

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 ProviderDual-zone systems control each side with its own door and actuator; when one fails, that side stops blending in warm air.
Usually not — it's typically a small actuator or a recalibration rather than a coolant or heater-core job.
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