2007 379 fan runs all the time

[Rawze]

(07-17-2025 )mikkhh Wrote:  

(07-17-2025 )Rawze Wrote:  On my own truck, the engine fan will come on and just stay on perpetually if the A/C refrigerant pressure is below 50 psi.

There is clear reason for that - if A/C has no cooling then the pressure is going to rise fast causing relief valve on AC compressor to release pressure OR something else will explode leaving behind green cloud of oil and refrigerant, some cars may have relief valve that is one time blow only.

I sure hope that some idiot in some engine company did not have those same idiotic thoughts ...

Sorry,.. but that is the dumbest excuse to turn on the ENGINE FAN that I have ever heard wen the pressure is low. If the pressure is too low, then simply do not run the A/C compressor, and give an A/C pressure fault, and not switch on the engine fan like an idiot!.

Personally, I think they do tit to punish the truck owner,.,.. and force them to fix the A/C system, which is a pure money maker for the OEM when it acts up due to it being designed like s$it on purpose.