Hello, new here, I’ve had my 08 Nitro for a couple years now & I love it. Winter is coming fast here 🇨🇦 & my heater settings remain on one setting regardless of where I have the dial set. I get minimal warm air through the windshield defrost vent, slight air from dash facing passengers and zero coming through for feet or any other vent options. Any suggestions as to what the problem might be before I go to the mechanic & get soaked for who knows how much money without guarantee the problem will be fixed.... I’ve had less then stellar experience with mechanics in my area unless I go in already knowing what the problem is. Thanks for your time & help.