Lately my 2001 VX won't blow air from the air condition or the heater whether it s on the hi or low settings or on auto. This would happen occasionally when I'd try to switch it on while driving but now my air won't blow. I hear a click as if something has engaged but no air blows out. When the vent is open hot air or cold air will blow through at the temperature I set. Any ideas? Has anyone experienced this?