Not too hard. Just pull on the tensioner (counter-clockwise) and remove the belt. I usually get it to slide off the waterpump or a pulley with no grooves just to make it easier. Then check the rad. support for the proper belt routing and reinstall. IIRC, the bolt on the tensioner is a 15mm, but its been a while since I had to do mine.
Jay
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These are highly engineered precision vehicles, the first step in diagnosing the problem is to strike the suspected offending part sharply and repeatedly with a blunt object, then re-test.