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Vehicle is making a whistling noise

Tiny
CHANGAJEEP
  • MEMBER
  • 2003 JEEP GRAND CHEROKEE
  • 4.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 225,000 MILES
So the vehicle is making a whistling noise, similar to sounding like a family of birds living under the hood. So first off, I replaced the serpentine belt (which was fairly warn). The noise continued. Then I noticed a slight coolant (or condensation) (at this point I am not exactly sure which). So I replaced the water pump, and now it is over heating. Took it around the block and the temperature reached about 240. I have yet to change the thermostat, but it wasn't overheating before I changed the pump out. What could have caused it? So; new Belt, new water pump.
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Monday, October 28th, 2019 AT 8:01 AM

1 Reply

Tiny
STEVE W.
  • MECHANIC
  • 13,452 POSTS
Welcome to 2CarPros. I would check that the belt is routed properly first, then start the engine and make sure everything is actually turning as it should. A squeal could be caused by a bad belt, or a bad accessory like an alternator or power steering pump that has failing or failed bearings. Next, if those are all okay, I would drain the system and remove the new pump and look at it to be sure it's a good part, there are a lot of bad parts out there.
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Monday, October 28th, 2019 AT 8:38 AM

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