Car used to get to normal temp (90) and stick there until turned off, after the water pump failed last winter and the temp got to 100 (no higher) the pump was replaced and now the engine temp gets to 90 and stays there but with no cabin heat at all, if I ease off and drive at 55mph (much better fuel economy)the engine temp drops and we get warm air from the cabin heater.
Ps water pump failed by impeller spinning on its shaft which apparently is a common failure mode but no debris went into the system.