Corvette Magazine

This is the hole that appeared in the aluminum expansion tank. When I looked through the opening down into the bottom of the tank, I saw numerous pits forming. Each one of the pits will become a hole.

Here is the new Rad-Cap with anode that Zip supplied. It is amazing how simple this is.

it occurring to Corvette owners. Any vehicle has an average of 1.5 to 2 volts at all times in the cooling system. Start the engine and the voltage will increase from 5 to 7 volts. This constant voltage in the cooling system will, over time, eat a hole in the softest metal, namely aluminum expansion tanks, radiators, freeze plugs, etc. What are we Corvette owners to do? The answer is simple. Make a call to Zip Products (800) 962-9632 www.zip-products.com. They now have a new Rad-Cap especially designed to combat this problem. The new Rad-Cap has a magnesium anode attached which hangs down in the cooling system liquid. Magnesium is a better conductor of electricity and will draw the constant voltage away from the aluminum parts. The anode will be sacrificed instead of your aluminum expansion tank or radiator.
Using this radiator cap is a simple and effective way to combat electrolysis. An added benefit is that because you should check the anode every 30 days, you will also be more aware of your cooling system and have a tendency to maintain it. For all you show car owners, you can also use the Rad-Cap before