Why does my 2001 audi a4 blow neutral air temperature, same degree when air condition or heat is on?

the air blows, its just not hot or cold. I have added coolant. the buttons to adjust the temperature are electric with a electric display of temperature. What could cause this?Why does my 2001 audi a4 blow neutral air temperature, same degree when air condition or heat is on?Hm, get the car to a mechanic or out of what you said i can just think of a electrical problem.Why does my 2001 audi a4 blow neutral air temperature, same degree when air condition or heat is on?sounds like the tmp sensor is faulty to me you would have to let a garage look at it to be sure