Damn Brian, your technical and I mean that in a good way..Try all of the different positions on the control, just see if it goes to vent, floor, defrost, do this in low and high fan. May even want to touch the hoses to see if you have hot water going and coming to the heater
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When the coolant in the heater core is hot from the engine and your fan is on hot air will blow through the hot fan coil, i figured it out, when i stepped on the gas i could here the coolant squeezing by the control or limiter valve, because the higher rpms make the belt spin faster which makes the water pump pump harder causing more pressure, so when u idle that hot coolant will cool down from the fan blowing on it, u need to find the control valve and open it up to full blast, then hot coolant will always be flowing through your heater coil. ;)
I think these cars have dual climate control. Basically, the driver and passenger can set their own climate. Some like it hotter than others, is the thinking. If this is the case, you need a new climate control module. If not, I am at a complete loss.