2004 Monte Carlo
I have a 2004 Monte Carlo LS with 150K miles. When started it will go a few
miles and the temp gauge gets to the red line. Then after driving further drops
to 50% where it stays. Thermostat has been replaced and I haven't noticed
any coolant leaking. But the wife did add coolant weekly. Auto shop says the
block is cracked but "could" also be the radiator. Since they were not
confident in the problem I'm struggling to decided if I should replace the
radiator or not.