Blend Door
The blend door directs air through the heater core and AC evaporator to set the temperature you feel from the vents. When it breaks or gets stuck, your air can blow only hot or only cold no matter what you select. Repairing or replacing the blend door brings back smooth, accurate temperature control.
Find a TechnicianCommon causes
- Broken or cracked blend door from age and wear
- Stuck door from a failed actuator pushing against it
- Air blowing only hot or only cold no matter the setting
- Door off its track or hinge inside the HVAC housing
- Debris or a foreign object jamming the door
Frequently asked questions
What is a blend door and what does it do?
The blend door is a flap inside your HVAC system that controls how much air passes over the hot heater core versus the cold AC evaporator. It's what lets you set the exact temperature coming from your vents.
Is a blend door problem the same as an actuator problem?
They're related but not the same. The actuator is the motor that moves the door, while the blend door is the flap itself. A mechanic will check both to find out whether the door, the actuator, or both need attention.
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