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I had similar problem with a Mercury Tracer I owned I had two problems with mine, One the thermostat was faulty(was old and rusted out) and the temperature sending unit wasn't working right ( Fan did not come on at needed temperature 205 degrees) so I had to replace them both.

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Q: Your 1999 SLS keeps running hot you have replaced the thermostat the water pump backflushed the engine and flushed the radiator what now?
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