Diyvehiclerepair
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.
- What causes cooling fans not to come on?
- What happens when your cooling fan relay is bad?
- Is there a fuse for the cooling fan?
- Can a bad thermostat cause radiator fan not to work?
- Why is my radiator fan fuse blowing?
- Where is the cooling fan relay located?
- What sensor controls the radiator fan?
- How do I know if my radiator fan motor is bad?
What causes cooling fans not to come on?
Six things may prevent an electric cooling fan from coming on: ... Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan) Faulty fan relay. A wiring problem (blown fuse, loose or corroded connector, shorts, opens, etc.)
What happens when your cooling fan relay is bad?
The cooling fans don't work
Rather than uncommonly high engine temps, the driver may notice that the cooling fans have stopped running. A faulty or broken relay cannot deliver power to the cooling fans. In turn, the unpowered fans won't run, leaving the radiator to its own devices.
Is there a fuse for the cooling fan?
The fan itself often uses a big fuse of around 50A, while there might also be a separate small fuse to the fan control module. Remember that if the fan fuse is blown – there might be a problem with the wirings or the radiator fan.
Can a bad thermostat cause radiator fan not to work?
Broken Thermostat
Thermostats are known to go bad and cause all sorts of cooling issues. ... 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.
Why is my radiator fan fuse blowing?
A blown cooling fan circuit fuse is another symptom of a potential problem with the cooling fan motors. If the motors fail or surge, they may cause the fuse to blow in order to protect the rest of the system from any sort of damage due to electrical surges.
Where is the cooling fan relay located?
The fan relay is usually located near the bottom of the engine compartment on a metal frame member. The metal acts as a heat sink to keep the fan relay cool. So, unplug the connector at the relay and repeat the check for power. If you get power, you've got a bum relay.
What sensor controls the radiator fan?
On most modern cars, the cooling fan is controlled by the Engine Control Unit (ECU) which gets a signal from the coolant temperature sensor.
How do I know if my radiator fan motor is bad?
The most common symptom that the radiator fan has gone bad is that it will stop working. Sometimes the motor burns up or fails. Other times, the relay stops working. Either way, you know there is an issue with the fan system if it is unable to run.
