Pontiac Grand Prix Cylinder Head Gasket Test

Bought A Used Pontiac From A An Ad, Installed New Manifold Gaskets Because Of Water In The Oil. I Also Installed A Radiator, New Thermostat...

Okay, So My Question Is I Did The Chemical Test For The Head Gasket, It Turned A Faint Yellow Until I Turned It Off, Then Went To A Natural...

I'm Looking At Possibly Purchasing This Car For My Wife. I'm Told By The Previous Owner Who Just Bought It For His 16 Y.o. Boy Who Is Not...