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Re: heater fan not working in 05 Chevy Equinox
I suspect you also checked the fuses, some vehicles are double protected, especially since you usually have to remove the entire dash panel to get to the heater fan blower motor. It should be in the middle or under the glove box, should be located in a plastic box that has like a bell shape to where the motor is. check fuses then check wiring, and make absolutely certain the relay was the correct one that you changed, in a 3 year old vehicle the fan motor should not be bad yet.
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This may be the same problem already posted. If the fan doesn't work, a LIKELY problem is the thermal fuse on the fan speed resistor has opened. You can either replace the whole resistor which is in the air plenum to be cooled by airflow, or you can replace the thermal safety fuse on the resistor that is a two lead device suspended on two protrusions above the resistor. Search Gooogle for 2003 chevy avalance heater resistor for photos of the device.
Hello: You may have a cooling fan(s) problem. Start the truck, turn the a/c on max, both fan and a/c control. Open hood the cooling fan(s) should be running. If not then you will need hands on trouble shooting. It could be fan(s) motor(s), relays, relay control, ie PCM, wiring, fuse etc. Systematic hands 0n trouble shooting will be needed with a upscale scan tool.
There is a sensor that the fan is connected to that is plugged into the engine block that senses the temperature. Maybe the wire is broken. Trace all the wires from the fan to wherever they are connected and find the one that is not attached or cracked or shorting. That sensor may also be bad.
most headlight switches are pop in style that u just pop out of the dash and gently undo the electrical connector and replace it in reverse order, however all GM cars have individual relays for the lights so You may want to try a new relay first.