What controls radiator fan speed?
On older applications, fan operation is usually controlled by a temperature switch located in the radiator or on the engine. Input from the engine coolant sensor, ambient air temperature, vehicle speed sensor and other sensors may be used by the PCM to determine when the fan needs to be energized.
How do you test a radiator fan relay?
The quickest way to tell whether or not the electric fan(s) are working is to start the engine; let it reach normal operating temperature and then turn the A/C on. The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser.
Is Cooling fan Same as radiator fan?
The cooling fans are mounted on the radiator and work to pull air through the radiator fans to keep the engine cool, especially during idle and low speeds, where air flow through the radiator is significantly less than at road speeds.
Is radiator fan and AC Fan same?
The radiator fan is on a thermal control and turns on when the temperature reaches a set point, it has nothing to do with the AC at all. If your car is at running temperature and the AC fan is not coming on (assuming it is not -20 degrees outside) then there are likely one of a few causes.
Does cooling fan affect AC?
Likewise, does radiator fan affect AC? Yes, a broken radiator fan can cause the air conditiong to stop working. The AC system depends upon being able to dissipate heat into the engine coolant. You really need to have the fan replaced, or at least, have a diagnostic check to see what is causing the fan to stop working.
When should AC fan turn on?
Keeping your fan on AUTO is the most energy-efficient option. The fan only runs when the system is on and not continuously. There is better dehumidification in your home during the summer months. When your fan is set to AUTO, moisture from cold cooling coils can drip and be drained outside.
Why does my car overheat when AC is off?
You have a cooling problem which could range from a pressure leak(most likely) to bad water pump to clogged radiator to stuck thermostat. It cools off with the A/C because the fan is forced on.