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Forgive me if this info has already been posted somewhere;
My VW Passat has a "secondary air intake". It's a small blower that pumps fresh air into the exhaust, after the turbo, before the cat, and is suppose to heat the cat quicker on cold starts.
At startup, it turns on (sounds like a hair dryer) for about 30 seconds. Sometimes it will turn on again for another 15 seconds.
Just something for you guys to think about.
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-Addicted to Chaos-
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