Engine heat is pouring into the cab of my car when I turn the fan vent ON for anything. It pours right by any air conditioning, fresh air, etc...making for a miserably hot ride. What up?When the fan vents are OFF, the heat seeps through, as you can feel it on your hand if placed over any vent. Please do not direct me to a nearby Volkswagon dearlership as I have had very bad experiences with aforementioned. I like a private mechanic, where they're willing to show me what they're doing, so I know what to do next time and to earn my trust! Thank you very much!