Your gauge said 225, you shut the engine off, still with the radiator cap off, and it didn’t blow coolant all over? 50/50 antifreeze/water boils at about 223, and I’d think it would have instantly boiled over if it was really that hot.
If your elevation is higher the boiling point will be lower. At 5000 ft our boiling point is 10 degrees or so lower.
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Lee Peterson
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"I didn't expect a kind of Spanish Inquisition...!"
'69 Cameo White RA III Judge, 4 speed, owned since 1977 -- my first car.
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