hey guys, i was driving last night in my new older 95' and was running the heat and kept feeling a shot of cold air on my face. i had my daughter put her hands under the dash and there was cold air coming in thru the heater box vent all the way to the right of the passenger cab! is this normal? or is there something stuck open? heat in this thing has been an issue. blows somewhat warm but doesnt really seem to flow very well out of the lower 2 vents.