Most likely the seal between the heater box and the demister ducting. There is a foam seal between the joint that degrades over time and will let the air flow out under the dash instead of up the ducting. It is a dash out job to reseal. The heater box stays in the car and the demister ducting is attached to the underside of the dash.
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2001 V40 2.0lt Sport lux - Daily Driver. 174k miles.
2003 C70 2.4 GT Convertible - Garage Queen. 65k miles.
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