Wolfrpi, my 944T would do that - temperature fall off at highway speeds. Did not do this until this winter. So, I took the thermostat out to check it. Thermostat was ok but the gasket behind it was worn out. This permitted a small amount of water to flow at all times. As the pump was old I opted to replace the pump along with the two thermostats. Thing gets put back together this weekend.
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