1999 Mercury Sable Air Cond. blend door

1999 MERCURY SABLE
95,687 MILES
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CLARK1
  • MEMBER
  • 3 POSTS
I purchased the blend door actuator but before I installed it I plugged it in and pressed the auto temp controls to see if the blend door control moved which it didn't. I'm sure there's a module that makes the blend work but I don't know where to begin troubleshooting.
Jun 28, 2013 at 12:28 PM
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SEANGRANT00
  • EXPERT
  • 334 POSTS
The blower motor switch controls blower motor speed by adding or bypassing resistors in the blower motor switch reistor in all function selector switch positions except OFF.

The blower motor resistor
- is located on the heater core and evaporator core housing near the blower motor.
- has three resistor elements mounted on the resistor board to provide four blower speeds.
- depending on the blower motor switch position, resistance is added or bypassed in the blower motor circuit to decrease or increase blower motor speed.
- has an overheating device (thermal limiter) that will open the resistor coil when the temperature reaches approximately 184 cel interrupting the blower motor operation in ail speeds except high.
- is serviced as an assembly. The thermal limiter cannot be reset and is not serviceable.
Jun 28, 2013 at 12:51 PM
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SEANGRANT00
  • EXPERT
  • 334 POSTS
I'm sorry that was for another question.
Jun 28, 2013 at 12:52 PM
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