I have had problems because my volvo 4.3L v6 with raw water cooling system does not seem to get warmed up all the way the heat risers do get alittle warm but it doesn't seem to be very warm and while flushing engine water coming out of the engine is warm but also doesn't seem as hot as should be. needle pretty much never moves from cold band on indicator. Thermostat has been changed. the engine seems to run fine but I am worried that this could be a damaging situation or does the engine just run that way????? Temperature indication works fine but always stays at cold.