I have no idea where the heater pack is. Since your heater/AC system goes through the Navi, you better let the dealer take a look at this. Is your car still under warranty?
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Comptech Icebox, Headers, Exhaust, Lowering Springs and Sway Bars. Mugen front grille. Inspire tailamps. MOMO Sport 18 X 7.5 +42 offset. Axxis Metal Master front/rear pad. 2 Polk/MOMO 10" subs, Orion Xtreme 500.4 amplifier and Alpine CD changer.