Heater motor

Usually the resistor goes out first. If you put your blower on high it bypasses the resistor and usually will work. But if it doesn't work at all then you need to check to see if the switch is bad, the resistor, or the blower. If you disconnect the bloser and touch the hot lead with a test light and it lights up then it's your blowr that's bad.

Yes the relay could be bad but like I said previously, put a testlight at the blower lead and if it gets poser or the light lights, then it's thebloweris bad. Make sure to check the fuses as well.