If the 66 has the same rear heat setup as a 67, yes you have a heater core, blower and ductwork in the trunk beside the spare tire and it ducts in between where the back seat bottom and floor meet. It is fed by heater hoses coming from the heater control valve that controls fluid flow for the front heater. Dave 67 Imp sedan On Sun, 20 Jan 2002 22:20:12 +0000 "426 Hemi" <daytona426@xxxxxxxxxxx> writes: > > On my 66 Imperial my I am leaking antifreeze in my pasenger > floorboard. > I changed what appears to be the front heater core. Are there two > heater > cores? One for the front air and one for the rear air set up? > Thanks for > any help. > > > Ken > 66 Crown Coupe > > > _________________________________________________________________ > Join the world’s largest e-mail service with MSN Hotmail. > http://www.hotmail.com > > >