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Blown fuse? Bad blower motor? Bad blower motor resistor? Bad blower motor switch?
A bad heater blower motor resistor would effect one or more blower speeds other than high.
If the heater fan works on all speeds, then the blower motor, blower fuse, blower relay, and blower motor resistor pack are all good. If the fan runs but nothing comes out of the vents, you have a 'mode door' issue (which might include a bad control head).
The blower resistor gets overheated and burns out usually because the blower motor is failing also.
The blower may simply have burned out. If the blower is out then the heater probably still works.
Defective blower motor or blower motor resistor pack.
Defective Blower Motor Resistor Pack.
I would check any fuses/relays related to the heater or blower motor. If the heater fan doesn't work, could be a bad heater blower motor resistor(if has one) which are usually inline in the ductwork or out next to the heater blower motor under the hood. If the fan does work w/no heat then could possibly be a bad thermostat(stuck open) or control head.
The only relay in the heater system would be for the high speed function of the blower motor. That rely would be located under the hood, on the firewall, close to the blower motor resistor.
Something called a blower control module takes the place and is found in the hole where you would find a blower resistor, so there isn't a blower resistor in that vehicle. As far as the blower control module is concerned, the module is serviced as a unit. No part can be fixed or replaced. This is not to be confused with the control head in the dash. The blower control module is held into the heater box with two 8mm screws outside the firewall under the hood, where you would normally find the blower resistor pack.
Blown fuse, defective blower motor resistor pack, defective blower motor, a bad switch, or disconnected or loose wiring.
Could be, a blown fuse, a bad blower motor, a burned out blower motor speed resistor, a bad blower motor switch,