Radiator fans comes on, but car dont start. On a cold engine.
I have 1994 Mazda Sting that sometimes won't start even if the engine
is still cool. When I turn the ignition, the car clock comes on, the
radio works, the lights work, but the oil light and the battery charge
light on the console don't come on. Also the radiator fan comes on, and
then the car don't start. This happens even with the first start of the
day, when the engine is still cool. The crank turns when i turn the
ignition, but the car don't take. This happens on and off. Not everyday
day. Any ideas? I checked all the fuses, the baterry terminals.
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the cooling fan is designed to come on when the setting is in defrost or A/C mode . the a/c compressor is set up to come on in the winter to help keep the seals flexible by running and cooling fans run to help provide air across the condenser and radiator to cool engine water and makes a/c cold in summer time use . cooling fan will cycle as it reads data from related sensors. this is a normal condition with your car
coolant temp sensor tells the computer how hot or cold the engine is so it can regulate the idle and fuel mixture, when it fails there usually is no cooling fan and you will have trouble starting the engine and keeping it running.
Sounds like the sensor is not reading the coolant temp, or the computer is not accepting the data from the sensor. Its possible you have air in the cooling system, or you have a problem with the computer.
This sounds normal. The coolant and any trapped air bubbles in the system will expand as the engine warms up, and cause this to happen. You ought to be very very careful about opening the radiator cap on a hot, or even warm, engine, as you can get a face-full of scalding hot coolant. The normal place to add coolant if needed is to the radiator overflow tank, normally a plastic tank off to one side, connected to the radiator neck by a smaller hose. This will have 2 levels marked on it, Hot and Cold. The radiator cap is not routinely removed, and on some cars is even locked on by an additional clip.
CAR OVERHEATING FIRST CHECK FOR LOW COOLANT IN THE RADIATOR COOLANT OVERFLOW JUG.IF COOLANT LEVEL IN OVERFLOW JUG LOW REFILL ADD COOLANT BACK TO THE FULL COLD MARK.PUT RADAITOR CAP ON COOLANT OVERFLOW JUG START ENGINE LET IT IDLE UNTIL IT OPERATING TEMPERATURE.MAKE SURE TOP RADIATOR HOSE GETTING HOT WHILE ENGINE WARM UP.IF TOP RADIATOR HOSE DONT GET HOT WHILE ENGINE IDLING YOUR THERMOSTAT COULD BE STUCK CLOSE CAUSING CAR TO OVERHEAT.IF TOP HOSE IS GETTING HOT.CHECK FOR COOLANT LEAKS CHECK TOP RADIATOR HOSE AND BOTTOM RADIATOR HOSE FOR LEAKS.CHECK FOR LEAKS AT THE RADIATOR CORES AND PLASTIC SIDE CONTAINERS.IF ALL IS GOOD ENGINE OVERHEATING WHILE IN A LONG TRAFFIC LINE, COOLANT FANS NOT COMING ON.COULD HAVE FAULTY ENGINE COOLANT TEMPERATURE SENSOR OR BLOWN COOLING FAN FUSE OR RELAY.COULD HAVE PCM FAULT.MAKE COOLING FAN ELECTRICAL CONNECTORS AND WIRING NOT DAMAGE OR BROKEN.
Check the radiator and the cooling fan. open the hood as the engine temperature rises does the fan come on. if not that the problem, Also do this As the car is warming up(from a cold start) near operating temperature, turn off the car, watch out for the fan, engine of key in your pocket fell the radiator is there any hot or cold spot? if there is the radiator is plugged. Also if the radiator isnt plugged new doesnt mean it works, the water pump itself can be faulty. and dont forget the most important device the Thermostat you did timing belt waterpump they should of done thermostat.
You need to fix the cooling fan immediately. You can start to check the paower input to fan first. If there is power input, now check fan for malfunction. For the newer car model, its fan equipped with temperature sensor. Just go check the sensor for malfunction also. Replace the defective parts to prevent this condition. The car with NO cooling fan can lead to worse condition even it can break your engine block.
when the car is cold, fill the radiator, start the car. Leave it running with the radiator cap off until the thermostat opens. If it opens the fluid in the radiator will be circulated by the water pump and the electric fan will turn on and cool the radiator. If not, the engine will overheat because either the thermostat is not opening or if the fan doesn't come on, the fan sensor is probably at fault, or both. If there is a noise and fluid leak, the problem could be the water pump. If there is no fluid leak, the problem is likely the thermostat or the fan sensor.