Hi, I have an 06 vrs with a slight water leak. I have checked for leaks, and I can see no visable signs of a leak. Would the radweld work, or will it cause issues later on?

if you cant see the leak and there are no visible signs then have you thought the water is going somewhere else? ie headgasket going? In my opinion radweld is useless in this situation until the correct problem is found.

The leak is probably the bottom corners of the radiator, a common issue on all VAG cars when they get to 5 -6 years old, Radweld would stop it leaking for a whilst, but it's not really a fix and forget, rather a 'get you out of trouble' solution.

I wouldn't use radweld on a modern car, gunges all the small pipes up, you're far better off to find the leak, you'll come across it eventually.

Another common place for a slow leak is the rad temperature sensor, it's on the nearside of the radiator just above the bottom hose, have a look on the top of bottom hose where it clamps on to the radiator for signs of water staining. Leaks because there is no O ring or felt washer to seal the sensor in the rad.

I remember talking to a old boy mechanic years ago and he said Radweld was sh-te, causes more problems than it solves, he preferred Bars Leaks and he said that was sh-te as well.

In all my engineering training I was tought to understand how it worked ,then see what was not happening then to look for a cure .Your problem is that you have a leak . Before running around loking for a soltion ,as said, I'suggest you find source of leak . Then you can work out how to cure it .

Cheers for fast responses. Confirmed what I suspected about radweld. Will check out radiator. Exhaust showing no signs of steam, and oil in good condition, so not thinking head gasket.

In my day it was a tin of Colmans mustard.

Used it once on my old Dturbo, nackard the heater matrix up but fixed the mild leak :/

Wouldnt use it again unless it was really really urgent

Hello everyone, I was wondering if my response would help! I once had a leak on my VRS, I tested the head gasket 1st with a combustion leak fluid! I bought this useful tool from snap on! It's like a big test tube that you put a special fluid in to. When the car is normal operating temperature, you open the water expansion tank, and you block the tank with this kind of test tube. The fluid will change colour, if the head gasket has gone. My head gasket was ok. I was happy!

A garage near me, pressurised the cooling system and found the leak, the equipment they used was very good. To cure the leak I used K SEAL, its found at euro car parts stores and Gsf.

K SEAL IS VERY GOOD AND DOES EXACTLY WHAT IT SAYS ON THE CARTON.

Hope this helps you out Darren tt

I used radweld on my old Astra which had a small hole in the radiator after someone reversed into it, the radweld did a good job and sorted the leak. But as others have advised, if possible I would try and find the source of the problem first before using it.

Doesn't radweld react with the G12, G12++ and go all gungy ?

used K seal myself as well on other cars, good stuff.......still didnt fix what turned out to be a few 2p size holes in the block of my ****reon picasshole tho lol

Get it to a garage and get it pressure tested, stop trying to fix a leak you can't find, is not the way to go??.

With winter just around the corner you want to get this fixed pronto.

Car booked into garage for Friday am. Noticed the rad leaking bottom off side.