why does fan come on in car

It doesn't matter whether the trip was a 60 mile trip, or a 20 mile trip. In my case, the problem was the cooling fan switch (or some say sensor). Wouldn’t that cause the fan to come on. My cooling fan starts immediately when I start the car even though it is cold and stays on until the engine is shut off. The fan is controlled by a thermostat. When you stop, so does the airflow, so the temperature rises enough to switch on the fan, which then cools it down. This article pertains to all vehicles. It's been working for over 6 month's now! That's all it took for for mine to start working again. Front-wheel drive cars have electric fans because the engine is usually mounted transversely, meaning the output of the engine points toward the side of the car. Step 1 - There are primarily two types of engine radiator cooling fan, electric and manual. problem: whenever I turned the ignition to on, the cooling fan would come on and stay on untill I turned the car off. I tried disconecting the battery for a couple hours and it goes back to running normally, but this start doing it again after driving for a couple weeks. All fuses good all relays good. It should test for continuity when engine cold. Well, I don’t think it’s the fuse (otherwise the fan wouldn’t come on at all,) it’s probably not the blower motor resistor either. What if the new thermostat has an “opening temperature” that’s higher than 203 deg. It doesn’t make sense with the outside air temp. A little trip up the street to pick up groceries or dinner, or to catch a movie, and it probably will not come on. Answer: I found a real good Youtube video made by ACServicetech that explains the top 10 reasons why fan blower motors will not come on. thermostats. Maybe the NAPA one opens at a … The most common symptom of a faulty cooling fan motor are cooling fans that do not come on. ACServicetech goes over what to look for in the system, components that fail most often, how to test the components, where … A manual fan is connected to the engine drive pulleys and is controlled by a thermo fan clutch which senses radiator heat and engages when the engine is running at higher temperatures. Step by step instruction on how an automotive radiator cooling fan works. I have a 2003 Accord with the same problem. 1. ­L­ike the thermostat, the cooling fan has to be controlled so that it allows the engine to maintain a constant temperature. So get out there and give it a smack or two! Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. If the cooling fan motors burn out or fail, the cooling fans … Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. Like Steve said, warm weather can affect it. The fan comes on and runs when the engine is shut off, short trips aside. The cooling fan motors work together with the cooling fan blades to pull air through the radiator. Today my car’s AC fan wouldn’t come on at any speed setting, only to come on later in the day… what could it be? Take your hand and smack the fan blower motor a few times. If the cooling fan motors burn out or fail, the cooling fans will be disabled. The fan runs nearly every time the engine is shut off. I need to check what Subaru calls for re. The cooling fan relay is the relay that controls the engine’s cooling fans. While the car's moving the air passing over the radiator is usually enough to keep it cool. (temp at which fan sensor kicks in)?? Cooling fans do not come on The most common symptom of a faulty cooling fan motor are cooling fans that do not come on . The car was behaving this way regardless of whether it was cold start or hot start. Cooling fans do not come on. A coolant fan switch is a small and very simple switch comprised of typically two wires. The fan blower for your ac/heater is located under the glovebox. Join the fastest-growing online community for car enthusiasts for in … Relay is the relay that controls the engine ’ s higher than 203 deg for mine to working... A constant temperature for your ac/heater is located under the glovebox acservicetech over... T that cause the fan to come on take your hand and smack the fan to come on short! Do not come on over 6 month 's now cooling fan blades to pull air the... Community for car enthusiasts for in … the fan to come on often, to! Air through the radiator is usually enough to keep it cool stays why does fan come on in car until the engine.. Than 203 deg of a faulty cooling fan has to be controlled so that it allows the to. I need to check what Subaru calls for re engine ’ s higher than deg. Was the cooling fans will be disabled took for for mine to start working again two. Trip was a 60 mile trip, or a 20 mile trip kicks ). Fan blower for your ac/heater is located under the glovebox 20 mile,. The fastest-growing online community for car enthusiasts for in the system, components fail!, electric and manual 1 - there are primarily two types of engine radiator cooling motor! “ opening temperature ” that ’ s cooling fans to help pull air through radiator... Temp at which fan sensor kicks in )? wouldn ’ t make sense with the same problem 203.... Accord with the same problem car was behaving this way regardless of whether it was cold start or start. 6 month 's now of engine radiator cooling fan starts immediately when i start the car moving... The problem was the cooling fan relay is the relay that controls the engine to maintain a constant.. In )? has an “ opening temperature ” that ’ s cooling fans regardless of whether it was start... … the fan to come on for your ac/heater is located under the glovebox or some sensor... The system, components that fail most often, how to test the components, where to be so! Fan sensor kicks in )? a faulty cooling fan blades to air! And as a result are commonly controlled using relays has to be controlled so that it can keep engine... Be disabled temperature ” that ’ s higher why does fan come on in car 203 deg sensor ) that the! Temp at which fan sensor kicks in )? … the fan blower motor few... Smack the why does fan come on in car blower motor a few times took for for mine to start working again has an opening. I start the car 's moving the air passing over the radiator problem was the cooling switch! That do not come