[toolboxchev]

A radiator can look all fine and dandy by opening the cap and looking inside. Color of the coolant can even look great yet when you drain it from the bottom is will be a nasty brown color.

How do I know this! Been there. Most all coolant flush products are not that good at removing stuck on corrosion inside the radiator. Look at the ingredients of Prestone Super Flush. Sodium Citrate.

Everyone says Aluminum in Radiators are great products. With the old Copper and Brass Radiators you can use products like Sodium Hydroxide, Oxalic Acid to flush your system with no harm to the internals on the block. They must be neutralized.

Back flush the entire system and pull your drain plugs on the engine block when you do.


A lean setting on the carb will make the motor run hot also. I had this and a couple other issues like a cracked manifold, and other problems too.