Running hot after partial coolant change

RustyRatRod said

I answered that already. There is air trapped around the thermostat causing the thermostat to remain closed.

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Joey4speed nailed it. I wasn’t thinking of the spring in the cap needing to be depressed in order to allow coolant to flow into the reservoir. I’m kinda slow, sometimes folks need to spell things out like I’m 5. And then explain it again. Lol