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first check the heater fuse...then you want to unplug the fan motor lead and run it straight to the battery...if it works then you will need to check the resistor assembly..it is located on the heater housing right near the fan..it controls the different speeds for the fan and usually has 4-6 wires coming off it. If these don't fix the problem...try looking in the fuse/relay box both in the cab and under hood to see if you have a relay for the heater fan...as it may be defective
Quite possible that the fan has quit due to the lower temperature as the thermistor is set Up. Now this can be confirmed once the car is warming up to go beyond the set engine temperature.
So unless this is confirmed all that you need to do is to check if there is a fuse link break to the fan motors.
The resistors are in circuit only on the lower fan speed settings.
On the highest speed setting, power is switched directly to the fan motor.
Check fan power supply fuses,
Check power is available to the fan when high speed selected.
If all above OK, apply power directly to the motor to verify fan motor runs- if it doesn't the motor may need replacement/repair.
Disconnect the wire from the fan, turn the car on, test the voltage between the connector to ground (chasis) on all fan speed settings (high,med,low). If you have voltage at all settings (approx. 12.3V on high and less as the speed setting is lower) then replace the fan motor (about $50 at autozone). If there is not voltage on all speed settings you will also need to replace the blower motor resistor (about $12 at autozone). The whole process takes about 20 mins.
Well, the blower resistor handles the lower speeds and the hi-blower relay handles the hi speed only. if the fan still works on the lower speeds then the resistor is bad. if the fan doesn't work at all then your motor has failed and or burn't the relay out also. if you can get your blower to start by hitting the kick panel above the pass. side foot area then the motor is bad. if you are handy enough to drop the kick panel and access the motor then check the connections at the motor. Then wack the motor and see if it comes on then. you will most likely find the problem if you follow those simple rules above. Good luck.