What is the normal temperature for a 1998 buick lasabre?

had the thermostat and heat sending unit replaced due to lack of heat .Now heat works great ,but the temperatrure gauge shows a reading of 240 or 250 degrees when the car is in motion,took it back to mechanic,they checked everything and said this is normal,as long as the fan kicks on and cools it down,and it does that.Should I be concerned?What is the normal temperature for a 1998 buick lasabre?444;

Yes you should be concerned. Try another mechanic. All engines heat up to 212 degrees (the point where water boils), which is normal engine operating temperature. The maximum temperature of the best thermostat is 190 degrees, which is the point where it opens up to flow coolant through the cooling system from the radiator. Your temperature gauge should be reading between 180 and 190 degrees with the 190 rated thermostat. Since yours reads that the engine is over heating; then this means that the radiator coolant needs replaced; and the mechanic (if a real 1) should have known this. The complete cooling system has to be drained, completely flushed out and refilled with new coolant. The very best mixture of antifreeze to water is 1/3 to 2/3s.....that's 2/3s of antifreeze and 1/3 of water. Many non-mechanical people believe that a 50/50 mix is good; but it's not the best mix. Finally with the gauge reading so high; it sounds like maybe your coolant is almost all water.What is the normal temperature for a 1998 buick lasabre?190掳-195掳FWhat is the normal temperature for a 1998 buick lasabre?Most engines today are designed to operate within a ^normal" temperature range of about 195 to 220 degrees F. A relatively constant operating temperature is absolutely essential for proper emissions control, good fuel economy and performance.



Anytime temperatures climb beyond the normal range, the engine is running in the danger zone. Your gauge could be wrong. Get the actual temp taken to be sure.