On my 2018 F-150, the AC discharge air temp. is about 8 degrees warmer at the driver's side vent closest to the door than the other three vents. The other three vents are within a 1/2 degree of each other and are colder than the vent by the driver side door. The tech. at the Ford dealership that performed the diagnostic could not explain why and said that there Ford does not have a specification on this and there is no industry standard for temp. difference.

Any suggestions on what may be the cause of the temperature difference?

Thank you.

 

all my trucks with ac have always been warmer out the driver side vent than the others.