What do you mean 50 percent? The fact that the fans run when you unplug the temp sensor is proof the system is working correctly. Nothing will be accomplished by replacing fans that are working. The engine computer normally turns the fan on at 212 degrees and off at 198 degrees. When the sensor is disconnected, the computer doesn't know coolant temperature so it turns the fan on as a precaution in case the engine is overheating.
My guess is you don't have a problem.
Caradiodoc
Tuesday, April 14th, 2009 AT 1:05 AM