All that I've ever seen do.  The only exception migt be the few that had 
factory air.  Dealer added air has the valve I'm pretty sure.
    Loren
In a message dated 3/30/2005 10:30:38 AM Pacific Standard Time, 
mark at shepher.fsnet.co.uk writes:
> Did all Mk1 Rabbits have the heater shutoff valve?
>