Engine Coolant Reservoir. Non-Pressurized Coolant Reservoir. COOLANT RESERVOIR. 1995 GMC Sonoma Engine: 4.3L V6; EngVIN: W; w/Dex-Cool Cap; Position: Front;. 1995 GMC Sonoma Engine: 4.3L V6; EngVIN: Z; Automatic Transmission; w/Dex-Cool Cap; Position: Front;.
