car is running well-starts good
coolant-added two times in 2 months car temp gauge normal
on 2006 Chevrolet Impala SS
Pressure test the cooling system for leaks. If you don't see a leak at about 16-20 PSI, check for one at lower pressure too (about 7-11 PSI). The 5.3L V-8's have had a common water pump leak occurring. Just something to check.