Question about 2000 Pontiac Grand Am GT

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Coolant fans not coming on

Engine runs hot

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Coolant fan sensor

Posted on Dec 03, 2012

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Posted on Jan 02, 2017

pugwash814
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SOURCE: what does a engine coolant temp sensor do?

yes some coolant sensors do, others just monitor the coolant temp,, the fan switch should be mounted on the radiator, " a plug with 2 electrical terminals on it " and can be tested by bridging the contacts with a pin and the fan should run if not the switch is at fault..

Posted on Nov 07, 2009

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I have a 2002 Mitsubishi Diamante the coolant fan will not come on. The gage says it isn't hot but it smells hot. What could be the problem ?


check fuses and relays -engines smells hot [all engines put out heat and smell hot ]could be nothing the engine could be running correctly or test the temperature sensor ,fan motors and fan circuit --if smells hot because of leak look for leak have coolant system pressure tested

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The cooling fan isn't causing the engine to run hot, it's electrical and cannot heat an engine. It is turning on in response to your engine running hot. Check coolant level and age, if it's still running hot then check the thermostat - it could be stuck closed. If the thermostat is fine and coolant level is full, it could be partially clogged radiator or head gasket problem (a sure sign of bad head gasket is that your coolant keeps disappearing with no leaks).

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Generally when there is 2 electric fans one is controlled by the engine control module and the coolant temp sensor for maintaining engine temperature and the other is controlled by the air conditioning control module used when the a/c is in operation. If engine temp starts to get near the red then both fans come on at high speed. If you want to make sure the other fan works though then just put 12vdc to it directly and see if spins. For it running hot I would replace the thermostat if it has never been done and replace the coolant. Put in a 50/50 mix.

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High coolant temp


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Engine fan won't come on


IF COOLANT FAN FUSE AND RELAY OKAY.HOT WIRE COOLANT FAN TO SEE IF FAN MOTOR OKAY.IF FAN MOTOR OKAY.THE ENGINE COOLANT TEMPERATURE SENSOR MORE LIKELY BAD.THE ENGINE COOLANT SENSOR WHEN ENGINE COOLANT GETS HOT IT CAUSES ENGINE COOLANT TEMPERATURE RESISTANCE TO DECREASE CAUSE COMPLETE CIRCUIT IN WHICH POWER FROM PCM TO ECT SENSOR WILL SENT POWER TO COOLANT FAN RELAY THEN CAUSE COOLANT FAN TO TURN ON. HAVE ECT SENSOR OR ENGINE COOLANT TEMPERATURE SENSOR CHECK USING CODE SCANNER TO MAKE SURE ITS WORKING BEFORE SPENDING EXCESS MONEY.

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1 Answer

Car ran hot now it wont start at all


THE ENGINE IT WONT CRANK IF OVER HEATED CHECK COOLANT LEVEL IF LOW ADD COOLANT.REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.IF ENGINE STILL OVERHEAT AT A STANDSTILL OR IN A LONG LINE OF SLOW MOVING TRAFFIC.COOLANT FAN SHOULD COME ON.IF ENGINE OVERHEAT CHECK TO SEE IF COOLANT TURNS ON IF NO.CHECK COOLANT FAN FUSE AND RELAY.IFBOTH OKAY HOTWIRE COOLANT FAN TO SEE IF FAN RUNS IF NO REPLACE COOLANT FAN MOTOR. IF FAN RUNS PROBLEM COULD BE PCM OR THE COOLANT TEMPERATURE SENSOR FAULTY OR DAMAGE WIRE CONNECTOR TO COOLANT FAN.USE A CODE SCANNER TO LOOK FOR PCM OR ECT FAULTS.IF EVERY THING CHECK OUT OKAY LOOK AT ENGINE OIL DIP STICK.IF IT LOOKS LIGHT BROWN OR LIKE MILK SHAKE YOUR HEAD GASKET BLOWN.MAKE SURE YOU HAVE 50/50 ANTIFREEZE AND WATER TO ENGINE TO HELP RAISE BOILING POINT.WHEN OUTSIDE TEMPERATURES HOT.

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My car is overhit,the thermo in new,the bleed is than but stil overhit


OVER HEATING AT A STANDSTILL PROBABLY COOLANT FAN NOT COMING ON.CHECK COOLANT FAN FUSE/RELAY.IF BOTH GOOD COOLANT TEMPERATURE SENSOR FAULTY.HOT WIRE COOLANT FAN.NO RUN REPLACE COOLANT FAN MOTOR.IF FAN MOTOR RUN.FAULT IN FAN MOTOR WIRE CONNECTOR.IF ALL IS GOOD YOU COULD HAVE A LEAKING HEAD GASKET.CHECK ENGINE OIL LOOK LIKE MILK SHAKE HEAD GASKET BLOWN.

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1 Answer

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sound like coolant temperature sensor is open or not working.scan it to see when engine get operating temperature when coolant temperature get 190 degrees the coolant temp sensor should show 190 degrees if it shows 80 degrees or lower it not working replace it.the coolant sensor control coolant fan.when it gets hot it resistance changes or lower.the pcm grounds it .then cooling fans will run.

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