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Just got a chance to do this and the humming is loudest at the throttle body. Barely can hear it at the valve cover.
Thanks again for the responses. Good to know about the inverter pump. I did put a stethoscope on the inverter pump seemed it was running quietly....
Thanks for the responses. I found info on the brake pump and that seems operating normal. Is the thermos pump the same at the coolant control...
It's a 2008 with 225K. The car is making a grinding noise briefly when you first hit the on button. Is this the inverter control valve failing?...
Thank you!
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Trying to post a question but can't add links until I have 4 posts. #1
