Some Gm thermostats have a wax "pellet" inside that when overheated, melts and renders the thermostat junk, replace thermostat just to be safe.
Also some vehicles collect a tremendous amount road debris between radiator and AC condenser mounted in front of it.
Remove cover retaining radiator, and check between them.
I always remove the radiator and clean the junk out between,
and back blow the outside of radiator with air pressure after washing with water several times. It is unbelievable what gets stuck in the front side of a rad.
it is also a good idea to back blow the AC condenser to remove debris and carefully straighten bent fins with a fin comb.
Do not use high pressure water from a pressure washer, as you will destroy the fins.
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