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Might be the control switch, but that is unusual. Most likely it is the vacuum hose going to the damper controlling the defoger. If it was the vacuum line to the control, then it would blow defog all of the time.
It will not be the ac as it is cooling
It will be a problem climate control module and vent control system.
might be a vacuum hose that was disturbed during the hose replacement.
your heater core is possibly stopped up if there has been a radiator leak and stop leak has been poured its definetly clogged or could be a faulty thermostat
Common question on this site. On late model cars, the vents are controlled by blend door motors. Small electric motors open and close doors to direct air flow. Chances are you have a blend door that is stuck or a failed motor. The default position is the defrost to make sure the windshield is always clear. Someone will need to look behind the dash to see if all of the doors will move on demand.
you should know this is easy problem , open up the control AC/blower device and melt with soldering all points over the circuit it's easy don't be scary
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