Pontiac Fiero 1988 Service Manual page 1066

AIR CONDITIONING: AIR DELIVERY
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The Heat/Defrost Door routes to either the
Heat Vent or the Defrost Vent with a slight air
bypass in either position. An electric actuator
operates both the Mode and Heat/Defrost Doors
as controlled by the A/C Mode Switch.
The actuator consists of a non-reversing elec-
tric motor, a mechanical drive train and a rotat-
ing contact assembly which can break the motor
circuit in any of four positions. When any of the
Mode Switch buttons is pushed the motor is en-
ergized through the contact assembly. The motor
will then run until the contact assembly opens
the motor circuit and the motor stops at the se-
lected position. The actuator motion is trans-
ferred to the Mode Door and Heat/Defrost Door
by two spring loaded telescopic links.
The Outside/Recirculating Door has two posi-
tions, allowing either outside air or recirculated
air with a portion of outside air into the blower.
An electric actuator similar to the Mode Door
Actuator, but with only two positions, operates
this door.
The Mode Switch contains the contacts re-
quired to select each of the seven modes.
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