Quote:
Originally Posted by simonjedrake
As regards the compressor sound, the only semi-noticeable sound is when the car auto lowers upon ignition switch off - though still not sure if that sound is from a release valve letting out air in a controlled manner or the actual compressor pump?
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Lowering the car doesn't involve a compressor as such, so it is probably the relief valve.
Although perhaps not intentional, I like to hear when the car goes down.