VY 3.8 strange radiator leak

[BigGez]

Hey there, I've been trying to find information on this but to no avail. I have a strange coolant leak coming from what looks like an empty socket/hole for something (I will attach photos) it's directly underneath the pressure cap and it seems to be letting air into the system which will then cause a cup or two of coolant to spew onto the ground after driving (out of the overflow reservoir I assume) I have replaced the inlet manifold gasket a few months back as I'm aware that they go often, I also got a new thermostat and tridon pressure cap so i'm fairly sure they aren't the culprits. The place it is leaking is where I've put red RTV silicone, I thought it was seeping through the edges but i think it's coming out from inside the hole, it looks clean in the photo because its been washed, I want to know if I can completely plug up this hole with silicone to stop it leaking out of there, or is that a bad idea? Thank you everyone.

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[Immortality]

That is for the transmission cooler that is build into the radiator. There should be another fitting at the bottom of the radiator tank. You can block it off but ideally you'd get a replacement radiator.

 

[BigGez]

That is for the transmission cooler that is build into the radiator. There should be another fitting at the bottom of the radiator tank. You can block it off but ideally you'd get a replacement radiator.

Cool, I will block it off for now and hopefully not need to get a new radiator. Just wanted to make-sure I wasn't doing something stupid, thanks a lot for your help.