Blower Motor: Description and Operation

Blower Motor Speed Control
The blower fans are heavy duty motors with impellers attached Speed is varied by controlled switching of resistances in series with the motors. The right hand unit has the ambient temperature sensor mounted in the inlet duct. Air flow control flaps are operated by a vacuum actuator situated in the side of the inlet duct.

Blower Motors:

Function: To deliver air, either fresh or recirculated, to the heater/ air conditioning unit. Fans are four speed - First speed is on automatically in AUTO and LO. Other speeds are MED 1 (2nd speed) MED 2 (3rd speed) Recirculation/High speed (4th speed).