Owners manual lists the fuses as :
Engine compartment fuse # 105, 40A
- This is the power to the blower motor relay to drive the blower.
Cab Fuse Panel, Fuse #22, 10A. This is the power to the switch in the HVAC panel.
- This fuse through the switch to operate the relay coil on the blower motor relay.
The other thing to check is the blower motor resistor, to see if there is any damage to it ( usually this is the blower only works on high )
This is behind the glove box
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