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Hello, does it only blow through the defroster vent at this time? Is the vacuum hose from the engine compartment with check valve for the air flow system in one piece?
Yes, either you have a vacuum leak on the supply hose that goes inside the firewall or a cracked vacuum resouvoir tank on the back of the ac evaporator core for the system.This will cause it to default to the defroster. If the vacuum line is good but the vacuum tank is cracked, you can install a new vacuum tank inside the vehicle and route vacuum hose to it verses removing the complete evaporator housing to replace it.