Removal Procedure

WARNING: This page is about a different car, the 2020 Cadillac XT5. However, it is still accessible from the selected car via links, so may be relevant.

Remove the radiator surge tank. Radiator Surge Tank Replacement (LSY) , and Radiator Surge Tank Replacement (LGX)
Fig 1: Exploded View Of Auxiliary Fluid Accumulator Components
Courtesy of GENERAL MOTORS COMPANY

WARNING:
The automatic transmission fluid accumulator may be pressurized greater than 120 psi (827 kPa) and fluid may be hot. When servicing accumulator, key must be OFF for a minimum of 10 minutes. Do not open bleeder screw until instructed to do so or personal injury may result.

Remove the auxiliary fluid accumulator (2) from the transmission. Auxiliary Fluid Accumulator Removal