Cooling Fan not coming on 2002 Mitsubishi Galant

The fans should run whenever the AC is on. But if it's off, the fan should only run when the computer thinks the temp is too high

Are your cooling fans operating?

Try swapping out the fan relay. It may be crapping out.

I think your radiator cooling fan is not coming on when the a/c compressor kicks on. Check the cooling fan relays, low and high speed, and the fan too.

Sounds like the radiator fan isn't coming on. You don't need the fan on when you're moving, cause air is blowing into the radiator, but sitting still you need the fan or it'll overheat. This makes me think the fan isn't coming on.

The cooling fan motor may be bad. When you turn the air conditioner on the fans should automatically come on. This will tell you if the moter is good. Check the relay for the cooling fan motor as well. I hope this helped and good luck.

ENGINE NOT GOING TO START IF GET TOO HOT FIRST THING I WOULD REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP THEN ADD COOLANT UNTIL COOLANT LEVEL CORRECT THATS WHEN THERMOSTAT OPEN UP AND TOP HOSE HOT.CHECK FOR LEAKING RADIATOR HOSES CHECK TOP RADIATOR HOSE CHECK BOTTOM RADIATOR HOSE.CHECK FOR LEAKS AROUND THE RADIATOR LOOK DOWN BELOW COOLANTS FANS CHECK FOR LEAKS AT RADIATOR CORES OR LEAKS AT THE RADIATOR PLASTIC SIDE CONTAINERS. CHECK FOR LEAKS AT WATER PUMP WEEP HOLE AND CHECK FOR LEAKS AT THE HEATER HOSES AROUND ENGINE BLOCK TO THE HEATER CORE HOSES. THERE IS A REASON CAR OVERHEAT.IF CAR OVERHEAT WHILE DRIVING YOU HAVE FAULTY THERMOSTAT OR LEAKING OUT COOLANT OR BLOWN HEAD GASKET.IF ENGINE OVER HEAT WHILE SITTING DURING A LONG IDLING PERIOD.YOU COULD HAVE FAULTY COOLANT TEMPERATURE SENSOR OR FAULTY COOLING FAN FUSE OR RELAY.HOT WIRE COOLANT TO SEE IF IT RUNS IF NO REPLACE FAN MOTOR. IF YES FAN MOTOR COULD HAVE FAULTY WIRE OR PCM FAILURE. CHECK ENGINE CRANKCASE IF OIL LOOKS LIKE MILK SHAKE ENGINE HEAD GASKET LEAKING.

yes, one is a/c cooling fan, check fuses @ relays one is engine cooling fan. the a/c cooling fan should come on when a/c is turned on inside vehicle

yes the head gaskets leaking on modern aluminum head engines is all to common. never overheat them, if they start to get hot shut it down and find out why, it can of course be the fans and plugged radiators or faulty thermostats but sounds like in your case the head gasket is leaking and combustion gas is entering the cooling system and this causes an overheat

The temperature sensor for the radiator cooling fan is probably bad. When you turn the AC on, it overrides the sensor and the fan runs all the time while the AC compressor is engaged.