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Low coolant level would create a low/no heat condition.Operating temperature would be affected by a stuck open thermostat along with coolant passing through the heater core where the heater obtains its "heat".
Make sure you have the coolant level at the correct level in the bottle resorvoir. If there is not fluid to circulate in the system, the fan will only blow a cool or lukewarm temperature air. If there is enough coolant, check that the water pump is working.
With the engine cold check the coolant level. Add as necessary. If the coolant gets low enough the first thing to stop working is the heat. Accelerating will push coolant into the void and provide heat until you slow down and then the coolant drains back into the motor.
If you have lost enough coolant to loose heat there is a leak. Some common areas are the rear heater lines under the passenger side of the van, the water pump, and the radiator.
If I understand you correctly, your temp gauge shows correct operating temperature, your blower fan blows air that you can feel with your hand from the right floor or dash outlet, but that air doesn't feel warm until you are moving?
If so, several possibilities come to mind. One is that your coolant level is low. Even though your temp gauge reads in the right range, the coolant level could be low enough that it doesn't reach the heater core until there is enough engine RPM to create more pressure from the water pump and force what coolant is there toward the heater core. Another possibility is that your heater controls are not able to do their job. A stuck flapper in the duct or a malfunction with the temperature control system could be causing the problem, and at 15-20 MPH there is enough air coming through the outside air vents to provide some heat.
I'd check the coolant level first, though. The other possibilities are more far-fetched.
Check your coolant level. When the coolant gets too low this light will come on. If there is plenty of coolant and the light is still on, you probably need to replace the coolant resivouir because the sensor has gone bad. The sensor is located on the coolant resivour and must be replaced as a whole. You can find one for about 60 bucks and is a easy fix. You can do it yourself. Just make sure you replace the coolant with correct Audi coolant.
This issue is observed in the Car's having Faulty Thermostat. But according to you, the thermostat is new but the new one can be defective. But OK, let us take it as fine. If the Thermostat is all right then the Problem may be in the Coolant. Check that the Coolant is correctly reaching the Heater Core. If no, this issue can be observed. Also check that the Coolant is not dirty of the Heater Core is dirty or clogged. Also check the HVAC which is the Heater Control Valve. It can be the point of failure. And also the main thing, are the Fans working ??
Kindly check the above locations and reply me if the issue is not resolved. Also the issue can't be resolved by oneself. You have to get a Certified Technician for it.