Does the engine fan run all the time on a 2000 grand cherokee

probable a bad engine control computer if there is no code. could also be bad crankshaft positioning sensor, or camshaft positioning sensor.

follow wiring harness toward fire wall there should be a plug , toy need the fan sensor for time being unplug it bwhen not in use

That is normal, the system is designed this way to prevent the overheating of the engine's head when you shut down the engine without allowing it to cool itself to an acceptable temperature.

Replace the cooling fan clutch. It is the silverish round device that the fan attaches to. This component is heat sensitive and will only function correctly when hot. They are known to fail over time. Also inspect the radiator for good coolant flow. DO THIS when engine is cold only or have a shop check it out for you.

A relay for the fan in the engine compartment of the heater/AC fan ? The relay for the engine fan is on the right fenderwell by the battery and has a black cover over it. Lift the cover and you will see on the underside of the cover which relay is for the engine fan.

200 degrees, cooling fan comes on around 222 degrees

the fan thermostat needs to be replaced, but running all the time will not hurt anything.

yes it is and it is a real sob to change.

usually the engine relay or cooling fan relay..!

you will need to change your fan relay which is located behind the front bumper on the passenger side