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john -aka eauto
john -aka eauto, ASE Certified Technician
Category: Subaru
Satisfied Customers: 16048
Experience:  15 years as a auto tech
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My name is ***** *****. I own a 2007 WRX STI "hawkeye".

Customer Question

Customer: Hi, my name is ***** *****. I own a 2007 WRX STI "hawkeye". During cold weather (0 to -10 Celcius) there is a loud whining noise coming under the hood. Power steering fluid and pump is ok, transmission etc is also fine). Noise increases during accelerating, but there is no loss in power and speed, car just works fine as it should, but the noise is quite horrible. Even after long ride when motor has heated up, whining noise is still there. I have had EVO 7 and 8 and Mazda 6 MPS but hav not heard similar sound. This is my first Subaru. Maybe it is normal, but just to make sure, I want second opinion (local Subaru dealer serviced car and they said everything is fine). Thank you.
JA: Thanks. Can you give me any more details about your issue?
Customer: Please let me know what kind of details are necessary.
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Submitted: 1 year ago.
Category: Subaru
Customer: replied 1 year ago.
It doesn´t matter what gear I use. Car is stock, no mods made.
Customer: replied 1 year ago.
If the car is not moving, parking brake engaged and you rev up a bit, the noise is still there and increases as rpm increases.
Expert:  john -aka eauto replied 1 year ago.

did you duplicate the noise for the dealer?

Customer: replied 1 year ago.
I did. At first they thought there is a problem with transmission but later mechanic "found" it was power steering. Well... Power steering stopped making sound, but that was not that awful sound compared to what made me ask here. Might it be faulty air pump or still might be a problem with turbo?
Expert:  john -aka eauto replied 1 year ago.

I would isolate the problem with a mechanics stethoscope.. We need to pin point the noise and that's the easiest way..

simple listen to each component until you isolate the noise..