I've noticed if you have the climate control set to let in outside air and not recirculate, it allows air to come in while the car is moving. If you have it set to warm, this could let air warmed by the heater core into the cabin.
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1987 N/A MA70 Supra <--1JZ swap in progress
1986 AE86 GT-S Hatchback
2002 DC5 RSX Type S
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