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Take it apart to determine the cause. Only then you will be able to fix it.

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11y ago

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Related Questions

Why is there a hissing noise from the heater controls?

Some systems use engine vacuum to move the control doors. You could have a vacuum leak.


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The blend door is vacuum controlled. Any vacuum leak in the engine system can cause the door to not function properly. Check this system first. The door could be physically sticking but a vacuum leak is a more common problem.


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A good place to start is to check for leaks in the vacuum lines associated with the heater controls. Many of the controls are vacuum actuated & if there is a leak in a control or associated line it may cause a rough idle


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In a 99 Windstar LX the heater blower is stuck in the windshield position I move the selector but nothing changes how do you fix this problem?

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vacuum leak


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A blocked heater hose could cause a leak. A stopped up heater core could as well. Or the connector in the Windstar could be cracked.


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