I took my vehicle to a friend of mine who works at NTB, and they found that the main cooling fan was not coming on at all. The GM mechanic changed my thermostat as well as flushed the radiator, after doing all that and $550.00 later, the car still runs hot and was overheating even while driving. I have just recently had the same problem. That test is a little harder to do on GM vehicles that have no separate radiator cap, but it can still be done. If combustion gases are present that liquid will turn bright yellow. He will draw air from the radiator through a glass cylinder with two chambers partially-filled with a special dark blue liquid. Your mechanic can do a "sniffer" test to check for a leaking head gasket. Thermostats must be hit with hot liquid to open. Combustion gas leaking into the cooling system will pool under the thermostat and prevent it from opening. The next thing to consider is a leaking head gasket. It's a little too soon to have that problem but if they do, they won't effectively dissipate heat to the air. Also see if the cooling fins on the radiator crumble off easily. That will act like a small radiator and reduce the overheating. To verify that, run the heater on one of the higher speeds. That blockage is a common result of GM's use of the red Dex-Cool antifreeze. If there's cool spots on it, the flushing didn't completely clear the blockage. Next, feel if the entire radiator is getting hot.
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