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Jim Grant Tech Tips Jim Grant Tech Tips
A collection of helpful articles based on reader submissions
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  Jim Grant's Tech TipsJim Grant's Tech Tips
Below is a collection of Jim Grant's Tech Tips sorted by Vehicle Make. These Tech Tips were answers to questions submitted to Jim by users over the course of many years.
If you have any questions, please feel free to email us.



Lincoln - Mercury
  Jim Grant's Tech Tips

Water Pump Squeal
Q: I have replaced the water pump on my car twice in the last week, and it is failing again. There is a horrible squealing noise upon acceleration. My question is, is the noise coming from the water pump? (Plenty of water, new hoses, belts not slipping.) The new pump has not started to leak out of the weephole...yet. Maybe I just bought a bad pump the first time, but surely not twice (its brand-new, not a rebuilt). The old owner put stop leak in the radiator. maybe, the pump is not getting good flow? However, the car does not overheat. Would a water pump, not getting good flow, make such a sound? The bearings are supposed to be sealed anyway, right? Would running straight water through the pump without antifreeze cause the pump to squeal and fail?.... Joe

A: I'm not convinced that you have a water pump problem. The possibility of three water pumps causing a belt squeal, is far too difficult to accept. There is something else that you're not picking up on. I would suggest a closer inspection of all the fan belts. If your vehicle is equipped with the flat serpentine type fan belt the tension settings are critical to proper belt performance. Many vehicles with serpentine type fan belts also have an automatic belt tensioner. A weak or failing belt tensioner will cause the fan belt to slip and squeal under acceleration. Stop focusing on the water pump and look at the whole picture, the answer to your problem is right in front of you.

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