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What could cause a loud squealing? replaced serpentine belt and tensioner?
1999 Chevrolet Silverado 1500

What could cause a loud squealing? Replaced serpentine belt and tensioner?

(1999 Chevrolet Silverado 1500)
1 answer & 0 comments
Popular Answer
on April 19, 2015
Belt Squealing/Noises can be Diagnosed with a Spray Bottle of Water....With the Engine Running Lightly Mist the Grooved Side of the Belt with Water......If the Noise Disappears or Lessens, but then Shortly Returns, the Problem is Probably a Misaligned Pulley.....If the Noise Immediately Increases After the Belt is Misted, the Belt is Slipping.

Another Diagnostic Trick, and that is Reversing the Belt.....Take it Off and put it Back On so that it Travels in what would have been its Backward Direction as Originally Installed. If the Noise Goes Away or gets Much Softer, the Problem is a Misaligned Pulley.......This Diagnostic works because Flipping the Belt Changes the Direction of the Misalignment from the Belt’s Perspective. If Reversing the Belt Does Not Temporarily Eliminate the Noise, the Problem is something other than Misaligned Pulleys.
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General Diagnosis
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on April 19, 2015
Belt Squealing/Noises can be Diagnosed with a Spray Bottle of Water....With the Engine Running Lightly Mist the Grooved Side of the Belt with Water......If the Noise Disappears or Lessens, but then Shortly Returns, the Problem is Probably a Misaligned Pulley.....If the Noise Immediately Increases After the Belt is Misted, the Belt is Slipping.

Another Diagnostic Trick, and that is Reversing the Belt.....Take it Off and put it Back On so that it Travels in what would have been its Backward Direction as Originally Installed. If the Noise Goes Away or gets Much Softer, the Problem is a Misaligned Pulley.......This Diagnostic works because Flipping the Belt Changes the Direction of the Misalignment from the Belt’s Perspective. If Reversing the Belt Does Not Temporarily Eliminate the Noise, the Problem is something other than Misaligned Pulleys.
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