OK, great article thanks. Guess I was wrong about a vacuum line going from the dash controls to back outside the firewall to the hot water control valve to run hot water to the heater core box. It sounds like it is a cable that does that, I'll have to take a closer look. Thanks for the help. Mike in New Mexico '64 Dodge Polara 500 -- [Non-text portions of this message have been removed] ---- Please address private mail -- mail of interest to only one person -- directly to that person. I.e., send parts/car transactions and negotiations as well as other personal messages only to the intended recipient, not to the Clubhouse public address. This practice will protect your privacy, reduce the total volume of mail and fine tune the content signal to Mopar topic. Thanks! '62 to '65 Mopar Clubhouse Discussion Guidelines: http://www.1962to1965mopar.ornocar.org/mletiq.html.