On my 1999 Lincoln Town Car AC only blows through defroster and heater vents.
After taking the dash out to replace the heater core air only blows through defroster and heater vents.Wont blow through upper AC vents?Cant figure out what I left undone or whats going on.Vacuum line?Electrical?Any ideas appreciated.
A vacuum operated mode door system that reverts to defrost ducts has lost vacuum. When other ducts also operate, it can be a two stage vac. operated door issue, or even a control vacuum switch issue. It's best to inspect your work to find it or get the service manual info and go step by step.
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