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Anytime I run the A/C or defrost, I hear a hissing noise coming from behind the dash. It doesn't go away until I turn the blower off. My assumption is that my evap is on it's way out... Please tell me I'm wrong.
I have the same issue..i have a chrysler 300 which is part pf mopar family..when i have the defroater on my windshield fogs for a sec then goes away i hear hissing..once i take it off defrost use the heater it goes away...what should i do