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It seems to Me that, the heatercore is not functioning properly. Its just like a radiator, the hot water runs through the core, once the thermostat opens at it's set temperature and having the blower motor on, it should blow out hot air.
Heater blowing cold air until I get on the interstate, then it works; however, when I stop at lights it starts blowing cold air again. The temperature gauge will be in the middle but the car will still be cold until the car starts moving.
sounds like you have a malfunctioning blend door the blend door is what allows you to get cold or hot air out of the HVAC system you might have a blockage or a malfunctioning servo motor. hope this helps you
first, make shure that the water level in the radiator is apropriate, then ck the thermostat for oppening and closing(you wont have a heater if the thermostat is constantely open) ck the 2hoses that suply hot water to the heater core, both hoses must be hot when engine is runing .if one off the hose is cold ,the hot water is not circulating to the core and back to engine .ck the valve , see if you can by pass it and see the results if you have heater , replace the valve. nicolas
You have 2 zone temperature control control. The heater control valve has
failed and is open allowing the passenger side heater core to stay hot. It
is a very common problem and expensive to repair. It tends to be an intermittent
problem and sometimes will work properly.