Alanb67 wrote:Yeah. Along the top seal. How would i go about repairing that particular problem. Strange one, it never leaked befote i changed the antifreeze.
Alan it does sound very strange indeed fella especially as it was fine before you changed the antifreeze. What the dickens has caused it to start leaking immediately afterwards. The thing with water leaks is they can originate from nowhere near where you think it is so just have a really close check again just in case it is a problem with the rad cap locking on proper as this problem has occurred pretty much overnight immediately after you simply just replaced the coolant ??
As you do sound pretty definite its the rad itself that is leaking rather than the cap/hoses then the only proper permanent "repair" in my opinion is to replace the rad itself with a new one ! Yep sounds a bit over the top but if your rad has cracked I personally would be concerned the rad is on its way out and could crack elsewhere.
If you want to repair it with an epoxy you will have to locate exactly where the 'crack' is and it may well be a very small one at that rather than the whole "seal" itself as you are describing . To do this wash the rad of any grime or dirt so you have a nice clean rad then start up the engine and inspect closely both the rad and surrounding components that could leak...yep the cap again !! You might even be able to see a bit of steam from a crack. If you still cannot pinpoint the crack then it might be worth buying/lending of a pressure tester to try to find the crack by checking for the sound of leaking air.
Failing to find the actual source of the leak all you can really do is use one of the many products you add to the cooling system to seal leaks like "Rad Seal" or similar but whilst this might sort a pinhole leak more permantly it may not prove to be a long term permanent repair for a crack of any worrying size methinks. In the day people popped a few egg yolks into the system which was enough to get you going for a short while but can clog up the hoses. Free range eggs were not available then
If you can actually pinpoint the crack/hole then there are many radiator epoxy's you can buy from most decent car factors. Easy to apply onto a cold clean surface but I think would still need checking every so often to make sure its holding out but this is prob the best repair you can do yourself other than leave it in to a professional repairer to sort for you but this would cost you money. An epoxy repair like this would be permanently visible especially as it is on the top as you say but if this is not going to bother you than go for it....but as said you have to find the source of the leak to do this
If it turns out the whole seal has become compromised then I would replace the rad mate !
Hope this helps and good luck. Keep us informed how you get on mate.
All the best
PS If you cannot find any crack/hole on the rad then check again the surrounding components as it really is weird this all began after a simple coolant change where hoses/clips have been disturbed !