As per my post on 7Up's thread my radiator has also failed, this is the 2nd in a total of 4500 miles, they seem to be doing approximately 2000 miles between failures. Although that's a sample of 2, my original replacement rad from the build was also dodgy, so possibly 3.
I've checked the radiator this morning and it's failed in the same position very top passenger side vane in against the end tank. There is a pattern here, and I'm wondering if there is a design flaw which goes back to my original kit etc.
When I was sent my kit what I understand is the revised radiator wouldn't fit under my nose cone, not by millimeters, but by centimeters. Caterham eventually stated they'd switched radiator designs and sent me a new rad and additional hanger (see image). The new radiator design is still mounted using bobbins, but the hanger for the top bobbin is solidly mounted, and well look at the images for proximity to the top hose and the point of failure. There is actual contact between the hanger and top hose.
Based on comments from the 7Up's thread, I checked for vibration, and yes there's a notable resonance in the rad at tick over which disappears once the engine spins up. So I'm left considering if CC inadvertently missed something with the new hangers? I'm no mechanical engineer, but surely this is a smoking gun? The point of the solid mount, is the point of repeated failures.
Has anyone else got a 420R S3 late 2018, which has similar hangers?
I'm trying to attend the Taffia so will need to source a replacement radiator, but at £600 (CC Parts) per 2000 miles this is just silly. I need to come up with a solution/improvement to resolve this interference while maintaining fitment under the nose. The club has always been an invaluable source of information and support, hope you can all assist.