Trying to figure out the control of the heater. I heard they had a manual control valve - was there also one with a slider control on the dash? I only have two controls, FAN and DEF.
1. Where does the manual heater valve mount?
2. Can I add a slider-control to my dash and use the other valve, the one that operates with a cable?
3. How do you determine which heater core is correct? With "re-circulating air heater" or "fresh air heater"?
