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After a long drive in Austin traffic and 100 degree heat, my new 4-row radiator puked its guts out into my new recovery tank (after the engine was turned off). Sure was glad I installed that thing!

But then after a lengthy, hot drive today; I was surprised to see it hadn't sucked any of the overflow back in.

My question is: do I need a special type of cap on my radiator for it to function well with a recovery tank?

Thanks!
 

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Yes. What you need is a open-style radiator cap (mostly what you find in the part stores these days), designed for a coolant recovery tank. This cap has two valves, one of which allows coolant to come back into the tank. The old style caps only had one valve to allow water to leave, never to return.

I put in a new cap, and it didn't allow water to return. It was the correct style, but defective. Also, check the top of the radiator where the cap goes to ensure it is free from debris.
 
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