Over heated , radiator fan not working - 2002 Jeep Grand Cherokee

How does a car radiator fan work?
The engine cooling fan is designed to move air through the radiator when the vehicleis at slower speeds or stopped. This air flow removes heat from the coolant created by the engine using the radiator as a conductor. An engine cooling fan is temperature controlled to only run when needed.26 Jan 2017

How Radiator Cooling Fans Work Explained in Under 5 Minutes

How does radiator fan turn Google Search

Have you waited long enough?
Sometimes it can take 5 -10 minutes before it turns on while using heater.

No rad fine check the fan is working ,either the fan motor ?? connection to the fan motor ?? fuse ?? relay?? or temperature sensor?? any one of these will cause the fault

replace fan switch. depending what make vehicle, it could be located
on the side of radiator, on thermostat housing, on cylinder head.

Turning on the heat removes heat from the engine as it blows it on you. Make sure first that there are no air pockets in your cooling system as that can cause high temp reading and malfunctions in proper fan engagement. If that looks good test your fan, if it is working then test the fan relay, if it is working test the temperature sensor that gives the relay the go ahead to engage the fan.

replace your fan radiator sensor; your fan should come on without the ac anytime the engine heat becomed excessive

Whats happening? Does it over heat? Does the heat work? If not over heating, does the engine run hotter than it did before you noticed the problem?

ANY TIME YOU CHANGE RADIATOR ONCE YOU GET THE NEW RADIATOR IN PLACE.FILL RADIATOR WITH ANTIFREEZE CRANK VECHICLE UNTIL THERMOSTAT OPEN. WHEN YOU TOUCH THE TOP RADIATOR HOSE.IF TOP HOSE HOT THERMOSTAT OPEN.CHECK RADIATOR COOLANT LEVEL IF DROPPED ANY.ADD COOLANT UNTIL LEVEL QUIT DROPPING. WHEN COOLANT LEVEL QUIT DROPPING YOUR COOLANT LEVEL IS CORRECT. NO MORE AIR IN COOLANT SYSTEM OR AROUND COOLANT TEMPERATURE SENSOR COOLANT FAN SHOULD TURN ON ONCE ENGINE GET TO CERTAIN COOLANT TEMPERATURE.SEE IF COOLANT TOO LOW NOT ENOUGH COOLANT REACH COOLANT TEMPERATURE SENSOR. SENSOR CANT TURN ON FANS IF ITS NOT IN HOT COOLANT. WHICH DECREASE ITS RESISTANCE WHICH CLOSE OR GROUND CIRCUIT CAUSING COOLING FANS TURN ON.

I own a 1997 caravan and had the same problem, turns out there is a fan relay switch mounted on the inside of the drivers side frame rail under the battery tray.. cost me 80.00 hope this helps..

its best if you use an AIC controller or change the radiator if the problem presists then it should work fine