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Thermostat is the wrong temperature range for the vehicle or it is installed backwards. It is opening too soon and not allowing the vehicle engine to come up to operating temperature soon enough. Have system checked, replace thermostat with correct temperature for vehicle
more than likely your losing cold water from your water system, make sure your water pump is up to scratch...sounds strange, but you need cold water for heat through your air conditioning...
If there is cold air coming out the heater than there is air in the system. After you replaced the thermostat did you run the engine at idle with the radiator cap off until the engine came up to operating temp? Doing this will purge the air from the system.
It is likely that the thermostat has failed and is stuck wide open as a failsafe. This jsut happened to me last week in my VW golf. Your engine will never come up to temperature but as long as the thermostat stays open it will not overheat either. Change the thermostat ASAP in case it the failsafe doesn't keep open and you overheat the engine.
To check if it is the thermostat run the car and when the temp starts going up turn the heat on full blast in the car. If the temp goes down after you turn the heat on than it is your thermostat.
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