In a message dated 98-11-20 20:45:39 EST, ron@NETCARRIER.COM writes:

<< Actually it was a BA4, not a BN4 - a heater which is a direct cousin of the
 BA6 used in Busses and Vanagons (same electronics, differently shaped
 combustion chamber, many interchangeable parts). The commercial failure of
 the Type 4 was possibly due to in part the fact that U.S. luxury car buyers
 generally expected air conditioning, >>

whoops...knew it was a B something 4 .. :<)   anyway - i actually have seen a
'74 411 with air conditioning...it was an option.
PS, any of you who ever see a type 4 in a junkyard - you can usually snag the
gas heater out of it pretty cheap..

chris