Check the temp sensor, and the fan relay.
The normal fan operation and AC are separate, the fan will run with the ac to keep it cooling when you are at a stoplight, or not enough air is flowing through the radiator, that is why it doesn't blow hot at a light.
If it won't run otherwise the main circuit has an issue, it could range from fuse to relay, to sensor( s).
Failed fan motor.
2001 Lincoln ls looking for cooling fan relay
The 2001 Ford Taurus has a cooling fan that is controlled by a relay. This relay is located on the radiator.
on a 1999 jeep grand cherokee where is the coolant fan relay
If the engine fan is working then you could have a defective thermostat or a blown head gasket.
2001 JAGUAR S TYPE 3.0 COOLING FAN KEEP RUNNING
As often as needed.
Jeep Cherokee's have 2 cooling system fans and one climate control fan. One cooling system fan is fan belt driven and the other one is electric and is turned on/off by the engine computer at about 215*. The A/C and heater fan is electric.
it is on the thermostat housing
Make sure that the fuse and sensor for the cooling fan are working. If these are ok then look at the fan motor, it could be bad.
The original equipment for this engine was a clutch-type mechanical cooling fan and not an electrical one. In 1998 the 5.9 L engine with the Max cooling package had an electric fan and of course your Jeep may have been retrofitted at some point with an electric fan but the specific year and engine you mention came with the manual fan.
check the coolant temp. sensor, this sends info to the computer to turn on the cooling fan. Check for other answers for the cooling fan, I posed a answer on how to replace the fan relay with out removing the front facia and bumper