I have a 2003 chevy trailblazer, How can i tell if my water pump is bad? whenever I accelerate there's a loud vibration sounds like the fan is loose.
Most likely the idler pulley
remove the drive belt
there is a pulley just below the alternator that's the idler pulley
you may be able to spin the pulley and hear the noise if not
remove the pulley 13mm or 15mm bolt after u remove spin the pulley on you finger there will be a roughness or a grinding noise
replace the pulley
hope this helps
Most of the time when a pump goes bad in starts to leak after you shut off the engine. May not be much and it may or may not leak enough to see it on the ground. Look around the water pump and see if you can see any wet spots and look at the water pump it self and it has weep holes one on the bottom and top see if you see any leakage from there if so the pump is bad
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