Quote:
Originally Posted by jeet
Freightliner century class engine fan stays on all the time. When ignition is turned on, the screen in dash will show active fault. " AC Controller No Response 190 s 270 7 ". The ac on this truck does not work ( leak some where in ac condensor ). Any guess what might be causing this ? help is appericiated in advance. Thanks...
I would call my dealer and ask for a fault code description. it's possible that the a/c fault is causing a loss of head pressure signal, which might keep the fan on... even if the a/c system is turned off. Or, the a/c hp switch could be bad... keeping the fan on. or, wiring for the switch... if that circuit opens, the fan stays on.
Or, the fan solenoid could be bad... or its ground... or live. Air supply to the solenoid? Engine temp input? Oil temp input? in some, even ambient air input can turn on the fan... dash override switch bypasses fan controls, it could be bad. maybe the fan clutch is seized on... is it a Kysor?
Does the fan spin free when the key switch is off? ...how about when the key is on (engine not running)?