The Cv joint in the front axle has worn out and needs to be replaced. Most of the time it is cheaper to replace the whole axle than to rebuild just the joint itself. I would suggest that you investigate the bearing(s) at the top of the strut tower. If the popping occurs when you turn the steering wheel, then it is this bearing not the CV joint... the CV joint will make noise as the front wheels are turning. Your question seems to indicate the problem when turning the steering wheel. It could be one or both of the bearings on either side. Judging by the year, this could be the problem. It requires dropping the strut and replacement of the bearing then a wheel alignment for either one or both bearings.
tires are out balance or may have bad cv joint
remove headlight frame you can see it then
Most likely it is the front axle joint
The 1990 Cadillac Sedan DeVille is front wheel drive. The 1990 Cadillac Sedan DeVille is front wheel drive. The 1990 Cadillac Sedan DeVille is front wheel drive.
The 2007 Cadillac CTS has 42.4 in. of front leg room.
The 2013 Cadillac Escalade has 41.1 in. of front head room.
The 2009 Cadillac CTS has 38.8 in. of front head room.
The 2014 Cadillac CTS has 42.6 in. of front leg room.
The 2015 Cadillac Escalade has 64.9 in. of front shoulder room.
The 2014 Cadillac Escalade has 41.1 in. of front head room.
The 2012 Cadillac Escalade has 65.2 in. of front shoulder room.
The 2008 Cadillac Escalade has 64.4 in. of front hip room.