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Old 10 Nov 2017, 01:08 pm
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sanatanadharma sanatanadharma is offline
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Default Re: new thermostat but still no heat from heater any ideas

Quote:
Originally Posted by Handy_Cruiser View Post
... The vacuum solenoid for the blend door is behind the glove box. It's usually silver and easy to identify. Just put your hand on it and see if you can feel it working when you change the temp control with the heater on and the engine running. You should feel and possibly hear the movement. ...
Respectfully, the vacuum canister is the actuator for the fresh air/ recirculation control. Vacuum holds the diverter door in recirculation position. When the car is off or the vacuum fails, a spring resets the fresh air/ recirc-door to fresh air position.

The temperature control (air-blend door) works by a direct cable mechanical connection.

All fresh or recirculated air flows first through the A/C evaporator (which cools and dries only when the A/C compressor is operating).
Then the air blend door (temperature control) diverts some or all of the air (that passed through the A/C evaporator) to flow through the heater core as well.

The engine coolant flows through the heater core whenever the motor is running. There is no water flow control.
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