1. Identify the Specific Problem:
* No air from any vents: This suggests a more significant problem, possibly with the blower motor, blower motor resistor, or even a fuse. Address these before focusing on the blend doors.
* Air only comes from one position: The blend door (or doors) might be stuck in that position.
* Intermittent operation: The blend door actuator (the motor that moves the door) might be failing. This is common.
* Unusual noises: Clicking, grinding, or whining noises during blend door operation point to a problem with the actuator or the door itself.
2. Basic Checks:
* Check fuses: Consult your owner's manual to identify the fuses related to the HVAC system.
* Check the blower motor: Ensure it's working. If it's not, the blend doors are irrelevant until this is fixed. You'll hear the blower motor running if it's working.
* Test the HVAC controls: Cycle through all the settings (defrost, dash, floor, etc.) to see if any movement occurs.
3. Advanced Troubleshooting:
* Listen for the actuators: When you change the airflow direction, you *should* hear a faint whirring or clicking sound as the actuator motors move the blend doors. Lack of sound in a specific direction suggests a faulty actuator.
* Visual Inspection (Difficult): Accessing the blend doors in a 1995 Lincoln Town Car is notoriously difficult. It often requires partial dashboard disassembly. If you're comfortable doing this, you can look for:
* Broken blend doors: Look for any physical damage to the doors themselves.
* Stuck blend doors: Manually try to move the doors (with extreme caution) to see if they're stuck from debris or vacuum leaks.
* Broken or disconnected linkages: The actuators often connect to the blend doors via linkages; inspect these for damage.
* Actuator Testing: With the dashboard partially disassembled (if you're comfortable with this level of repair), you can often test the actuators directly using a 12V power source (with caution!) to see if they still move. This requires knowing which wires go to which actuator.
* Vacuum System (Less Likely): Older cars sometimes use vacuum to control blend doors. Check for vacuum leaks in the lines if you suspect this system is in use. A vacuum gauge might be helpful here.
4. Repair Options:
* Actuator Replacement: This is the most common repair. They're relatively inexpensive and readily available online.
* Blend Door Replacement: Replacing a broken blend door is significantly more involved, often requiring complete dashboard removal.
* Professional Help: If you're not comfortable disassembling your dashboard, it's best to take it to a qualified auto mechanic. The labor cost for this repair can be significant due to the complexity of access.
Important Notes:
* Safety First: Disconnecting the battery before working on the electrical system is crucial.
* Consult a Repair Manual: A service manual specific to your 1995 Lincoln Town Car will provide detailed diagrams and instructions, significantly aiding in troubleshooting and repair. These can be found online or at auto parts stores.
* Take Pictures: Before disassembling anything, take plenty of pictures to help you remember how everything goes back together.
The blend door problem is complex in these cars. Start with the simple checks and only proceed to more involved steps if necessary. If you're not mechanically inclined, consider professional help to avoid further damage.
