Edmunds Answers



  • MrShift@Edmunds 11/28/09 8:37 pm PST

    Not sure but you may have the dreaded 3.4L intake manifold leak.


    "From the mid-1990s to 2003 these engines are involved in intake manifold gasket defects which caused coolant leakage often leading to engine failure. A series of class action lawsuits, implicating deterioration of the nylon/silicone material of the gasket are pending on this issue. Tell-tale signs of such eventual related damage are a white foam that appears on the inside of the oil filler cap and the gradually increasing loss of antifreeze coolant (due to seepage into the intake passages which will lead to engine lock up failure in such cases). External seepage is also found near the valley edge of the lower intake manifold."

    Source: WAPEDIA --http://wapedia.mobi/en/GM_60-Degree_V6_


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