1995 GMC Sonoma Owner's Manual - Page 199
1995 GMC Sonoma Manual
Page 199 highlights
How to Add Coolant to the Radiator when the cooling system, 1. You can remove the radiator pressure cap including the radiator pressure cap upper radiatorhose, is no longer and hot. Turn the pressure cap slowly the left until it first stops. (Don't to press down while turning the pressure cap.) If you hear a hiss, wait forthat to stop.A hiss means thereis still some pressure left. 5-15
We apologize, but we cannot currently deliver this PDF manual by request of the manufacturer.
We apologize for any inconveniece.