to dissipate the residual heat in the radiator it will shut off automatically
Cooling fans are controlled by the computer based on input from temperature sensor. After the vehicle is shut down, if the temperature is still high, the computer will turn on the fans to cool the engine.
Do they ever shut off? Some fans are designed to run a minute or so after the car is shut off to prevent boil over.
Check the temperature sensor and the relay (if applicable) No, it's not safe to run any vehicle without adequate cooling. BTW, many cooling fans will continue to run after the engine is shut down. If the cooling fan stops once the engine is cool, it's running properly.
Some cooling fans will stay running even if the car is shut off to cool down the motor. Once the fans thermostat gets tripped to shut off, the fan will continue to run.
Many engines have an automatic shut off when the engine becomes too hot. Once the engine cools down it may also be equipped with an automatic startup.
The engine temperature must reach 232-235 degrees in order for the cooling fans to come on. They will shut off at about 195-200 degrees. Also when the air conditioner is on the cooling fans automatically come on regardless of temperature.
On some makes of vehicle, the engine fan is supposed to keep running after the engine is shut off, if it was operating on a long trip on a hot day, for example. Come back to the car in 10-15 minutes. If the fan is still running, you have a problem. If it has shut off, all is well.
Yes, if there are two cooling fans one operates off of engine coolant temp. and the other operates off the A/C. The one that operates off of coolant temp will run for a while then shut off, then run again and continue to cycle. This is to keep engine at operating temperature. The other one runs when the A/C is on because when the compressor engages it puts a load on the engine, which will create heat beacuase the engine works harder. as long as both fans operate your okay.
When 1990 Honda is running cooling fan does not come on but comes on when engine is off and I thermostat and temperature switch changed?"
carries water from and to the engine to the radiator for cooling, there are 2 and contain hot water when the engine is running and will still be hot and pressurerised for an hour after the motor is shut off.
You are correct, they do turn on and off in alliance with engine temp
No Damage Should Result From This If You Allow The Car To Cool Down On Its Own, Although It Would Have Been Best To Let The Fan Run Until It Shut Off. But Sounds Like You Are OK.