Re: heater switch to operate the fan inside the car
It's usually caused by a faulty fan speed control resistor. If you can follow the wires from your switch, they usually connect to this resistor and in turn the resistor is connected to the fan. I found my fan control resistor on my GM car inside the fan cavity. I removed the fan and located it inside the housing. This resistor gets very hot so it is placed close to the fan to cool it. Good luck.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
the cab heater fan?, there can be 4 fans on some cars. front condenser, 2 on rad, and 1 in cab heater box. the cab fan? does it fail on high too? it has a switch, (marked fan speed) the switch is bad ,if low speed are dead. and high are good. or wiring to it , the motor or the fuse. even a cracked fuse, change the fan fuse to a new fuse.
Try your blower on all speeds. Sometimes the high speed will work and that would mean you have a bad resistor for the fan motor.
If it doesn't work on any speed you could have;
1. A blown fuse.
2. A bad fan switch.
3. A bad connection/short somewhere between the switch and the fan motor.
4. A bad fan motor.
You may want to try your fan on all speeds. If it will work on high, you have a bad resistor for the fan motor. ( high speed doesn't go through the resistor ).
If it doesn't work on any speed, I would check the following;
1. Make sure the fuse isn't blown for the fan blower motor.
2. Check, or have checked the wires between the fan control switch and the fan blower motor.
3. Have the fan control switch checked.
4. Have the fan blower motor checked.
Check the heater control switch,,,,,and the number of wires at the heater motor....Some motors have more than one winding...in which case there will be three or more wires going into motor..there can be burnout in those windings and will require a new motor....check the plug which attaches to the motor....can be bad connection...or at the switch.....but if there is only two wires....then the heater switch uses resistors to slow down the different speeds...and direct connection for high speed....and the problem is definitely the switch...
check the fuses than check for power and ground at the blower motor plug with the engine running and the switch on high. if you have power and ground replace the blower motor. somtimes the blower motor resistor fails too but than the blower usually only works on high. I replaced 1 of each this week.