Mark, To answer your question, they are supposed to have it.Some have been eliminated and the vacuum pluged up. John Hervey here is what it looks like. http://www.specialtauto.com/delorean-images/heater-control-valve-new.jpg -----Original Message----- From: id [mailto:ionicdesign@xxxx] Sent: Sunday, August 17, 2003 8:23 AM To: dmcnews@xxxxxxxxxxxxxxx Subject: Re: [DML] Re: Vacuum line question On the back of the engine behind the right head if you are looking at the back of the car. It is on the opposite side of the Distributor near the coil box but closer to the bell housing for the transmission. I am told not all Deloreans has this shut of valve. Mark michael townsley wrote: > Where is the heater core shut off valve? > > Michael W. Townsley > # 17043 > townfour@xxxx > > > -----Original Message----- > From: content22207 [mailto:brobertson@xxxx] > Sent: Saturday, August 16, 2003 10:17 PM > To: dmcnews@xxxxxxxxxxxxxxx > Subject: [DML] Re: Vacuum line question > > Mechanic hooked up wrong. He's running vacuum backwards through mode > switch. > > Line operates heater core shut off valve. Is only active in Max A/C > mode. Runs from passenger intake rail (one device of many on big 3/8" > line), through mode switch, under console in hard plastic line, out > driver's pontoon, to heater core shut off valve. > > Bill Robertson > #5939 > > >--- In dmcnews@xxxxxxxxxxxxxxx, "aaron_t_graham" > <aaron_t_graham@xxxx> wrote: > > There's a lone vacuum line that comes into the engine from the side of > > the engine compartment -- toward the back, on the left side. It's > > quite lonely back in that part of the engine compartment, so it's easy > > to see which line I'm talking about. > > > > If I have this line disconnected, everything still seems to work just > > fine.