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I’ll guess the OP does not have a pressure tester. He is trying to avoid taking it to a shop if he can DIY. I support that. Maybe eventually he will buy a pressure tester or maybe the free tool you can rent at autozone includes the correct tank cap fitting, but for now, suggestions would be good. I asked about recent work because if the thermostat was changed, an o-ring or small hose fitting could have been damaged. If the fan was removed, the plastic section of the hose that runs across the top of the radiator that gets brittle with age could be leaking. People have also damaged the lower radiator drain plug when doing a coolant change. And the suggestion about checking the WP weep hole, assuming there is one, or just under the pump in general, is a good one since pumps don’t last forever. Does the OP smell coolant in the car or under the hood?
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