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1990 911 Cab C4 Exhaust smell in car when top is down,not when top is up

Heating and Ventilation

Vehicle Information: Model: 911 Cab C4; Year: 1990; Body Type: Cabriolet; Total Mileage: 120,000;

I seem to get an exhaust smell in my car with the top down. It has not happened when the top is up. The only thing I can think of is the heat was on when the top was down.

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