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There are a few potential reasons why your engine fans may be running all the time after you turn off your 2006 Mazda 6:
Coolant temperature sensor: The coolant temperature sensor may be malfunctioning and sending incorrect signals to the engine control module. As a result, the fans may run continuously to try and keep the engine cool.
Faulty fan relay: The fan relay controls when the fans turn on and off. If the relay is faulty, it can cause the fans to run all the time.
Failed Engine Control Module (ECM): The Engine Control Module (ECM) controls the engine fans and if it fails it can cause the fans to run constantly.
Leak in the cooling system: A leak in the cooling system can cause the engine to overheat, which can cause the fans to run all the time.
Stuck fan clutch: A fan clutch that is stuck in the "on" position can cause the fans to run all the time.
It's best to have a professional mechanic diagnose the issue. They will be able to identify the specific cause of the problem and make the necessary repairs. It is also important to keep an eye on the temperature gauge, if it's showing a high temperature and the fans are running all the time, it's important to stop the car as soon as possible and have it checked by a professional to avoid further damage.
Many engine control system faults can cause the radiator cooling fan to come on and run non-stop. Also, if your A/C is on or if you have your heating and cooling controls in DEFROST mode, this can cause the radiator cooling fan to come on (normal operation). Or there could be a cooling fan circuit malfunction (like a stuck relay) causing this to happen.
Check to see what mode your climate controls are in. If the climate controls are not in A/C or DEFROST modes, then you should have your engine control system properly diagnosed to determine the cause of the radiator fan being on continuously.
Also, if the Check Engine light is on, this is a clue that the engine control system is malfunctioning.
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.
if the fans were working good before. check the fuses or fan relay in fuse box. if ok. see if power is getting to fan( car on engine off ) at the fan connection. to test fans if need be. run a wire from positive on fan motor to positive on battery, then ground other connection to a suitable ground or the negative post on battery. if the fans are ok. here are a few causes--- defective thermostat stuck open ( engine does not get hot enough to turn fan on ) . a failed fan relay, or a bad fan motor! or engine coolant tempurature sensor is bad. have a good day !!
CHECK FOR LOW COOLANT.YOUR CLUTCH FAN COULD BE BAD IT CAUSING ENGINE TO OVERHEAT.WHEN ENGINE GET HOT THE SILICONE OIL IN FAN CLUTCH GET HOT CAUSE THERMOSTAT SPRING EXPAND CAUSE FAN CLUTCH TO LOCK IN TURN FAST WITH ENGINE TO COOL OFF ENGINE. IF FAN IS WOBBLY OR FREEWHEELING ITS BAD.
LOOK UNDER THE HOOD IN THE ENGINE COMPARTMENT. ON DRIVER SIDE FOR FUSE BOX.LOOK ON FUSE BOX COVER IT HAS LOCATION FOR FUSES AND RELAYS.MOST TIME PROBLEM WITH COOLING FAN CIRCUIT WILL CAUSE CHECK ENGINE LIGHT.BAD ENGINE COOLANT TEMPERATURE SENSOR WILL CAUSE COOLANT FANS NOT TO TURN CAUSE OVERHEATING. ON.REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP SEE IF STOP OVER HEATING. IF ALL LOOKS GOOD HOTWIRE COOLANT FANS MAKE SURE FAN MOTORS ARE GOOD AND NO SHORTS AT FAN CONNECTOR WIRES.
check electric fans to see if they are coming on. and also make sure there is enough anti freeze in system. if fans do not work proper, check the fan relay if relay is ok. then the problem is either a bad wire or the fans itself are bad. to check fans-- take wire connector off of fans, then run a wire from positive on battery to positive on fan, ground other wire if need be. if fans do not run then thats your problem.
cooling fan will not come on until about 230 degrees, if fans still do not work. check the fuses and relay. if ok then run a wire to fan from battery.on fan side connection, run a wire from battery positive to fan connection. run a wire from negative to ground connection.if fan will not come on it is either bad or the coolant temp, sensor is bad. because this sensor send info to pcm from various running conditions. it is very important that this sensor works. it can cause;
The Fuse is No 37 in engine bay fusebox, for location see http://www.bluejag.co.uk however operation is quite complex , the fan control unit is located top left near the fans. The supply to the fans is a pulse width modulated signal from the control unit.
Check to see if there is water in the oil...If there is water in the oil then it could have a head gasket problem..Did you ever replace the thermostat? If it is stuck then it would also cause overheating...Excessive exhaust backpressure because of a clogged catalytic converter could also cause overheating..Also check belt tension and condition. A loose belt that slips may prevent the water pump from circulating coolant fast enough and/or the fan from turning fast for proper cooling...Another thing it could be is a faulty water pump -- Any wobble in the pump shaft or seepage would call for replacement. In some instances, a pump can cause an engine to overheat if the impeller vanes are badly eroded due to corrosion or if the impeller has come loose from the shaft. The wrong pump may also cause an engine to overheat. Some engines with serpentine drive belts require a special water pump that turns in the opposite direction of those used on the same engine with ordinary V-belts... Also check the Fan -- With mechanical fans, most overheating problems are caused by a faulty fan clutch, though a missing fan shroud can reduce the fan's cooling effectiveness by as much as 50% (depending on the fan's distance from the radiator) which may be enough to cause the engine to overheat in hot weather or when working hard.
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