Question about 1999 Ford Ranger SuperCab

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When the air conditioer is on it blows out the defrost

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  • Ford Master
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Does this only with ac setting?
Reason I ask is if it is blowing thru the defroster vents then you have a vacuum leak.Defroster is the default postion(no vacuum).
If it does it when ever you turn on the heater or ac it would most likely be a leak in the supply line(small black vacuum line) that is under the hood and runs thru the firewall at the heat core area. If it only does it when you set the ac then it will be one of the blend doors under the dash leaking most likely.

Posted on Apr 15, 2009

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Posted on Jan 02, 2017

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