You are here:

Truck Repair/n14 cummins engine fan wont shut off


temp. is 180. fan solenoid is working. I am wondering it ac psi switch is working, how to check. I let all Freon out, still fan is on. I had trouble with oil psi sender still not working. cant find out why.thats been 3-4 month ago I run this truck every week runs great. wonder if I have wire harness problem.

Might also check for a control module that runs it. On Volvo trucks there is a small square module that controls the fan circuit in the engine compartment. I'm taking it that you test the fan solenoid by turning the key on and listening to it kick. No chance of the clutch being stuck is what i'm getting too. If it's in the a/c system it would be in the on/off switch not in the pressure switch. If you want to check your pressure switches. You can bypass them by jumping the plug with a paperclip.

Truck Repair

All Answers

Ask Experts


Jeff Drumm


I Can answer any question pertaining to semi trucks and trailers. Have no experience in the automotive field so not able to help in that area.


My experiences in Semi Trucks is. I own my own truck and i presntly maintain a 80 truck fleet. Can handle any questions pertaining to a truck have tore apart and rebuilt every aspect on them. Fleet I deal with is Mainly Volvo trucks and a handful of freightliners. Work on automated transmissions on a daily basis along with carrier apu's. With engines my specialty is the 60 series Detroit but do work on the cummins isx the n-14 and the ism. and also the Volvo engines.

Have a College Degree from university of northwestern ohio in diesel and agriculture mechanics. Have 10 years behind the wheel driving a truck and 4 years working on trucks full time. Also have grown up on a farm so have been tinkering on trucks and tractors all my life.

Awards and Honors
I've gone through online schooling and have received certificates from webb wheel, Timken and Volvo academy.

©2017 All rights reserved.