So, last week I took the RS out for a quick trip to my sons school to pick him up. Got on the highway, goosed the throttle and blew the upper coolant hose off the radiator. Thought I might have broke the plastic outlet off the radiator, but luckily looks like the hose just came off.

So I put the hose back on, at least I thought I did, and waited for my coolant pressure tester to arrive. Got the tester, pumped a little over one bar of pressure into the system, and checked the upper hose. It literally blew off again when I wiggled it a little bit.

So, am I being a dummy, and not putting it on correctly, or is there something else. I looked online, and found out that you apparently can not get a new OEM one anymore. Great. So, what should I do. Replace gasket? Replace the metal "C" clip?

Any thoughts?