Question about 2001 Cadillac Sts
Head gasket IS a possibility but not always a probability. There are also the possibilities of a failed thermostat low coolant level without a warning light or simply a faulty radiator cap. A thorough diagnoses is definitely in order here.
Posted on Apr 10, 2011
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Posted on Jan 02, 2017
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If you overheat an engine with a cast iron block and an aluminium head, they will expand at different rates as they have different expansion coefficients. This will usually cause separation of the gasket and if you are losing coolant, it's a near certainty. The answer is a new gasket (pennies) plus a head skim at a local engineering shop, $100 or so (otherwise it won't seal again). You need a torque wrench and a workshop manual to check the torque settings and slackening/tightening order if doing it yourself, otherwise you'll cause further warping of the head. If the head isn't skimmed, it will go again after 50 miles or so.
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