1. Check the Blower Motor Resistor:
* Location: The resistor is typically located behind the glove box or under the dashboard. Consult your repair manual for the precise location in your Eldorado.
* Function: This resistor regulates the fan speed. A faulty resistor can cause the blower motor to run at full speed all the time, even with the fan switch off.
* Testing: Visually inspect the resistor for any obvious signs of burning, melting, or loose connections. If possible, carefully remove it and check its continuity with a multimeter. A burnt-out resistor will show infinite resistance (open circuit). Replace it if necessary.
2. Inspect the Blower Motor Control Module (often part of the HVAC control head):
* Location: This is usually integrated into the HVAC control panel itself. Again, refer to your repair manual.
* Function: This module controls the power to the blower motor based on the fan speed setting. A faulty module can cause the motor to run continuously.
* Testing: Testing the module is more complex and often requires specialized tools or knowledge of automotive electronics. If you're not comfortable with this, it's best to have a professional diagnose it. Replacement is usually the solution if faulty.
3. Check Wiring and Connections:
* Inspect Wiring Harness: Look for any frayed, melted, or damaged wiring leading to the blower motor, resistor, and control module. Pay close attention to connectors – ensure they're securely plugged in.
* Ground Connection: A poor ground connection can also cause this issue. Trace the ground wire from the blower motor and ensure it's clean and securely connected.
4. Blower Motor itself (less likely, but possible):
* While less common for a constant-on problem, a seized or internally shorted blower motor can sometimes draw power continuously.
* This is usually identified by the motor running even when disconnected from power sources.
Important Notes:
* Safety First: Always disconnect the negative battery terminal before working on any electrical components in your car.
* Repair Manual: A repair manual specific to your 1995 Cadillac Eldorado is invaluable. It will provide detailed diagrams and instructions.
* Professional Help: If you're not comfortable working with automotive electrical systems, take your car to a qualified mechanic. Improper repairs can cause further damage.
The blower motor resistor is the most common culprit in this scenario, so start there. If replacing the resistor doesn't solve the problem, you'll likely need a more in-depth diagnosis.
