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What would make the air change from blowing out the front vents to blowing from the defrost vents when you step on the gas on a 1995 ford pick up?
Wiki User
∙ 15y ago
I had this same problem. There is a vacuum motor in the engine compartment on the firewall, passenger side near the top (close to the hood hinge). Check the white vacuum line that connects with a black rubber elbow to the vacuum motor. The white vacuum line is routed into a bundle of vacuum hoses that route through the firewall into the vent control switches. In my case, this vacuum line had a leak near the point where it enters the bundle. It seemed that the plastic that was exposed to the engine compartment had disintegrated with time and temperature and was very brittle. I was able to fix it with some small diameter silicon hose. If you peel back the plastic jacket that protects the bundle you should be able to find a point where the white plastic vacuum line is still in good condition.
Good luck.
Wiki User
∙ 15y ago
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