Might be the blend door actuator. That's What opens or closes the floor, defrost or cabin air flow inside the cabin. Search and Read online about how to determine the reason for your problem.
Replaced intake twice do to STUPID COOLING WATER inlet design flaw. None OEM parts are generally JUNK & DON'T LAST ! especially from China! EG: power window regulators , sensors , +++.
Install wiring from Kenwood radio on Town car 2006 Cartier with Alpine system to power amplifier in the trunk which I believe needs to be reduced to 5 volts, using original factory speakers. Need specific wire colors and location, please.