jbc3 Posted September 10, 2006 Share Posted September 10, 2006 I have a couple of questions about the heater control valve in my 78 280Z. It is a manual valve (not the vacuum actuated valve). Which fitting on the firewall (engine side) is the inlet and which is the outlet? Is this valve supposed to bypass the hot water completely from the heater core when in the "cold" setting? Could I be backfeeding the heater core if the water is being pumped in the wrong direction? I con't seem to find any decent pictures or flow diagrams of the heater core and control valve. My heater core still gets very hot even when the setting on the dash stays in the cold position. The Cold - Hot slide control on the dash moves the arm on the heater control valve. I just don't know if it is out of adjustment, broken or maybe I have the hoses backwards. Quote Link to comment Share on other sites More sharing options...
AK-Z Posted September 11, 2006 Share Posted September 11, 2006 Don't know about all the other stuff, but (facing the car from the front) the left side, I believe the top is the outlet and the bottom is the inlet. I'll check later to make sure. Quote Link to comment Share on other sites More sharing options...
jbc3 Posted September 11, 2006 Author Share Posted September 11, 2006 Thanks, please let me know. If I didn't get any response, I was just going to swap the hoses to see if the direction made a difference. Jody Quote Link to comment Share on other sites More sharing options...
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