Heater Problems

[Burn N' Up]

Having the same problem. I can hear the heater servo vent open in the firewall as i adjust the climate control but I still get no heat. I have actually narrowed the problem down to the heater valve that Russ is talking about. Mine is recieveing vacuum but i'm not sure its recieving enough because it doesn't open. Could the In car sensor be telling the climate control that its already hot in the car, i don't think this is the problem because the climate control cuts the A/C once the car starts cooling off inside so i'm guessing the sensor is good. Any guesses on mine? Also since i'm hear, does the solar sensor just up the A/C when you face into the sun? Could my water temp switches be telling the car its not warm enough yet so don't open the heater valve? The repair manual doesn't really even discuss the valve on the firewall so i don't know quite what to do.