hi i have a 2001 volkswagen jetta and well my problem is that i am not getting very hot air when i have the heater on and i am getting very annoyed with my mom always complaining about how she doesnt like the car and i can put it at max air and max heat and still only gives warm air. i have asked a few people and they say that it can be the thermostat or the the a/c button isn't working but the a/c is. and when i press the button to turn off a/c, a/c stays on even if it says it's off.