chances are the radiator. water pump possibly. anything to do with the thermostat housing. the housing itself or the regulator.
The radiator could be plugged or a couple of the internal coolant passages in the engine block could be plugged. Try back-flushing the radiator and the engine and see if that helps.
Blow on it. If that doesn't work, turn the engine off.
Your Trailblazer may be running hot because your fan is no longer working. It may also be running hot because your don't have coolant in your car.
Maybe : a crack in exhaust manifold that closes when hot.
If you are sure the engine is not running hot then it could be a bad coolant temp sender.
system running hot fans not running
It could be that the radiator cap is not able to maintain pressure. Check the radiator cap for cracks or any other damage. Replace if necessary. DO NOT remove the radiator cap when the engine is hot.
Did u check your enigine cooling fan?
oil is thinner when its hot, that's why.
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oil is thinner when its hot, that's why.
could be an air lock in cooling system could be vac operated valve faulty sticking