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Why does the ac work when parked but when you drive your car it blows hot then cold and idle goes up and down?
Wiki User
∙ 11y ago
Many ac systems use engine vacuum to operate the ac controls. You may have a cracked or disconnected vacuum line that feeds the HVAC system. Check the vacuum lines under the hood, that is where they would most likely be damaged. A vacuum leak would also be the cause of the erratic idle.
Wiki User
∙ 11y ago
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