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  1. Stale smell vs heater exchanger??

    Coupe, Spyder, GS
    Recently I started noticing a "stale" smell coming through the vents. Can't say that it's exactly coolant and I don't have any dripping in the wells and my collant remains at Max (with no filling anytime recently. Is there potentially anything else besides the heater core/exchanger I should be...
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