Question about 1997 BMW 318

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My 318i is making a noise when running, sounds like it is coming from the A/C compressor. Any ideas please.

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  • jrh1987 Jan 06, 2009

    It sounds like its making a beat box noise. really strange noise.

    Thanks for your help.



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I recently had a very similar problem on a 87 318is.
The noise was a whistling/squeeling noise, when listening with a short length of hose pipe the source of the noise could not be positively located.
It seemed to be coming from many areas of the engine.

It turned out to be the PCV causing the problem- it was leaking causing a strong vacuum on the crankcase, which caused crankshaft oil seals to whistle as they leaked in air.

Two giveaway symptoms of this particular problem are:-
1) If the oil filler cap is removed briefly, noise immediately stops,
2) whistle noise continues for 1-2 seconds after the engine is stopped, sounding like something physicly rotating running down.

If you think its a belt squealing hold a graphite pencil lead (very carefully) against the belt face and listen for a noise change.

Note -Take care with the listening hose around the serpentine belt, as it can quickly grab it and dismount the belt - leaving you with another unwanted problem.

Posted on Jun 07, 2009

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Bearing in the a-c ,sounds like it needs a new 1 .not a easy fix

Posted on Jan 06, 2009

  • dwayne sagh
    dwayne sagh Jan 07, 2009

    i hope it's not your timing belt beating on the plastic guards either . use a garden hose to listen through and try and see if it's a jingle noise or chain slapping on metal noise ..good luck hope you find out what's happening before something bigger goes , find a good mechanic u trust diagnosis is probly around 40$



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