Piston Slap: The Envoy’s High Pressure Mission?

Dave writes: Hello Sajeev, I have a 2004 GMC Envoy, 4.2-liter six-cylinder, with about 123k miles that seems to be leaking coolant from somewhere around the radiator cap. Every time I come to a stop with the windows down or pull into the garage I can smell antifreeze. The radiator appears full and the reservoir […] The post Piston Slap: The Envoy's High Pressure Mission? appeared first on The Truth About Cars. from The Truth About Cars http://ift.tt/Jh8LjA