Electric Fan Motor

Well assuming its the same layout as my 4.0 , the electric fan gets its signal from the temp sensor on the thermostat housing, the gauge gets its signal from a sending unit on the after left hand side of the engine. the gauge and fan don't share the sensor/sending units. Sounds to me like either your temp sensor (on the t-stat housing) or the relay for it has bit the dust. Eliminate the fan by connecting it directly to the battery, if it spins then you know its good.

Snow... "Don Cherry for Prime Minister"

I already tested the fan & relay, they both are OK. I switched out the Coolant Temperature Sensor today and still no luck.

Now I am wondering now if it could be the thermostat. I know the CTS is in the same housing as the thermostat, but is it upstream of the thermostat?

Tom R.

The fan staying on before total failure sure sounds like a relay problem to me. How did you test it?

If the old fan motor was so worn that it was running slow, it probably smoked the relay.

I switched the relay for the electric fan (40) with the ignition relay (also

"Tom R"

I have not been able to locate the electric fan fuse. I cannot find a fuse labeled for the electric fan either in the relay box next to the battery or in the junction box under the dashboard on the driver's side. Is there another location or does the fan relay share a fuse with something else. BTW, I have a 99 Grand Cherokee.