Whilst I cannot comment upon the long term efficiency of this product nor define any internal effects until such time as I strip down the engine, Radweld has effectively cured a significant leak in the radiator of my Jaguar X type. The system was losing about a litre every 10 miles (16Km) but has now been watertight for approximately 100 miles since I added Radweld. The efficiency of the cooling system and the heater appears to have been unaffected. This would seem to be a cheap alternative to the onerous task of replacing the radiator or removing it to affect a material repair.
Verified purchase: Yes | Condition: New
Discovered that the car radiator had about 5 small leaks. Saw this Holt's Radweld for sale and as it was cheap I bought it, arrived two days later sorted radiator out and back driving half hour later. Can't recommend it enough. + I only used one bottle, so the other one stays in the boot, just in case I or someone else needs it.
Verified purchase: Yes | Condition: New
I've used this product in the past and it proved very effective, getting me where I needed to go. It's easy to use and not messy. I'd also recommend having a small tyre inflator pump too just to add/maintain pressure once your tyre stops leaking. Because it's cheap and convenient I've bought again just in case.
Verified purchase: Yes | Condition: New
My radiator on a 2008 Toyota D4D TR 2.2 diesel was badly leaked . I gave this product a try and seems to be working will update in due course as it’s only a few days I poured it in
Verified purchase: Yes | Condition: New
Fiat loosing water was filling radiator every 3 weeks at first then I was filling it twice a week couldn't find any obvious signs anywhere no wet patches on ground etc. Thought I would give rad weld a try before making an expensive trip to a mechanic and it worked, used it 9 days ago followed instructions on the bottle and I've still got a full radiator would DEFINITELY RECOMMEND
Verified purchase: Yes | Condition: New
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