I had the same problem last year. I had to take my '95 Mark to a
radiator shop. The drained the block, filled the system with new
coolant and put in a new thermostat. It has been fine ever since. I
had tried to add more coolant to the reservoir but after the engine
heated up the tank was empty and my temp gauge was on hot. The
problem ended up being that the coolant was so low in my engine that
I wasn't getting enough of the coolant into the engine causing it to
overheat.... Mike
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