1998 chevy silverado 1500 heater fan wont come on.

you need to replace the fan resistor located by fan motor if not there then trace red and black power wires to locate resistor behind or under dash it wont be mounted far from fan motor

Heater fan (blower motor relay) is stuck in the run position. Take it out and replace.

Motor is working...?
If so. Need ground.


Mai Lor

Either swich for fan motor is shot or fan motor burned out.

you can test the motor with a multe tester with ohms capable, locate the heater motor and the wires feeding it there will be 2 find the plug and unplug it, using the tester probe the 2 wires with the red and black from the meter to the motor side, on ohms scale the meter should deflect close to full scale, with a digital it should read around 30 or have at least have a low number but no lower than 20 or so, if you get a reading your motor is probably OK, you can also use the meter in voltage mode and with the heater turned on you should read a voltage higher than 10 on the vehicular side of the plug, if there is no voltage there check to see if you have voltage at the heater fuse, if so than replace your fan control switch,,,good to go

blower resistor.. located under the pass. side of the heater case ..

remove the passenger side lower insulator panel. behind the panel you wil find the blower motor housing. next to the blower motor housing there will be a wiring connector with 6 to 8 wires going in to it. the connector will be held secure with 2 screws. remove the connector and remove the screws -- this is your resistor. reverse the process to re-install.

replace the motor it is burned up

look at your blower resistor it will be close to blowr motor. sounds like it got hot and melted connector.

when it doesnt come on next time, put it on high and give it a hit with your hand and see if it comes on. or test it for power at blower with test lite