SOURCE: Need to remove the fan to replace the water pump
you need to get a fan clutch wrench to remove the fan you can get one at any local autozone or murphys parts stores
SOURCE: Engine overheating at high rpms
check the casting on your replacement water pump..4.0l engines require a reverse rotating water pump..may be causing your problem.
SOURCE: Overheating engine
Check your oil dipstick for coolant, or a mucky substance. Your symptoms sound like a blown head gasket.
SOURCE: 97 transport 3.4 engine- New radiator,
Are your cooling fans working? that will definately be a problem if not working. if they are working shut car off and feel the radiator is it the same temp all over or is it hot in only top or one smaller area. if you do not have same temp feeling on all of radiator your radiator may be plugged.
SOURCE: I had 2003 Toyota Camry 4 cylinder in for
While it is a possibility, having the tensioner lose tension seems more probable that it locking up as the mechanics have stated. You seem to know what you are talking about, so why not try throwing a wrench on it and turning it towards the serpentine belt? Then you can see for yourself if it has seized or not. It is the small pulley that doesn't seem to power anything like your AC compressor, alternator, fan, crank, powr streering. match a wrench to the size of the bolt and turn it, if it moves take the belt off (noting how it goes) and put the new one on saving you 280 dollars.
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