If that were the case, then he would always have heat since when there is vacum present at the valve it keeps it shut. No vacum opens that valve. Steve --- In dmcnews@xxxx, njp548@xxxx wrote: > Jack, > > Maybe the vacuum line that connects to the water valve that circulates > hot water into the heater core isn't connected. It could have easily been > disconnected by accident. To see if that is the case....when looking > directly at the engine compartment, you will see a very small vacuum line > coming from the drivers side of the firewall leading to the middle of the > back of the engine. That is the vacuum line that goes from the mode switch > to the water valve telling it to open or shut depending on the position the > mode switch is in. Hope that helps. > > Later, > Nick > 1852 > <A HREF="Http://members.aol.com/njp548">Http://members.aol.com/njp548</A>