The one on my 88 just sux.  In the winter, more cold air comes out than
hot...............The heater core does not leak, it seems more cold air
leaks around that box than goes thru it.....................close one flap
no difference........

Adam P
Charleston,SC     Coburn, WV
81  Westy "The Brick "
70 Single Cab "Whitey"
74 Beetle "Ol Yeller"
73 Transporter (STILL at paint shop)
1988 Vanagon Wolfsburg
1976 Transporter (New CA bus)
1974 412 "Goldmember"
Used Vanagon Parts for sale (mostly aircooled)