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when the heater controls are set to defrost, heat, bilevel..., the unit blows to vent and defrost arbitralily when it wants
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The heater control on this car uses engine vacuum to operate the solenoids for the air distribution doors. You either have a broken vacuum line, defective controller, or defective solenoid valve. We would be happy to diagnose the problem for you if you get stuck. James Wallace www.euroasiangarage.com