What tells cooling fan to turn on?
The engine temperature should trigger the fan to turn on. It will also turn the fan off once the engine has cooled to under 200 degrees. You may have heard of a part called the radiator fan switch or temperature fan switch. This is linked to a thermostat and works much like your home’s HVAC system.
When should cooling fan turn on?
To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. Most fans should come on when the coolant reaches about 200 to 230 degrees.
What causes a fan to not turn on?
If your cord is plugged in but nothing happens when you turn on your fan, check to see that you have electricity running to the outlet. To do this, open your breaker panel and look to see if the circuit breaker has been tripped.
Does the cooling fan turn on with AC?
The condenser fan (if it has a dedicated fan) or the radiator fan most always comes in (with AC on) when the compressor discharge pressure (or, alternatively, the liquid line one; look for where a sensor or a switch is located on the high pressure line) rises over an operative threshold.
How do I know if my cooling fan switch is bad?
The best way to tell if your cooling switch is faulty is to listen to your engine while you drive. You know how your engine is supposed to sound, and if you notice that you don’t hear the fan as often as you normally do during your afternoon commute, you might have a failing switch.
Should both radiator fans turn on?
Both fans should come on when the A/C is on. If one or both fans fail to come on, the lack of additional cooling provided by the fan may cause poor A/C cooling performance, and it may cause the A/C compressor to overheat and fail. The engine may also run hot and overheat, too.
Does the thermostat control the radiator fan?
The thermostat opens and closes when there is a need to. How it works is simple. When the temperatures outside are cold the thermostat stays closed and the coolant stays in the engine. When the coolant reaches the working temperature the thermostat opens and the coolant circulates through the cooling system.
Does temperature sensor turn on fan?
As the control system receives the temperature from the CTS, it may trigger the cooling fan to either shut off or turn on. Additionally, it may signal the need for a richer fuel mixture or open the exhaust gas recirculation.
What controls the condenser cooling fan?
The condenser fan relay is the electronic relay that controls the power to the AC condenser cooling fan. When the relay is activated the AC condenser fan is switched on so that it can keep the AC condenser cool.
Can a bad thermostat cause my radiator fan not to work?
If this thermostat doesn’t open when the engine reaches the working temperature, the coolant will stay inside the engine block and the engine will start to overheat. This will result in the radiator fan not working.
What turns on AC condenser fan in a car?
Temperature Activation: Some electric fans are activated by an engine coolant temperature (ECT) sensor or switch, though not the same ECT the engine control module (ECM) uses for other calculations, like fuel injector pulse width. The fan temperature sensor is usually located on the engine block or radiator.
What turns on the AC condenser fan?
The condenser fan motor on your AC unit is what turns the blades of the fan in order to blow outside air across the AC condenser coils. This process converts hot refrigerant gas into a cool liquid, ultimately providing cool air for your home.
What causes the radiator fan to come on?
Engines operate at their most efficient when they’re hot but not too hot. The fan turns on when you’ve stopped driving because no more cooling air is flowing into the engine bay. This causes the temperature to rise, automatically triggering the fan.
Why are my radiator fans not kicking on?
The most common reasons a radiator fan is not working are luckily due to a blown fuse, bad relay, or a broken wire. It can also be caused by a faulty coolant temp sensor, low coolant level or the fan itself can be damaged.