I have a 2002 Mitsubishi Galant and the radiator fan is not coming on. The car overheats when traveling in town or on inclines. I've checked the fuses for the fan and they are ok. Could this be the engine heat sensor? Or something else. The car cools when I turn the heater on. Please help.
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Re: Cooling Fan not coming on 2002 Mitsubishi Galant
Check the fan itself for free turning--if it grinds or is hard to turn, replace the fan motor. The engine heat sensor reports temperature to the computer which turns on the relay and it turns on the fan motor. If you have A/C, turn it on--that should force the fan on all the time the car is running. If that works, then replace the sensor. If you don't have A/C, take a chance on the sensor--it's not too expensive. Wrap the threads with several turns of teflon tape when installing and don't over-tighten.
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Try replacing your cooling fans since both fans are probably not coming on at the time the a/c is on. If your car uses a single fan, then it must have a hi and lo speed so probably the low works but the high doesn't. If you can barely hear the fan spin then it is probably working in the low speed position and you should check that.
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.
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 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
first that you should check is the coolant level. It may have been caused by low coolant level. Next is the radiator fan if it is working. You can do that by removing the socket of the temperature sensor at the lower radiator hose towards the engine. The fan should turn on. If it does not it may be the relay or the fan. See if you can swap the AC fan relay (assuming the ac fan is running) and the radiator fan relay. If the fan does not turn on you may need to replace it or check the wiring. Check as well for leaks in the hose or the engine. You may just need to tighten the clamps on the hose or you may need to replace the water pump. Check as well the radiator cap as escaping steam from the system contribute to the increase in temperature.
Has it overheated lately?
My wife overheated our Galant and it just stopped working, it cranks but that's it.
I pulled the sparkplugs and found them wrapped in a gewey jelly like substance. Like an oil/antifreeze combo.
I am going to replace the entire motor for $1000 as taking it to the mechanics to theorize and practice may cost more.