How do you fix defroster?

To fix a defroster, first check the vehicle's fuse box for a blown fuse related to the defrost system and replace it if necessary. Next, inspect the defroster vents for blockages and ensure the blower motor is functioning properly by testing its settings. If the issue persists, check for refrigerant levels or leaks in the air conditioning system, as these can impact the defroster's performance. If you're unable to resolve the issue, consulting a professional mechanic may be necessary.