2017 Mack GU5 Engine: 8.9L L6 DIESEL; Position: Fan, Air Conditioning, Alternator and Water Pump;. 2013 Mack GU5 Engine: 8.9L L6 DIESEL; Position: Fan;. 2014 Mack GU5 Engine: 8.9L L6 DIESEL; Position: Fan;.
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