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Why would your 1997 Chevy silverado heater not be able to switch the airflow between floor defrost vent or mix?
Wiki User
∙ 15y ago
If your Silverado is like most other cars today, it will use vacuum hoses to change the distribution between each setting. The vacuum in the hoses is created usually by the engine, and transferred to the switch you use in the cabin. Now if there is a slight split or crack in one of the hoses or one is loose this will lose the vacuum, which is why it will not change setting because there is no negative pressure to force the setting to change.
Wiki User
∙ 15y ago
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