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Why would air only blow out of the defrost vent on a Ford Tempo?
Wiki User
∙ 15y ago
The first answer is correct and heres where the leak most likely is. Under the hood, against the back firewall close to the middle, you'll see a vacuum tree. Several hoses plug in here. Both the Tempo and Topaz I've had this happen to, occured here. Look for a unplugged hose or a cracked or dry-rotted hose and replace as needed.
Defrost is the AC/heat system's default position. Likely you have lost vacuum to the control head. When there is no vacuum to control the functions then it will default to the defrost vents.
Wiki User
∙ 15y ago
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In many cases leaves can cause smoke to blow through the defrost of a 1990 Ford F 150
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