Originally Posted by AR Devinci
My 2005 DeVinci has been wanting to over-temp.
Have run through most frequently discussed solutions.
Wondering if anyone has had heating engine problem caused by hydraulic motor allowing fan to slow down as system heats up.
Have installed a bypass switch for controller which works fine.
However would like to determine cause of heating problem.
Once I need to use bypass, which may occur after 70 or 80 miles of driving,
I need to operate by pass every 20 or thirty miles.
Are you sure your engine is overheating? What engine temps are you seeing? What trans temps are you seeing? Do you have Silverleaf or are you using the dash gauge for monitoring the temps? What engine do you have? Some use different sensors for dash gauge and ECM, some use the same sensor. Has the fan controller been replaced in the past?
This information might help locate your problem,