If not AC then power cable grommet in firewall or the door power cable grommet is leaking. old style checking is to lift carpet and look for snail trails in dust, or throw a heap of talc powder around then hit the outside with a gurney with someone inside looking for tell tales.
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2015 WK2 CRD Laredo( ZG, WG 2.7 )
Your Never Too Old To Learn Something Stupid.
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