Heater Warm On One Side Only
On a dual-zone climate system, one side gets warm while the other stays cool. This is usually a blend-door actuator or control issue on the cool side.
Find a TechnicianCommon causes
- Failed blend-door actuator on one side
- Stuck blend door
- Climate control module fault
- Lost calibration after battery service
- Wiring/connector issue
Frequently asked questions
Why is one side warm and the other cold?
Dual-zone systems control each side with its own door and actuator; when one fails, that side stops blending in warm air.
Does this need major repair?
Usually not — it's typically a small actuator or a recalibration rather than a coolant or heater-core job.
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