I am unsure as to whether the alternator belt also has anything to do with the water pump. But I did have to take off all three belts (power steering, AC, alternator) to get at the timing belt tensioner. Did not replace the timing belt at all, just removed the tensioner and replaced with new one. Timing belt never went slack enough to jump teeth.
Also, the car only seems to overheat while at idle. I noticed it on the way home (6 miles). When I was driving the temp gauge read lower than when I arrived at my driveway and idled, whereupon it went right to red.
All I need now is the rain to stop long enough for me to deal with it. :) That won't happen, though, as we get 120+ inches a year here; so we're in for it for the next few days.
[Also, the car only seems to overheat while at idle. I noticed it on the way home (6 miles). When I was driving the temp gauge read lower than when I arrived at my driveway and idled, whereupon it went right to red.]
From the abovementioned fact, It is most likely that your cooling system is in poor condition, it only depends upon fast driving wind to cool off your radiator, forget about belts, just have a thorough check of the cooling system.
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