In Reply to: What is this sound??? posted by danny on September 06, 2001 at 13:55:44:
Sounds like the air pump. Mine is pretty quiet, but I've heard a car with the pump bearings on the way out and it was really loud and rattly.
Currently, my air pump is on my workbench awaiting cleaning!
Whenever I start the car from cold, I hear this weird whining sound, after a few minutes it stops... Is this the air compressor that pressurizes the cooling system (my car has the air valve on the expansion tank) or is this something I need to get checked out? Thanx in advance