Q: How do you adjust the air from cold to hot

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I just need to know if the air adjusts with the blend door or a heater control valve

My car has 150000 miles.
My car has a manual transmission.

Hi there:

Heat is controlled by a heat control valve. The lever for this valve is located on the dashboard of most vehicles; and typically has a color coding to indicate colder (blue) or warmer(red) temperature controls. Electronic temperature controls are also supplied this way to the heater control valve, but instead of a lever it’s a button that allows you to set a desired temperature.

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