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I recently replaced the engine in my truck. It is a somewhat built 400M. When I put the new engine in I was having problems with it heating up. I have replaced the rad, thermostat and temp sensor. I thought I had the problem figured out until last night coming home I turned the lights on and the temp heated up. Any idea why this would happen or what would case it? I decided to see if it was really the lights that did it and if I turn them off the temp goes down, and if I turn them back on the temp comes up.
That sounds like a realitively common gauge cluster problem. Some fix it by cleaning the connector on the back of the cluster, others by replacing the regulator back there.