Why does my AC fan keep running when the thermostat is off?
Why does my AC fan keep running when the thermostat is off?
Usually when the relay switch is broken, the fan will continue to run by itself. This happens because there’s no communication between the thermostat and the blower fan. Now, if it’s a short circuit, both the ‘on’ and ‘off’ commands you enter typically won’t get sent to the blower fan.
Why does my car fan keep running after I Turn Off the engine?
Running cooling fans help cool down the engine even after you turn off the car. Common Causes. If your cooling fan runs for over 10 minutes after turning off the engine, you may have a problem that needs to be fixed. Here are some possibilities causing the fan to stay running longer. low coolant level, faulty coolant temperature sensor,
What to do if your cooling fan won’t turn on?
Pull the cooling fan relay out of the box. Replace the cooling fan relay with a new one. A stuck closed relay is the only thing that can operate the cooling fan continuously with the key off. The computer looses power with the key off and the same applies to the coolant temperature sensor.
When does a computer fan turn on and off?
The computer turns the cooling fan on and off when it receives a temperature indication from the coolant temperature sensor. When the temperature exceeds a specific value — usually 215 degrees Fahrenheit — the computer will turn the fan on.
Why is my AC fan not turning off?
The most common reason that your Air Conditioner fan won’t turn off is because a stuck relay keeping the circuit closed. If it’s not the relay, your thermostat likely has a shorted cable or needs to be replaced.
How do you turn off an AC Fan in a car?
The way I have to turn it completely off,is first turn the a/c switch off, then wait about 1 to 2 minutes, start the car again, let it run a few seconds, then turn it off. The last time it happened it took me 3 trys, but make sure you look at the battery gage on the dash.
What causes a cooling fan relay to stop working?
Cooling fan relays can stop working for any number of reasons. Common causes for relays going bad include: There are several ways to tell if a bad cooling fan relay is to blame for an overheated engine. The easiest method is to start the engine and then turn on the air conditioning.
The computer turns the cooling fan on and off when it receives a temperature indication from the coolant temperature sensor. When the temperature exceeds a specific value — usually 215 degrees Fahrenheit — the computer will turn the fan on.
