Ford Focus makes a whistling noise when warm

Car: Ford Focus
Variant: 2.5 st3
Model Year: 2007
Categories: Leaks & Noises
my focus st3 makes a whistling noise when it warms up checked all the pulleys and belts every thing ok but just by chance I took the oil filler cap of the car while the engine was making the noise and running and the noise goes any ideas what this could be
Posted: Apr 17, 2014 (10 years ago)
Check all air , vac , breather etc hoses and pipes for leaks / drawing air .
Posted Apr 17, 2014 (10 years ago)

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