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clean out the drain under the windscreen and ensure that the drain hoses down inside the mudguards are not blocked . ON the dash controls close the vent to recirculate the cab air and not allow fresh air into the cab.
Could be a blend door problem. The blend doors under the dash direct air thru the heater core and the vents. Are you sure the center vent is not blocked off ?
Usually a sign of a faulty blend door under the dash. The blend doors direct air thru the heater core and the vent outlets. One blend door is directly behind the radio.
behind the center counsel between the floor and the heater housing is a part that is called the blend door actuator. these usually go bad and have to be replaced.
is the fan motor working at full speed
check for blocked cabin air filter
the vacuum only works the vent controls and as you can feel the changes of the vents , it is not vacuum
linkage inside dash or relay for electric front vents went bad
linkage sometimes comes off its holder from usage this is normal there only held in by a upin under the dash
if electric the relay for the the top vents needs replacing this i believe will be with rest of the relays in engine compartment
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