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Underhood air is certainly warmed by passing through the radiator, and also from the engine itself. Of course the engine actually has to be warm for this to occur.
Last night I timed a cold start on my Rendezvous. It took 30 seconds, on the nose, to switch from open to closed loop. And yes, heated O2 sensors definitely speed the process up.
So I am not sure I see the point of a WAI (on a car with modern EFI). Unless, of course, one simply wants to run something like a cone filter in the engine bay so that you can hear all the intake hiss and drone.
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2004 Alero GLS (and a few others)
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