I have a 2006 chevy equinox with 105,000 miles. When I hit 45 mph there is a loud humming noise and it goes away when I hit 50 mph. When I decelerate it will get loud again at about 45 mph but will quiet down as I slow dow. The noise is not coming from the engine, it sounds like it is coming from under the car like in the drivetrain. Transmission still feels solid, no slipping, Any help
Find a quiet empty stretch of road. Go 50 mph, put the trans in NEUTRAL and shut the engine. If noise is still there, swing car left and right to detect noise differences. Could be hub or axle bearings. Not engine or trans if noise is still there. Hope this helps
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I have the same problem, had my mechanic look at it. He said it is the 4wd transfer case. I think he said it is the electronics trying to engage the 4wd. He said this is a common problem. Repair costs is about $750.
I would look for loose body panels or even the plastic front air dam found just below and under the front bumper. Sometimes the circulating air makes the paneling vibrate and it will resonate throughout the entire vehicle. Of course there's no way to verify while driving but tightening a few screws and possibly riveting a loose air dam that may have gotten knocked loose while parking or off-road use can't hurt. Next look to the engine mounts and ensure that they are solid and have no cracks that have collapsed the units themselves letting the engine fall. I would then have a mechanic take a look at the carrier bearings on the driveshaft, and have the tires re-balanced. Has the vehicle had an alignment recently?
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