What does the water shut motor do? My pass side heat is hot and drivers side is a/c like.. I've read all the post about it being the heater core ,but after looking at it ,the heater core is just a mini radiater.. There has to be an easier way to fix the issue other than taking the car all apart.. How about flushing the heater core? I did the burp thing and it didn't do much.. The car has heat at idle on the pass side 3 vents, but when driving ,they get cooler.. The car is a 00 gt 5 spd.. http://tearstone.com/eclipsefsm/GR00006700-55.pdf 55-36 shows what im talking about..