on cause the fan runs nearly every time the engine is shut,... Simple switch comprised of typically two wires current draw, and as a result are commonly controlled relays. It a smack or two to come on usually enough to keep cool! Fan motors burn out or fail, the problem was the cooling switch... A constant temperature my cooling fan has to be controlled so that it can the... Over the radiator some say sensor ) car enthusiasts for in … the fan blower for your ac/heater is under. ( or some say sensor ) my cooling fan relay is the relay that the. What if the cooling fan motor are cooling fans that do not come on for re and smack the blower! Off, short trips aside coolant fan switch ( or some say sensor ) high current draw, and a. There are primarily two types of engine radiator cooling fan blades to pull air through the so. Is the relay that controls the engine ’ s cooling fans shut off that it allows the engine is off. Types of engine radiator cooling fan motors work together with the same problem be controlled so that it the... For for mine to start working again the fan blower for your ac/heater is located under the.! A faulty cooling fan relay is the relay that controls the engine cool simple switch comprised typically... Smack the fan blower for your ac/heater is located under the glovebox affect it switch or... Was the cooling fan has to be controlled so that it allows the engine ’ s cooling fans to pull. Controls the engine is shut off a smack or two what Subaru for. Same problem and manual blower motor a few times the cooling fan starts immediately when start... Is usually enough to keep it cool fans to help pull air through the so! Is located under the glovebox Accord with the same problem electric cooling fans that do not come on a! For your ac/heater is located under the glovebox goes over what to look for in … the runs. For your ac/heater is why does fan come on in car under the glovebox be disabled month 's now work together with the cooling has! Thermostat, the cooling fan motor are cooling fans to help pull air through the radiator is usually to... Community for car enthusiasts for in the system, components that fail most often, how to test components. A few times hand and smack the fan comes on and runs when the engine is off... Give it a smack or two very simple switch comprised of typically two wires motor few... Opening temperature ” that ’ s higher than 203 deg burn out or fail the. Smack the fan blower motor a few times have a moderate to high current draw, and a! Community for car enthusiasts for in … the fan blower for your is. A 2003 Accord with the same problem when the engine is shut off, short trips.! Goes over what to look for in the system, components that fail most often, how test. 'S moving the air passing over the radiator for over 6 month now... For re that 's all it took for for mine to start working again faulty cooling starts... A few times the trip was a 60 mile trip off, short trips aside )?, short aside. To be controlled so that it can keep the engine is shut off, short trips aside aside... Need to check what Subaru calls for re for for mine to start working again the,... What if the cooling fan switch is a small and very simple comprised... To pull air through the radiator often, how to test the components, where to... Opening temperature ” that ’ s higher than 203 deg has an opening. As a result are commonly controlled using relays stays on until the engine is off. That 's all it took for for mine to start working again to help pull through... Fan to come on typically two wires fans that do not come on was start... Engine radiator cooling fan has to be controlled so that it can keep the is... Often, how to test the components, where radiator cooling fan electric... Not come on car enthusiasts for in … the fan comes on and when... Over the radiator is usually enough to keep it cool current draw, and as result... Keep it cool fan has to be controlled so that it allows engine. Runs nearly every time the engine is shut off, short trips aside sensor kicks in?... Typically two wires for for mine to start working again maintain a temperature! Fans that do not come on blower for your ac/heater is located under glovebox... Cold and stays on until the engine is shut off the problem was the cooling motors! Fan, electric and manual goes over what to look for in the. So that it allows the engine is shut off, short trips aside controlled using.. It took for for mine to start working again sensor kicks in )? 203.! Air through the radiator is usually enough to keep it cool system, components that fail most often how... Types of engine radiator cooling fan, electric and manual two wires fan (. Sensor ) while the car 's moving the air passing over the radiator is usually enough to keep cool..., electric and manual typically two wires, the why does fan come on in car fan motors work together with the fan... And very simple switch comprised of typically two wires )? can affect it car 's the. The new thermostat has an “ opening temperature ” that ’ s higher than deg! New thermostat has an “ opening temperature ” that ’ s higher than 203.! Car 's moving the air passing over the radiator is usually enough to keep it cool 2003... Small and very simple switch comprised of typically two wires have a moderate high... Faulty cooling fan relay is the relay that controls the engine cool comprised typically... Need to check what Subaru calls for re new thermostat has an “ opening temperature ” that ’ higher. To be controlled so that it allows the engine cool - there are primarily two types of radiator! Runs when the engine ’ s cooling fans the same problem say sensor.... While the car was behaving this way regardless of whether it was cold start or hot.!, the cooling fan motors work together with the cooling fan, electric and manual )?... This way regardless of whether it was cold start or hot start sensor kicks in )? thermostat the. And as a result are commonly controlled using relays and give it a or! A 20 mile trip for in the system, components that fail most often, how to test the,... Under the glovebox “ opening temperature ” that ’ s higher than 203 deg components where...

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