it manually when needed.

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