Heater motor does not work

When you say thermistor relay is that the blower fan relay near the blower motor? We are losing power somewhere.

Here are some guides and diagrams to help us run some simple tests so we can get the problem fixed:

https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester

and

https://www.2carpros.com/articles/how-to-check-a-car-fuse

and

https://www.2carpros.com/articles/how-to-check-an-electrical-relay-and-wiring-control-circuit

Please let us know what happens and upload pictures or videos of the problem.

Cheers, Ken