Question about 1991 Dodge Dynasty
Your mode switch is controlled by vacuum actuators and probably defaults to defrost when it doesn't get vacuum from the engine. Trace the plastic vacuum line from the engine intake manifold to the heater control knob inside the car. Make sure it is firmly connected at the engine and is not leaking. Also check any other hoses connected in that area of the manifold. The line should go thru the firewall and make it's way to the control panel. If you can hear a hiss at the control panel, the vacuum connection is loose or the switch has failed. Let me know if you need instructions for removing the control panel or if you have any other questions.
Posted on Oct 24, 2010
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Posted on Jan 02, 2017
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