Why does the heat not work in the second & third row seats? I've followed the troubleshooting tips - coolant level is good, blower/fan is working, tried the thermostat changes. Heat is supplied to the front seats but not to the back of the car. I'm guessing it was this way with the A/C also. The passenger floor is wet, but thought that was caused by weatherstripping failure because it is most notable after rain. Have not noticed the sweet smell of coolant.