Question about 1997 BMW 318
My 318i is making a noise when running, sounds like it is coming from the A/C compressor. Any ideas please.
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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Posted on Jan 02, 2017
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