I have checked the 20 amp fuse, the relay, and the fan temperature switch. All check out good. What else might be causing the fan to not work?

Hi Our and welcome, could be the fan motor, I would unplug it and try to power it up direct to see if it will run. Hang tight for one of the experts. Good luck

How did you test the fuse, relay, and switch?

. Test all under hood and under dash fuses with a test light or multi-meter.

. Relay Test:

A - C
| |
B - D

There should be continuity between C and D terminals. There should be continuity between the A and B terminals, when power and ground are connected to the C and D terminals. There should be no continuity when power is disconnected.

. Fan Test: Using jump wires, or a Power Probe II, ensure the fan motor runs.

. Switch Test: With the switch on, test for continuity between terminals 12 and 11. With the switch off, there should be no continuity between terminals 12 and 11.