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My Heater knobs aren't working. I have checked fuses and everything seems ok.

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Depends on the model and year, but most controls are cable operated.
Some are vacuum operated.
If they all don't work, then I would suspect a cracked vacuum line, to the controls from the intake manifold, or after the control and before one of the vacuum servos, for a servo that is on. Turning everything off is a good way to tell if the leak is before or after the controls, is something starts working.
These are some of the common types of heater water valves, if you want to see the difference between cable and vacuum operated types.

Posted on Jul 18, 2010


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