Sierra 1500 2WD V6-4.3L (2008)
Cabin Ventilation Grille: Service and Repair
Pressure Relief Valve Replacement
Removal Procedure
Use a flat-bladed tool to pry the pressure release valve from the cab back panel.
Remove the pressure relief valve from the vehicle.
Installation Procedure
Align the pressure relief valve into the opening of the rear cab.
Press the Pressure Relief Valve into the Cab Back Panel until the locking tabs are fully seated.
