Dont know if this is any help but I had a problem with cold air coming through my center vents. I took a welding rod with a hook bent in the end and with a SMALL flashlight in the other hand, reached in and closed the vent. Take a peek in and see if you can do that which will keep you from freezing for now 
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1985 Euro 240D 5 spd 140K
1979 240D 5 spd, 40K on engine rebuild
1994 Dodge/Cummins, 5 spd, 121K
1964 Allice Chalmers D15 tractor
2014 Kubota L3800 tractor
1964 VW bug
"Lifes too short to drive a boring car"
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