2003 pontiac bonneville se (not supercharged)
I have a knocking noise coming from the rear of the enging. I have tried letting up the tension on the belt but the noise did not go away. Now the weird part i have a loud squealing noise coming from the bottom portion of the engine. whats weird about it is when i pull the dip stick out and it sucks air into where the dip stick goes the noise stops completely. Im stumpped please help!!!