My 2004 Camry is just shy of 300K. I bought it new off the lot. Never had an issue with heating/cooling in 12 years, so I have never pulled the cap on the radiator. I write this just to show how long you CAN go without issue.
Side note: I see Automotive places offering free tests for such things.... I am sure they have a catch, but if you know a little about your vehicle I am sure you can drive away with an answer.
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