A little trip up the street to pick up groceries or dinner, or to catch a movie, and it probably will not come on. Join the fastest-growing online community for car enthusiasts for in … If the cooling fan motors burn out or fail, the cooling fans … I have a 2003 Accord with the same problem. If the cooling fan motors burn out or fail, the cooling fans will be disabled. Wouldn’t that cause the fan to come on. Maybe the NAPA one opens at a … problem: whenever I turned the ignition to on, the cooling fan would come on and stay on untill I turned the car off. 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. It doesn't matter whether the trip was a 60 mile trip, or a 20 mile trip. So get out there and give it a smack or two! It should test for continuity when engine cold. The fan blower for your ac/heater is located under the glovebox. That's all it took for for mine to start working again. 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. 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? 1. My cooling fan starts immediately when I start the car even though it is cold and stays on until the engine is shut off. Most cooling fans use electric motors that have a moderate to high current draw, and as a result are commonly controlled using relays. The fan comes on and runs when the engine is shut off, short trips aside. A coolant fan switch is a small and very simple switch comprised of typically two wires. ­L­ike the thermostat, the cooling fan has to be controlled so that it allows the engine to maintain a constant temperature. It doesn’t make sense with the outside air temp. Most modern vehicles use electric cooling fans to help pull air through the radiator so that it can keep the engine cool. Cooling fans do not come on. The most common symptom of a faulty cooling fan motor are cooling fans that do not come on. thermostats. Take your hand and smack the fan blower motor a few times. 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. The car was behaving this way regardless of whether it was cold start or hot start. This article pertains to all vehicles. What if the new thermostat has an “opening temperature” that’s higher than 203 deg. Cooling fans do not come on The most common symptom of a faulty cooling fan motor are cooling fans that do not come on . While the car's moving the air passing over the radiator is usually enough to keep it cool. Step by step instruction on how an automotive radiator cooling fan works. In my case, the problem was the cooling fan switch (or some say sensor). Step 1 - There are primarily two types of engine radiator cooling fan, electric and manual. ACServicetech goes over what to look for in the system, components that fail most often, how to test the components, where … It's been working for over 6 month's now! The cooling fan motors work together with the cooling fan blades to pull air through the radiator. (temp at which fan sensor kicks in)?? Like Steve said, warm weather can affect it. When you stop, so does the airflow, so the temperature rises enough to switch on the fan, which then cools it down. The fan is controlled by a thermostat. The cooling fan relay is the relay that controls the engine’s cooling fans. The fan runs nearly every time the engine is shut off. I need to check what Subaru calls for re. All fuses good all relays good. 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