What does a radiator cooling fan do?
Basically, a radiator fan blows cooler air through the radiator to lower the coolant temperature and cool off the heat from the car engine. Obviously, when the engine is running, it produces heat. That heat must be dispersed so that the engine will not experience any form of overheating or become too hot.
Why is my radiator fan not working on my Honda Civic?
Figure 1. 1999 Civic under-hood fuse box with location of fan relay (circled in red). Another easy way you can check if the radiator fan switch relay is bad is to swap the radiator fan relay with the condenser fan relay. If the radiator fan begins working, this is an indication that the fan relay is bad.
What does the thermo switch on a Honda radiator do?
If the fan switch relay is giving off the appropriate readings and is in working condition, move on to the next step. The thermo switch (also called the cooling fan switch) sends a signal to the cooling fan, so the fan turns on if the coolant gets too hot.
How can I make my Honda radiator fan work?
Place one end of a fused jumper wire on one of the relay’s control terminals. Place the other end of the fused jumper wire on the car’s positive (red) terminal of the battery. Then, touch one end of a regular jumper wire to the other relay’s control terminal. Ground the other end of the regular jumper wire to the vehicle.
How can I tell if my radiator fan is working?
Here is how to test if the fan is functioning properly: Unplug the radiator fan connector. Run jumper wires between the connector’s two electrical terminals. See Contact Test in Step 1. If the fan does not turn on, you will need to replace it. Figure 3. Radiator fan testing points.
Figure 1. 1999 Civic under-hood fuse box with location of fan relay (circled in red). Another easy way you can check if the radiator fan switch relay is bad is to swap the radiator fan relay with the condenser fan relay. If the radiator fan begins working, this is an indication that the fan relay is bad.
If the fan switch relay is giving off the appropriate readings and is in working condition, move on to the next step. The thermo switch (also called the cooling fan switch) sends a signal to the cooling fan, so the fan turns on if the coolant gets too hot.
Place one end of a fused jumper wire on one of the relay’s control terminals. Place the other end of the fused jumper wire on the car’s positive (red) terminal of the battery. Then, touch one end of a regular jumper wire to the other relay’s control terminal. Ground the other end of the regular jumper wire to the vehicle.
Here is how to test if the fan is functioning properly: Unplug the radiator fan connector. Run jumper wires between the connector’s two electrical terminals. See Contact Test in Step 1. If the fan does not turn on, you will need to replace it. Figure 3. Radiator fan testing points.