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Cannot tell from the question if the problem is:Air is not blowing at allAir will not come out the dashboard vents, versus defrost or floor directional settingsSee "Related Questions" below for coverage of both
vacuum leak the vacuum reservoir is below the left head light, check the hoses
Check that the linkage that controls the damper is connected and working. The linkage is just above the gas pedal.
It's not vacuum. Try this link http://www.chrisfransen.com/Ford_Blend_Door_Fix/index.html
If it blows only out the defroster vents : then check for Vaccume leak Rick ASE L-1 Master TransMichigan.com
somtimes a mouse moves into the blower motor and makes a nest ?
thermostat may be stuck open so engine doesn't get hot enough to blow warm air. Had the same problem on a Taurus once
If you are talking about the thermostat in your engine, the two have nothing to do with eachother. If there is no air at all coming out the vents, I suggest it is your blower motor.
Drive it. It will relearn itself. It may take a few drive cycles.
is it because of a lack of vacuum pressure?
the flap on the vent and defroster is stuck somewhere in between so it is not letting proper airflow to where you designate it possibly something sticky has fell down through the defrost vent and is constricting max. airflow
You could always take it to the shop You could always take it to the shop