No cab fan but works on bunk heater


Well-Known Member
My 2007 9400I stopped blowing air out the front vents yesterday all of a sudden. I replaced the control panel on the dash with a new one to test, and nothing, however my bunk heater blows just fine. I think I had this problem once before but can't remember how I fixed it. No matter whether on defrost or floor heat, no fan. Any ideas??


** Commie Express **
You need to pull the connection off the fan and put a meter on it. Turn fan on high and see if your reading 12 volts. If you are then the fan is bad.


Well-Known Member
there is only one fan I believe and it blows in the bunk. I think there is a rheostat in the same compartment as the fan under the seat. I changed that as well last year. maybe it went bad.


Well-Known Member
check with the usual suspects, blown fuse, loose wire, if the resistor in the circuit is bad, usually you get high speed fan only.

given how all trucks take a pounding, that resistor can be broken.