Posted on 4/28/2025
If your vehicle’s air conditioning suddenly starts blowing the wrong temperature—or the airflow shifts without warning—you might be dealing with a broken blend door. While it’s not the most well-known part of the A/C system, the blend door plays a crucial role in directing airflow and regulating cabin temperature. When it malfunctions, comfort takes a hit—and the problem usually won’t fix itself. Here’s how to tell if your blend door is causing issues and what steps can help get your climate control working properly again. What Is a Blend Door The blend door is a small flap inside the HVAC system that opens and closes to direct air through either the heater core or the A/C evaporator. In simpler terms, it controls whether warm or cool air is sent through the vents—and how that air is mixed. This allows for precise cabin temperature control, which is especially important in systems with dual-zone climate settings. The ... read more