So, I was looking over my truck the other day and noticed that the radiator on my F250 has two ports below the cap. One hooks into the overflow, the other one's capped off. It's a fuel injected 460 and I read some other posts saying that the lower one was supposed to connect into the throttle body. Funny thing is it looks like something's already connected to that. I put some pics in.

Here's a pic of the radiator with that extra port:



And a pic of the throttle body:


And here is a pic of where that hose is going:


So my question is, if that's already going into the water pump, do I need to hook that port up to the throttle body at all? If not, I can just keep it plugged off? The only problem is, those plugs break down awfully fast and I have to keep replacing them or coolant will spray everywhere.

 

Radiators often have multiple applications.

I also have the same port you have, but a carburetor.
So there's REALLY no place for it to go.

My radiator also has the transmission cooler on the side, but I have a manual gearbox.
Those fittings just have plastic caps to keep the junk out.

I wouldn't worry about it

 

If you don't like the longetivity of the material used for that cap on the radiator tank, make your own from a piece of hose along with a cut-off bolt clamped into the end.

The cooling hoses to the throttle body are there to keep it from icing up during certain atmospheric conditions.

 

Thanks for your replies, gentlemen. I figured that's what the coolant hoses to the throttle body were for, I just didn't know if I had to had the port from the radiator tank running to it. It seems the coolant hoses are already on the throttle body and going into the coolant via the water pump, and a port near the thermostat. As far as capping off that port on the radiator (you can see the current plug that is hose clamped on to it is already breaking down), I'll take a spare piece of hose like you said and clamp it onto a bolt or something. That should stop it from constantly needing to be replaced. Thanks again.