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Old 06-26-2001, 04:58 PM
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benzfan benzfan is offline
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Join Date: May 2001
Location: Toronto
Posts: 277
Without seeing the sludge, I can't be sure, but a 1990 likely needs a very good coolant flush. Are there any other symptoms that would indicate head gasket? Engine oil in coolant floats on the top of the expansion tank as small blobs. A sludge and brownish coolant indicates a need for flushing and replacement. If this is the case, you would be best to remove the rad and backflush it for a good while. It's surprising how much can build up in the rad inlet.
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