I have a 1997 chevy Blazer which has a ringing sound coming from it at around 40mph?

Don't answer it.....LOL

Ok,..sorry...
Anyway,can you tell/isolate where the sound seems to be coming from?
Front,engine area,rear,dash area?
I know its probably hard to tell at 40 mph....can you better describe the sound?
Does it seem to be affected by vehicle speed? in other words increase with speed,decrease on deceleration..?
Does it go away when braking?

Sound is coming from under the dash area, when you lift off the gas petal or apply the brake the sound stops.
It is a metal ringing sound.

Guess: Something loose or rusted with exhaust? Try tapping parts with a rubber hammer, jockey system at tailpipe it might show up with something like that??

T
Tom Greenleaf - MetroWest Boston - USA
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http://www.autoacsystems.com/tomgreenleaf/

Just thinking..
Have the brakes been check for wear?
Possibly the wear indicator on the brake pads sounding off.
That sound will go away with brakes applied.
Just a thought.

Jim