Question about 2003 Ford Expedition
All the air from the heater or ac goes through the defroster duct. the rear air works fine. and it does it through all the setting on the dail.
You have a vacuum leak going into the truck. On your dash there is a knob that allows you to go from floor to dash to defrost. This knob is controlled by vacuum from the engine. The default position for the HVAC system is the defrost setting. There is a small black tube (about 1/4 inch in diameter). Pop the hood and look on the passenger side of the engine compartment near the fire wall. This is where this vacuum line usually runs through into the cab. If you can not see any line going into the cab then start tracing all the smaller lines (1/4") coming off of the engine. There will be red, green and black ones. The red and green ones are mainly for emission control. If you trace then out you will find the one with the problem. it will be broken, kinked or perhaps disconnected.
Posted on Nov 16, 2008
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Posted on Jan 02, 2017
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