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the heat blows out the defrost when it should blow out floor vents only
In many cases leaves can cause smoke to blow through the defrost of a 1990 Ford F 150
if its winter first check coolant lenvel and check coolant system for leaks. then check thermostat
YES!!!!!!!!!!!!!!!!!!!!!!!!!! Blow it up
Joe Blow
There is no 1995 ford Expedition!
A fan in the system.
on your car it is a defalt mode for air to blow out defrost when there is no vacumn from the engine so you should look for a broken vacum line or see if it has come unplugged on the engine.
you have a vacuum leak. defrost is the default when a vacuum leak is present.
you have to trick the ac computer by shuting it off then restarting it...
You have vacuum line leaks somewhere.
The default for heaters is to go to defrost if there is a problem in the system. You will have to get under the dash to find the problem. Probably best to take it in as they can get tricky without diagrams depending on the system