Sound like you have a fault on the teperature blend door operation !
DESCRIPTION
Heater system is a blend-air type, consisting of a control panel, blower motor and plenum assembly. Blower motor located in plenum assembly, under instrument panel, pulls air from air inlet and forces it into plenum assembly where it is mixed and delivered. Plenum assembly contains heater core, floor/defrost door, panel/defrost door and electric motor actuated temperature blend door.
TEMPERATURE CONTROL KNOB
Temperature control knob controls a blend door potentiometer which controls an electronic temperature blend door motor (actuator). Temperature blend door motor provides a variable number of temperature blend door positions. When temperature control knob is in COOL position, temperature blend door shuts off airflow to heater core. When knob is in WARM position, air is directed through heater core. When knob is in intermediate positions, heated air is blended with cooler incoming air to achieve desired temperature.
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Wednesday, July 29th, 2020 AT 6:56 PM
