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🛠️ Seal the deal on radiator leaks before they seal your fate!
Holts LOYRW2R Radweld Cooling System Stop Leak & Radiator Repair is a 250ml automotive additive designed to quickly and effectively seal radiator leaks, ensuring optimal engine cooling. Trusted by over 1,400 users with a 4.5-star rating, this compact formula offers long-lasting protection and easy DIY application, making it an essential tool for proactive vehicle maintenance.


| Asin | B000X2CR74 |
| Best Sellers Rank | 3,121 in Automotive (See Top 100 in Automotive) 50 in Fillers, Adhesives & Sealants |
| Brand | Holts |
| Customer Reviews | 4.5 4.5 out of 5 stars (1,461) 4.5 out of 5 stars |
| Date First Available | 5 Oct. 2007 |
| Guaranteed Software Updates Until | unknown |
| Item Model Number | LOYRW2R |
| Item Weight | 259 g |
| Manufacturer | HOLTS |
| Manufacturer Part Number | RW2R |
| Model | LOYRW2R |
| Product Dimensions | 14 x 7 x 4 cm; 258.55 g |
User
Has Saved Me More Than Once
I've used Radweld on several vehicles over the years, and it's successfully fixed small coolant leaks every time I've needed it. While it's not a substitute for a proper repair when major components are damaged, it's been an excellent solution for minor leaks and has saved me a lot of time and expense.It's very simple to use—just follow the instructions and add it to the cooling system. On previous vehicles, I've seen leaks stop shortly after application, and the repairs have lasted far longer than I expected.I've always kept a bottle on hand because it's one of those products you hope you won't need, but it's great to have when a coolant leak appears unexpectedly.Based on my experience across multiple vehicles, it's a product that genuinely works and has earned a permanent place in my garage.
User
Fixes leaks
It worked well.
User
Worked a treat for a (temporary) repair
Great stuff.I had a coolant leak on a diesel Smart ForTwo , caused by deterioration of the EGR charge cooler. Coolant loss was to high to risk driving the car to my preferred specialist ... but a dose of Radweld worked an absolute treat and plugged the leak completely. A quick local test drive proved all ok, so I took the chance to drive the car and had absolutely no issues whatsoever.Now its tempting to consider this as a full fix as the car performed 100%, but clearly there's chance of the repair breaking down and a risk I couldn't take, hence the proper repair will be done, but as a "get of jail" fix, the few quid of this stuff was certainly worth a punt (worthy of 5 stars but rated at 4 only because I can't determine how permanent such a "fix" would be).
User
Great value coolant leak fix!
My mk8 ford fiesta had a slight leak from the coolant radiator.I read other reviews that said it was good so I decided to try it.As long as you follow the instuctions, it should fix small leaks in the coolant system.It worked for me.It's great value & i would recommend.
User
It works
All good
User
Quick fix
Seems to have fixed the problem,affordable solution
User
Good but research first
Worked stopped the leak but also stopped my heater working so had to flush the heater matrix out after that it was fine
User
great value
does what it says on the tin
User
Fab!
Ho saputo di questo prodotto per molti anni. Usato una volta nel nostro veicolo molto tempo fa. Funziona davvero e avete solo bisogno di fare una volta. Problema risolto. Non ha esitato a comprare di nuovo quando un problema simile si è verificato su un altro veicolo.
User
Stopped leak in Subaru.
Stopped coolant leak from cross-over pipe in Subaru Boxer engine.
User
Funciona a la perfección.
Tras leer infinidad de opiniones sobre otros productos parecidos y buscar información en foros me decidí a probar este por sus buenas críticas en USA donde la mayoría son vehículos automáticos de gran cilindrada los cuales exigen más presión en circuitos etc, el mio es un Saab 93 Turbo automático 175cv Gasolina y perdía todo el líquido del bote expansor en una semana, tras varios intentos de pedir cita sin éxito en un taller para repararlo lo antes posible decidí probar temporalmente con este producto, lo primero que se aprecia es que no tiene particulas flotando como los otros productos que he visto al estilo del nural70, el caso es que a los 20 minutos de vaciarlo en el bote expansor y dar una vuelta con el desapareció la fuga, ni rastro de ella, no se cual será el secreto ya que como digo no tiene esas partículas como otros productos que supuestamente van tapando las fugas del circuito, solo quiero usarlo como solución temporal hasta que lleguen los recambios para mí vehículo pero probablemente lo dejé más tiempo así para testar su efectividad lo mas tiempo posible,conclusión: Es una solución temporal estupendas si no te fías de los típicos productos que tienen partículas dentro, dentro de un mes comentaré de nuevo.Edito un año después a dia 4/02/2018Después de un año mi vehiculo a vuelto a perder liquido refrigerante ya que no lo reparé puesto que no perdia ni una gota y por poco mas de 5 euros me parece magnifico que aguante todo un año, he vuelto a comprarlo y lo usaré de nuevo haber si vuelve a funcionar y si no tocará pasar por el taller.
User
Einwandfrei
Ich habe bei meinem Subaru Impreza auf ca 500km immer deutlichen Kühlmittel Verlust im Ausgleichsbehälter feststellen können. Ich habe dann erstmal nach Lecks und ähnlichem geschaut aber nichts gefunden. Dann wurde mir von einem Bekannten dieses Produkt empfohlen. Ich habe nach dem einfüllen der halben Flasche gleich eine Fahrt von 60km gemacht und den Kühlwasserverlust weiter beobachtet. Ich musste dann nochmal nach ca 500km ein bisschen normales Wasser nachfüllen und danach war nach den nächsten 5000km kein Verlust mehr Sichtbar.
User
Efficace fuite radiateur
Essai sur fuite radiateur de 3mm environ en ajoutant au liquide de refroidissement et en respectant la notice.Je perdais environ 1 litre tout les 3 jours et depuis plus rien même si tout vas bien j'ai préféré en remettre dans le bocal afin de bien colmater .Aucun souci de pompe à eau ou de voiture qui chauffe après utilisation
Trustpilot
1 week ago
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