The heater fan worked on high for awhile then all of the sudden it stopped on 2002 Chevrolet Astro

If you hook it up manually it will work but it will not work when ou put it all back together

3 answers 1 comment
your fan blower motor resistor failed
ck your fan resister and or the wiring pigtail,they are known to short out
I agree with #1 and #2
The most common failure for this type of complaint is the fan speed control rheostat/resistor. Check or replace this part and make sure you take a close look at the connector from the wiring harness to the rheostat as these will sometimes corrode or melt from the excess heat at the connectors themselves. Replacement fan rheostats and pigtails can be purchased from your local parts supply house.