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The vent function no longer works, i.e. won't blow
I have a 2004 Mercury Grand Marquis. The vent function no longer works, i.e. won't blow air through the vent setting. Seems to be stuck in Defrost/floor setting. What do I do to repair it?
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well, if nothing was disconnected on the ducts and the selector works fine , my guess will be that you have a nest in the fan it self, take it out and clean the nest so the fan can blow full amount of air. good luck.
Check to make sure the engine vacuum is getting to the heater/ac control. Bad vacuum hose or leak. Many vehicles use engine vacuum to move heater doors and controls. When the vacuum is absent, it usually defaults to air blowing out the AC vents.
You do have a leak and it is one or more of the air suspension springs, I have seen this same scenario dozens of times on Ford products with air suspension.
The vacuum-actuated door flap not functioning from either vacuum leak(worn out actuator, bad hose or switch) or it is jammed open with a pen-like object that fell into the ductwork(all of which is under the dash)
needs re-gassing because one line should be hot (feed) and the return cold , This is a specialist job do not attempt to do it yourself because its extremely dangerous with very high pressures involved
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