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Even more than stones, the problem is small insects (mosquitos, etc.) gradually clogging the radiator's fins.
Any summer evening drive gets a lot of them - and you can clean your dirty windscreen, but I haven't found an easy way to unclog a radiator - so, after a couple of years, quite a bit of cooling efficiency gets lost. This affects both the engine and the A/C.
Years ago in one car I could reach the radiator from behind and blast compressed air through it. You would not believe the amount of stuff coming out of the fins!
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