986 Forum - The Community for Porsche Boxster & Cayman Owners - View Single Post - Squealing sound coming from engine compartment

gogotodorov · 03-24-2011, 03:52 AM

I have a squealing sound coming from the engine compartment.
When the car is started from cold there is no noise. After approx 15 min of driving (car up to normal operating temp 180-190) the squealing starts barely noticeable at first. After that squeal intensity increases until it is always there regardless of throttle position. It changes in pitch and intensity with engine load/rpm.
The squeal is present when moving and when stopped at idle and with or without belt. Also, squeal is not affected by clutch position, engaged/disengaged.
I have replaced the AOS and J tube but squealing still remains. This did not solve the problem and I am out of ideas. The car still runs well with no noticeable loss of power even when noise is present. Car idle is good, oil and coolant levels normal, and no fault lights are on.
Car is a 1998 with 70k miles. I am out of ideas on what to check. Looking for suggestions. HELP!!

Thanks,
Here is a sample of the noise:
http://www.youtube.com/watch?v=MJ8K7H_JWlg

03-24-2011, 03:52 AM	#1
gogotodorov Registered User Join Date: Jul 2010 Location: bg Posts: 4	Squealing noise coming from engine compartment I have a squealing sound coming from the engine compartment. When the car is started from cold there is no noise. After approx 15 min of driving (car up to normal operating temp 180-190) the squealing starts barely noticeable at first. After that squeal intensity increases until it is always there regardless of throttle position. It changes in pitch and intensity with engine load/rpm. The squeal is present when moving and when stopped at idle and with or without belt. Also, squeal is not affected by clutch position, engaged/disengaged. I have replaced the AOS and J tube but squealing still remains. This did not solve the problem and I am out of ideas. The car still runs well with no noticeable loss of power even when noise is present. Car idle is good, oil and coolant levels normal, and no fault lights are on. Car is a 1998 with 70k miles. I am out of ideas on what to check. Looking for suggestions. HELP!! Thanks, Here is a sample of the noise: http://www.youtube.com/watch?v=MJ8K7H_JWlg Last edited by gogotodorov; 03-24-2011 at 04:17 AM.