2001 Toyota Celica Questions

Unanswered 2001 Toyota Celica Questions

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RPMs has to be 3,000 for heater to blow hot air. When RPMs drop the air cools off. ??
So i know that when a charcoal canister goes bad it can effect the catalytic converter. But I was wondering if anyone knew how long roughly it could take to do that?
where is the shift selenoid located?is it hard to replace?