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  1. I have a 1996 STS. 173K miles. The engine is solid, and over the last year I started having overheating issues. My mechanic said I had air in my system. So he bled the cooling system. He was working hard on bleeding the system. Too hard I felt. These cars are supposed to be self bleeding. So I was suspicious. We replaced the thermostat, twice. Car still ran hotter than it should. In stop and go traffic it would run up to 250--with the blower on full blast!! And going up hill it would actually hit red if I didn't turn the blower on. Long story short, after replacing the thermostat, checking the purge line repeatedly, replacing the water pump, my car still ran hotter than it should. One day I read about the heater core busting and coolant showing on the floor of another car. So I asked my mechanic to check out my heater core. We saw a little drip underneath the car, but there was nothing on my floor board. I told him to replace it anyway. Once that was replaced, the cooling system is running tip top! And when he go inside the dashboard and saw the core, he told me it was leaking. Now, my car never goes past the 195-220 mark in normal conditions. In traffic, without the blower on, it doesn't go past the 235 mark, and usually doesn't quote hit the 235 mark. In severe traffic, stop and go, and sitting, it doesn't go past 240ish - no blower on. I am writing this, because I expected to see coolant on the passenger side floor with a bad heater core. The fact is, your core could be compromised and not show signs, and that could be the cause of your overheating. Anyone with overheating issues, solid engine and cant solve their problems, take a look at your core. Adios
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