SOURCE: Cadillac Escalade
i had the same problem u need to take off and clean the throttle body and it clears right up
SOURCE: cadalac escalade, when key turned on,engine not
It could be the fuel pump pressurizing the system. Does the sound stop after a few seconds? If it is the fuel pump then it is a normal sound. Fuel pumps will resonate in the tank when you are low on gas, making them sound louder. If it is more than a hum then I would get it checked out.
SOURCE: Horn doesn't blow loudly on 2002 Escalade
It's possible that the horn exit passage is plugged with debris, but these things are usually a sealed unit which must be replaced. There should be two horns that blow together located one on each side of the radiator--if one is dead, the sound is greatly reduced. Some horns have an adjustment screw that will optimize the sound level. Hope this helps!
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