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Sorry to bump this back up but I've been having the same problem with my '95 lumina. A couple years ago, I had the thermostat replaced and the coolant tank flushed out after having overheating problems. Since then its only overheated a couple times, none of them recently. Today on my way to work and back I could smell oil burning and after checking under the hood, noticed that the coolant tank had foamy bubbles in it and the coolant had turned dark black (from sludge?) from the normal green color. Could this be a head gasket problem or worse?
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