I suspect that this has come up before - but I have had no luck with the forum search.
When first started, my '97 2L Mondeo makes a high pitched whistle from under the bonnet but once warm, the noise disappears. It's not nearly so audible from within the car, but it came to my attention again this morning when SWMBO borrowed the car for the day and I heard it from the outside.The sound has a rhythm to it (but no tune!) and I wonder if it could be a belt of some sort - though I've a feeling that I had read somewhere about a split pipe.
Has anyone any ideas? It'll have to go in for its 130,000 mile service next month so I can bring it to my man's attention.
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Is it just a whistle, or are there any other symptoms associated with it?
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Sorry about the delay in replying, I keep losing my internet connection and yesterday seemed particularly bad.
Strangely enough, yesterday morning it was hardly noticeable, but it was there again this morning. If the whistle (it could be described as a high pitched squeak) is due to a belt, I wonder if it's friction which is affected by relative humidity.
I can't say that I've identified any symptoms that could be associated with it - those functions that I assume involve belts (i.e. aircon, power steering, battery charging) all seem OK - well, for a 9 year old car.
Thanks Waino
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sounds like the fan/alternator belt slipping whilst putting back the power used to start the engine.
check belt 1 .is tight 2.does not sit in the bottom of the pulley (it should contact on the sides) and 3 it is not glazed or polished as any of these would give belt squeak
for a fiver if any of the last 2 occur then change it
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Water pump or Alternator bearing?
Chris M
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You are lucky in a sense, in that it makes the noise when cold rather than developing later, or only at certain road speeds.
There are two easy ways of starting to pin it down. Try giving the revolving belts a squirt of WD40. It won't be a permanent fix, but if it goes away or changes its note, you know how to fix it properly.
The other is to remove each belt in turn. That will pinpoint alternator, or PAS pump.
It could be a squeaky timing belt. Try giving it a squirt of Halfords nylon lubricant.
Failing any of that, it could be a tiny air leak from a vacuum or intake pipe, or even an exhaust leak.
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Many thanks for the replies. I'll check them out - and if I can't sort it, I'll be getting the car serviced in about a months time.
I'll let you know the outcome.
Waino
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