Quote:
Originally Posted by Ilma
The humming noise sounds like the boost control solenoids bleeding air. They are located just behind the coolant tank, so that's where the noise is probably coming from - not the coolant tank.
Would be a good idea to replace them soon. Not expensive and not hard to diy.
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they were replaced almost 2 years ago but i figured it might be the left one that was making noise but i didnt want to say anything because i wasnt sure, glad someone confirmed it !!