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How do you figure out why the heater and blower work but the ac and defroster do not?
Wiki User
∙ 12y ago
The HVAC doors that control the airflow are activated by small vacuum motors. The system is designed to fail safe; this means that the system will fail in full defrost mode. So, knowing this and the fact that you have heater but no A/C or defrost you should assume the system has a failed control head (the part that you select functions with with button or lever). Or the doors are stuck due to an warped duct system (usually high heat related).
Wiki User
∙ 12y ago
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