2005 Buick Park Avenue Questions

All 2005 Buick Park Avenue Questions

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I found 2 external torx under front pulley.Is that it?
It's not the gas cap. Could changing the Canister Purge Valve solve the problem? I reset the code about 4 times per tankful of gas.
The blower tends to work intermittently. It gets warm and stays on once it decides to work. It is not set on "auto."
Will not start after the crank sensor gets hot.