Radtec Radiator replacement for a Sigma engine

[themanalive]

After suffering my second leaky plastic top Caterham radiator on my Sigma 125 SV, I decided to opt for a Radtec radiator. So, I bought one from sevenspeed with the fan mounts to let me re-use my old fan. It arrived back in early August but I have only had the chance to get around to fit it this weekend.

The old one has come off no problems, but I am having some issues getting the new one on. Firstly, I dont see how to secure the fan to the radiator. As advised in a blatchat thread I have removed the plastic legs from the fan and am able to squeeze it in between the mounts on the radiator, but I really cant see how to secure it.

Also, there is an extra hole on the radiator with a screw thread (see pic). I assume this is meant for a temp control or something, but the old radiator did not have one and it will just be a large hole! Any suggestions on a) whats it for (to satisfy my curiosity and b) what I should use to blank it off.

[Eccles52]

Hi,
The hole is for a fan switch, as the Sigma doesn't use one you'll need a blanking plug - my Radtec came with one I think.
Ivan

[Smollet]

Mine came with a sensor in it rather than a blanking plug.

https://lh3.googleusercontent.com/-LXqayeVt_KM/TVz...

Also you'll need to have the overflow pipe fitted next to the top outlet

https://lh6.googleusercontent.com/-ZUDMOezb1EU/TVz...

For some reason the archaic upload device won't let me show pictures even though I've clicked the forum fit button

I bought my rad direct from Radtec and it came with a bigger fan already fitted

Edited by Smollet on Monday 22 September 11:30

[themanalive]

Thanks for the advice.

I had some time today to have another crack at fitting the radtec. I ordered a blanking plug which fits fine. Then I had another look at fitting the fan. I dont know what I was missing last week but it was very obvious how to do it today! For anyone searching for how to do this in the future, the answer is to drop a nut into the slot that previously housed the feet for the fan. This then acts as a captured nut into which you can screw a bolt.

Fitted everything, filled with coolant and fired her up. Only issue was that I hadn't tightened up the drain plug in the radiator so it leaked a bit. Once that was done it took a few more top ups and it was finished. New radiator looks great!