Lsgun1

My 18 has the carbon eith dark gray radio surround

Interested in shipping to 01821 if you don't mind checking.

It would sound like a hydraulic power steering pump low on fluid. It would change with engine RPM.

Should not change oil pressure.

Check fuel pressure.

Highly unlikely both the BCM and the heated seat elements were both at fault. Its even strange for all of the heated seat elements to fail at the same time.

I'd check the battery charge first.

So did the temp gauge not come up at all? Broken thermostat can cause this.

Sunroof drain tubes come detached and clogged on anything with a sunroof, not just chevys. I avoid sunroofs at all costs personally.