1. Preparation:
* Disconnect the battery: This is crucial to prevent accidental shorts and electrical shocks.
* Gather tools: You'll likely need a variety of sockets, wrenches (both metric and standard), screwdrivers (Phillips and flathead), pliers, possibly a socket extension, and possibly a pry bar. A shop rag or two will also be helpful.
* Consult your repair manual: Locate the diagrams and steps specific to your heater motor replacement. This will give you the best chance of success and avoid damaging other components.
2. Accessing the Heater Motor:
* Most likely, you'll need to access the heater motor from inside the vehicle: This typically involves removing the glove box and potentially parts of the dashboard. The exact procedure varies dramatically depending on your LeMans' specifics. Your repair manual will be your guide here. Expect some disassembly to get to the blower motor housing.
* Sometimes, there's limited access through the engine compartment: This is less common, but check your repair manual for this possibility.
3. Removing the Old Heater Motor:
* Disconnect electrical connectors: Carefully unplug the electrical connector(s) leading to the heater motor. Take pictures or make notes to remember how they connect for reassembly.
* Disconnect any ductwork: Detach the air ducts leading to and from the heater motor. This often involves removing clamps or screws.
* Remove mounting screws or bolts: The heater motor is typically secured to the blower housing with screws or bolts. Remove these carefully.
* Remove the heater motor: Once all fasteners are removed, the motor should be able to be pulled out. Sometimes it's a tight fit. Use gentle persuasion; avoid forcing it.
4. Installing the New Heater Motor:
* Install in reverse order: Follow the steps you took to remove the old motor, but in reverse order.
* Reconnect the electrical connector(s): Ensure the connectors are securely plugged in.
* Reconnect the ductwork: Make sure all air ducts are properly attached.
* Secure the new motor: Tighten all mounting screws or bolts securely.
5. Testing and Reassembly:
* Reconnect the battery: Once everything is reassembled, reconnect the battery.
* Test the heater: Turn on the ignition and test the heater fan on all speeds. Listen for unusual noises (grinding, rubbing). Check for proper airflow.
* Reassemble the dashboard and glove box: Carefully put everything back in place.
Important Considerations:
* Replacement Motor: Ensure you're purchasing a heater motor that's specifically compatible with your 1970 Pontiac LeMans.
* Take Pictures: As you disassemble, take plenty of pictures to help with reassembly.
* Patience: This is a potentially time-consuming task. Be patient and methodical.
* Safety First: Always prioritize safety. If you're not comfortable working on your car, consult a professional mechanic.
This is a general guide. Referencing a repair manual specific to your 1970 Pontiac LeMans is absolutely essential for completing this job successfully. Attempting this without a proper manual can lead to damage to your vehicle.
