got all my blowers fixed and got heat !!!! buuuuuuut going down road today and it was very cool outside i found i have cold air coming in from under my seat. have looked while stoped but can"t find where it"s coming from while i am stoped. any clues , short of cramming a towel under the seat to seal it off.i have checked what i can without removeing the seat and hope i will not have to. thanks in advance for any advice.