How would i pressure test the cooling system in my 1997 chevy lumina (3.1L)?
Well, it depends on what kind of set up you have. If you have an older style system (the radiator cap is connected to the top of the radiator), then its as simple as going to your local auto parts store (such as Autozone) and renting a coolant pressure tester pump. Just attach it to where the radiator cap goes and pump it up. Be sure not to put too much pressure in the system (look on your radiator cap for max psi, which is usually about 12-16psi I believe). Once it is pumped up, watch the gauge on the pump. If it remains pressurized for several minutes, you don’t have a leak (the needle stays the same on the gauge). If it loses pressure, check all around the engine and radiator to see if there is any coolant leaking out. If you see coolant coming out, it is an external leak (which you can pin-point in that case). If it loses pressure and you see no coolant whatsoever leaking out, then you have an internal leak, which is not a good thing. Being that it is a newer vehicle, it most likel
