1. Identifying the Problem:
* Blower Motor: Is the blower not working at all? Does it only work on high speed? These point to different potential problems (motor itself, resistor, or even wiring).
* Heat Control: Is the heat not working at all? Is it inconsistent? This could be related to the blend door actuator (controls hot/cold air mix), thermostat, coolant level, or even the heater core itself.
2. Replacing the Blower Motor:
This usually involves:
* Accessing the Blower Motor: This often requires removing parts of the dashboard or accessing it from under the dash. The exact procedure is highly vehicle-specific. Your repair manual will show you where to remove screws, panels, and potentially even the glove box.
* Disconnecting Electrical Connections: Carefully unplug the electrical connectors to the blower motor and resistor pack. Take pictures or make notes to ensure proper reassembly.
* Removing the Blower Motor: This might involve removing screws or fasteners holding the motor in place. It's usually located behind the glove box or under the dash.
* Installing the New Blower Motor: Reverse the removal process, ensuring all connections are secure.
3. Replacing the Blower Motor Resistor (if necessary):
The resistor pack controls the different blower speeds. A faulty resistor often leads to only high speed working.
* Location: The resistor pack is often located near the blower motor itself, sometimes integrated with it, sometimes separate. Your repair manual will show its exact location.
* Replacement: Disconnect the electrical connectors, remove the old resistor, and install the new one. Make sure the new one is compatible with your model year.
4. Addressing Heat Control Issues:
If the heat isn't working correctly, it's a more complex issue. Possible causes and solutions include:
* Blend Door Actuator: This small motor controls the hot/cold air mix. A faulty actuator needs replacement. Accessing it usually requires significant dashboard disassembly.
* Thermostat: A faulty thermostat prevents the engine from reaching the correct operating temperature. Replacing this is a more involved engine-related repair.
* Coolant Level: Low coolant will drastically affect heating performance. Check and refill the coolant if needed. Low coolant could indicate a leak – this needs addressing.
* Heater Core: A clogged or leaking heater core requires replacement – a major job involving dashboard removal and potentially even draining the coolant system.
Crucial Safety Precautions:
* Disconnect the battery's negative terminal before starting any electrical work to prevent shorts and accidental shocks.
* Use appropriate tools and avoid damaging any components.
* Consult a repair manual: This cannot be stressed enough. Improper procedures can lead to further damage or injury.
* If you are uncomfortable performing this repair yourself, take your vehicle to a qualified mechanic. Improper repairs can lead to more significant problems.
Remember, this is a generalized overview. A repair manual is absolutely essential for safely and successfully completing this repair. You can find these manuals online or at auto parts stores. They will provide the specific steps, diagrams, and torque specifications for your 1994 Dodge Intrepid.
