Can a bad thermostat cause the fan to not turn on?
If the thermostat is stuck open (allowing coolant to flow) it can cause the engine to run cooler than normal so obviously the fan wouldn’t come on..but not like the engine/coolant can be running too hot and the thermostat somehow effects the sensor reading or operation of the fan.
Do fans turn on when thermostat opens?
The thermostat opens when the water temperature reaches the set temperature of the thermostat. It is purely mechanical, operating with a wax plug and a spring. A modern car’s electric fan is operated by the computer and turns on when the water temperature sensor reaches a high enough reading.
How do you know when thermostat opens?
As the engine heats up, the thermostat should open up and allow the coolant to flow from the radiator to the engine. If you see the coolant flowing through the radiator, then the thermostat opened and is working properly.
When does the thermo coolant fan switch shut off?
As engine temperature rises to a specific threshold, the switch is activated powering on the coolant fan. The coolant fan will continue to run until the engine temperature cools down to a specific predetermined level. Once the temperature reaches this cooling stage, the coolant fan will shut off.
What should temp be when cooling fan does not come on?
NOTE: if the cooling fan doesn’t come on when the engine has been operating for 20 minutes or more, make sure that coolant is reaching operating temperature, around 220°F (104°C). You may be dealing with a stuck-open thermostat.
Can a thermostat issue cause coolant to stop flowing?
So, thermostat issues, can cause coolant temperatures to change erratically. Consequently, thermostat issues, can prohibit engine coolant, from flowing normally. So, what thermostat issues, could cause your thermostat to stick open or closed ?
Why does the radiator fan not come on when the AC is on?
In order for the AC Condensor to do its job it must stay as cool as it can. As for the engine coolant temp sensor, if the coolant is not hot enough to make the fan come on, then there is no need for the fan yet and there is no problem.
NOTE: if the cooling fan doesn’t come on when the engine has been operating for 20 minutes or more, make sure that coolant is reaching operating temperature, around 220°F (104°C). You may be dealing with a stuck-open thermostat.
What does it mean when your radiator fan is not working?
This is what we call a blown fuse. A blown fuse is no big deal, and changing one does not cost a lot of money. If your car’s radiator fan is non-functional, check your car’s user manual and locate the fuse for the radiator fan controller or the fan.
What causes a car cooling fan to run continuously?
2. A cooling fan temperature switch (or sensor, in some vehicles) can also get stuck, which may cause the fan to run continuously any time you turn the ignition key on or start the engine. Troubleshoot the switch. 3.
How are radiator fans used in late model cars?
Many late-model cars and trucks use electric radiator fans. To cycle the fans on and off, the computer relies on signals from the engine coolant temperature sensor mounted at the top of the engine. When the computer registers that the coolant temperature sensor reading has risen above a certain point, it turns on the radiator fans.