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