Location

• On a Chevy pickup, the heater fan is located along the firewall inside the passenger side fender. Stand in front of the vehicle and look at the air-conditioning condenser mounted on the engine. Follow the hoses that lead back toward the air-conditioning coil. The hoses will connect to a large fiberglass box bolted to the firewall---this is the heater case. If your vehicle was not originally equipped with air conditioning, follow the heater hoses back to the fiberglass box. The heater fan will be mounted on the left side of the heater case (your left not the vehicle's) just behind the fender well.
  
  

Removal

• Begin by disconnecting the ground cable from the negative battery terminal. Loosen the bolt on the clamp and pull the ground cable off the negative battery terminal. Locate the heater fan and disconnect the positive and negative electrical leads. Take notice of which terminal on the electrical motor the black wire is connected to. Black wiring in automotive applications represent negative or ground. The wires must be installed on the new motor in the same position as they were on the old. They will be attached with plastic connectors that can simply be pulled off the contacts. The heater fan is bolted to the heater case with three or four hex head screws. Remove these screws and pull the electric motor straight out. With the motor removed, you will be able to see the plastic fan blades mounted on the back side of the motor. Remove the retaining nut that connects the fan blades to the electric motor and pull the blades off.
  
  

Installation

• Installation is the reverse of removal. Begin by reattaching the fan blade to the electric motor and reinstalling the retaining nut. Then slide the heater fan assembly back into position in the heater case. Reinstall the three to four hex head screws that secure the case. Then reconnect the positive and negative electrical leads, making sure to connect the black wire to the negative terminal. Finally, reconnect the ground cable to the negative battery terminal.