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Discussion Starter · #1 ·
so I've got an Astra coupe, it's the z22se engine.. Noticed something weird on the air intake, no idea what it is or does.. Looks a bit like a thermostat, spring loaded, bolted into gearbox side of air intake... What does it do? I asked a mechanic and he was stumped too, said he'd never seen one on a car either.

I'll try and attach a photo
 

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