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I got a small piece of hose (probably leftovers from the parts yard) and clamped it on the second, unused, overflow outlet. I just plugged the other end with a piece of brass I had lying around and put a clamp on it as well. Worked great, thanks for the information on it.
Did you read the previous post to see what he did? Maybe there is a rubber cap in the “HELP” section at the parts store that will work. Every replacement radiator that have purchased came with a cap to block off that port if you didn’t use it in your application. Don’t forget to use a hose clamp. It is below the seal on the cap and is pressurized.
I dont know why you revived this thread, but if you must know what its for, it T-s into the heater core line(not sure if it was inlet or outlet, I believe inlet...) and its purpose is to reduce gurgling noises and potentially help with flow. The noise I think was the primary. I dont think its really necessary, but thats what it does. here is a 4.9 with the outlet, i think, to the heater core
I always thought you use the top one with an overflow tank or the bottom one with an expansion tank.
that may be true somewhere but the function of expansion tank sometimes is the only thing on a vehicle, sometimes only overflow, sometimes both. depends on how its all setup. It is ostensibly just a place that allows coolant to return to the radiator the reason isnt really that huge. the top one is controlled by the cap spring/element which will expose or block the opening based on pressure
The lower connection allows air to be purged from the system. It's easier to purge than trying to get the system to push the air through the heater core and back down through the water pump. Notice it connects to the highest hose in the cooling system.
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