98BlackSierra
Lifelong Chevy Owner
Has to be thermostat I would think...for $7 throw a thermostat in there asap as insurance.
tstat and gasket is super cheap and super simple to replace, I'd definitely start there.
I agree 100%. The more I’ve been thinking about it, the more it makes sense. I believe it’s the original. I’m also going to grab a new thermostat, temperature sensor, and flush the system since it still has the original Dexcool.