I have a 95 integra rs. I am Trying to diagnose why my engine fan is not working. First I checked to see if the fan I had actually worked. I unplugged the fan and ran a ground wire to one side and put power wire to the other side of the fan plug and the fan cut on. So the faN works. Then I checked power to the fan by unplugging the ECT at the thermostat and jumping it with a paper clip. The fan cuts on. So does this mean my fan switch is bad? Is their another way to check it?

 

fan switch is bad or fuse is popped check the fuse in the fuse box located in the engine bay.

 

How do I check that fuse? It's a black denso fuse. I tried taking a light tester to it and I got nothing but so did I when I checked the ones next to it that are also black denso fuses.

 

It would not be due to a blown fuse if the fan ran after you jumped the ECT switch (fan switch). Issue can be either an air pocket in cooling system, faulty ECT switch (fan switch), or the coolant temperature at the ECT switch is not at the threshold to close (e.g., 200 degrees F).

The coolant temperature switch can be tested by removing the switch and suspend the switch in water and heating it. Above 200 degrees F, there should be continuity between the terminals; which means the contacts closed.

1. Is the car overheating?

2. Does your car have A/C? If so, both A/C condenser fan and radiator fan should run at the same time, if the ECT switch was jumped with the ignition on.

 

This is great information! I removed all my A/C down to the blower in the dash board and The car is not overheating. I'll bleed my coolant and let it heat up real good this time to see if my fans cuts on if not I'll switch out the ECT switch.