For service and parts needs, visit your dealer. You will receive genuine GM parts and GM-trained and supported service people.
Genuine GM parts have one of these marks:

California Proposition 65 WarningHeated Seats Description and Operation
Heated Seat Components
The driver and passenger heated seats each consist of the following components:
Left heated seat switch
Right heated seat switch
HVAC control module
Seat heating control module
Seat cushion heating element
Seat back heating element
Seat cushion ...
Refrigerant Recovery and Recharging
Special Tools
GE-45037 A/C Oil Injector
For equivalent regional tools, refer to Special Tools.
Warning: To prevent personal injury, avoid breathing A/C Refrigerant
and lubricant vapor or mist. Work in a well ventilated area. To remove refrigerant
from the A/C System, use service equip ...
Transmission Indicators and Messages
The following transmission-related indicators and messages may be displayed on
the Instrument Panel Cluster (IPC). For a complete listing and description of all
vehicle indicators and messages, refer to Indicator/Warning
Message Description and Operation.
"TRANSMISSION HOT IDLE ...