2007 379 fan runs all the time

[mikkhh]

(Yesterday )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.