If your radiator fan isn't working, the problem is more likely to be:
* The fan motor itself: It could be faulty.
* The fan relay: This is a small switch that sends power to the fan motor. The relay's location may vary slightly depending on your exact Catera model, but it's usually found in the underhood fuse box or nearby. Check your owner's manual for its precise location.
* The engine coolant temperature sensor: This sensor tells the ECM when to turn the fan on. A faulty sensor would prevent the fan from activating.
* A wiring issue: A break or short in the wiring between the ECM, relay, and fan motor could be the cause.
* The ECM itself: While less likely, a faulty ECM could also be responsible.
To diagnose the problem, you'll need to test the fan motor, the relay, and the coolant temperature sensor with a multimeter. A mechanic can do this quickly and efficiently. Simply checking fuses won't solve the problem if the fan's issue isn't fuse-related.
