Yes. It's a pull knob like that, although all the heater knobs look the same. You're probably correct that it allows fresh air to enter the cabin. However, I'm not sure if it should be used in conjunction with the "Temp" knob that adds heat, or if opening the "Air" knob defeats the purpose of heater by bringing in cold, unheated air. To be honest, the Vette has unfortunately been in the garage all winter so I haven't had any opportunity to experiment with the heater controls. Can't wait for warmer weather!!!
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