Heater Blows cold air through center vents?
Hey guys, I've had my B13 for about 6 months now. I understand its august and still fairly warm out, but winter will be here soon enough. My sentra blows cold air out of the center vents with the heater on. The only way I can get the center vents to blow somewhat warm air is by switching the center vents to "closed" as to not let any air through, yet they still leak some warm air into the car. Has anybody dealt with this issue? All the other heater settings work fine its only when I have it switched to vent or vent/feet. Thanks for any help I can get!