fan question ?

[rdodger]

for the last few days i have been watching my fan and notice that everytime i look at it its always on . is it suppose to always be on at idle ? its cold here -10 celcius roughly . did a datalog and eot and ect seemed ok . coolant was 186 - 190 and oil was 190 -198 .

[rdodger]

anyone have any input ? i know its probably a dumb question but i just dont know .

[deucer]

Fan clutch can be locked up. Unplug the wire going to the fan housing on the upper left hand side then start the engine. If the fan continues to spin with it unplugged most likely your clutch is locked up. Also, behind the fan look and see if the bearing is pooching out the back. If so, again your clutch is toast.

[rdodger]

so i unplugged the only thing i could find . what are the symptoms of a bad clutch ? i read somewhere that it is similar to bad HG's , is this true ? is this an urgent repair ? sorry so many questions , thanx deucer . IMG00191-20110223-1133.jpg.zip

IMG00192-20110223-1133.jpg.zip

[rdodger]

i gotta unzip those pics i guess

[rdodger]

[deucer]

What happened when you unplugged it? Start the truck with its unplugged. If the fan spins then it is likely the clutch locked up.

[rdodger]

i unplugged the harness in the pic and started it again and the fan was still spinning . did i unplug the right one ?

[deucer]

Yes that is the correct plug, but hold off in replacing clutch just yet. With the engine off can you reach in and spin the fan? If so, it may not be bad after all. I believe the fan will have a free spin to it, but it doesn't mean it is actually engaged, meaning spinning at full cool. That is why I'm asking if you can free spin the fan with engine off.

[TerraScaper]

Yep the fan spins with the engine, not quite as fast as the rpm but still enough to take a finger off. I think I read that if your turn on the A/C it will lock the clutch up and you will really hear the turbine.