Question about 1998 Ford Expedition
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Posted on Jan 02, 2017
SOURCE: 97 mustang air conditioning
Many auto cooling/heating systems use a "blend door" which mixes both
hot and cold air to provide air at the temperature selected with the
temperature control. When the temp control is in the full cold
position, the blend door moves to a position which allows only cold air
to pass into the cabin/passenger compartment.
That blend door is generally operated with engine primary [unmodified intake manifold pressure] vacuum. IF there is a leak in the primary vacuum line system, then at low engine RPM the leak may bleed off the vacuum necessary to hold the door in the cooling position. Then when driving, the vacuum will be much higher, "over riding" the leak, and allow the vacuum motor, which operates the blend door, to hold the door in the proper position and provide only cold air to the cabin/passenger compartment.
Posted on Jun 24, 2008
You probably have a vacuum leak on the passenger side. its a small plastic hose some times they come unpluged from the engine. or brake.
Posted on Jan 05, 2009
I know from experience that if the coolant is to low ( not just the freon levels in the compresor but the antifreeze/coolant level as well) the AC system will not cool and will blow hot. Check the coolant Antifreeze and freon levels, even with the Coolant being a little low my 1998 Ford E150 Van will blow hot. After you have ruled out of these possibilities and the chance it is the thermostat most likely the problem is what Ford calls the "Flap" it controls the air flow through the vent system when you switch from Heat to AC. When the Flap is working it closes off one systems air flow so as to not interfere with the current climate selection.
Posted on Apr 17, 2009
air condtioning is controled by vacum it sould be a valve under the dash on the passanger side try moving them with the air on to see which one it is
Posted on Aug 12, 2009
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