I got a new radiator which has an overflow outlet to the right with a pipe running to the reservoir which was the same setup as my old one. However on my new one there is a small opening which looks like another overflow outlet below the fill up valve. What happens is whenever I turn on the engine, coolant pours out of the second outlet and thus I cannot keep the cooling system filled.

Did I get the wrong radiator or am I missing another pipe that will keep the coolant circulating.

I can take pictures if needed to make more sense.

 

If your old radiator had nothing connected to that port then that's the wrong radiator. Maybe plug it?

 

I bought a new one and it had the same extra plug.I just plugged it and it has been like that for 3 years now with no problem

 

What did you plug it with?

Just don't want it blowing out.

 

Find a brass or other material plug with threads of the same size. Use Teflon tape to seal the threads.

 

Home Depot, plumbing section.

 

It had an extra nipple on it like a hose would.I took a piece of hose,stuck a bolt through it and hose clamped it on the radiator and where the bolt went in the hose.Didn't look to good but it worked