Well, rolled home from CT to RI tonight. The heat issue is unchanged. What controls the amount of heat? If I put the temp on "max" and set the fan on low the air coming out of the ducts is quite warm even at highway speeds. There is just not enough of it to warm up the car. If I turn up the fan higher it cools off leading me to believe there is not enough flow through the heater core? Is there a valve or something that controls the amount of hot water or air (however this system works)?? Help!! Its in the teens here and I need to drive this thing!! Someone here has to know how this works? Thanks, RT