2007 Pontiac G6 Engine: 2.4L L4; 2nd Design; 7 Bolts; Position: Air Conditioning, Alternator and Tensioner;. 2008 Pontiac G6 Engine: 2.4L L4; Position: Air Conditioning, Alternator and Tensioner;. 2009 Pontiac G6 Engine: 2.4L L4; Position: Air Conditioning, Alternator and Tensioner;.