Holts Radweld Plus Coolant Leak Repair, Total Coolant Leak Repair, Industry Leading Car Radiator Leak Sealant, Easy To Use, Seal Engine Block, Cylinder Head, Hoses & More, Suitable For All Cars, 250ml

It seems to work wonders! I've waited a month to see if it actually holds and I have to say I am very pleased. My car developed a serious coolant leak where a metal pipe bursted and everything leaked out within minutes. After fixing this, what I thought was the only leak, the coolant kept slowly disappearing still. I bought this, hoping to avoid visit to the garage after reading the reviews and doing a little research. Extremely easy to use, just pour into the coolant tank and leave the car running for 30 minutes. Month later, coolant still at the same level!! Fantastic, easy to use and and absolute bargain too...

Outstanding result, no leak from the first use, very effective product. If you use it and still experience leakage, seek garage advice.

Had a pin hole leak in my overflow tank so thought I would give this a try before replacing it. Followed the instructions on the back ( used half the bottle ) and let the car get to temp for 30 mins. Set off to work (20 miles) and no leak! TBH even with all the good reviews I still had my suspicions, but 1month later it’s still doing brill!. Only reason for 4 stars is how well it’s works long term. Will update!.

This is amazing stuff. The inlet on the car radiator had problems. Water leaking a lot. Had it replaced, but still had the odd leak. Put the Radweld in and hey presto just like magic, the water leak was fixed. Highly recommend.

Put half of contents in my cards was loosing coolant sealed system within minutes works realy well

I purchased this hoping it would fix the leak in my Mk4 golf GTI. I followed the instructions word for word. It seemed to work, but the next morning there was a big puddle where it had drained out overnight. Did not work for me sadly.

I used two of these on my motorhome to fix a leak. Once I’d ran through the two bottles into the system then topped up again the leak is fixed. Great value for money considering a fix or diagnosis would be close to £100

I had a small leak on the bottom right hand side of my bmw was not sure if it was a hose or the radiator only leaked after the engine was cooling down not when hot research on product and similar read good and bad reviews but for the cost I went for it sealed the leak in 10/15 mins and has not come back non of the rubbish written about clogging etc it is a permanent fix and no issues with any other part of the system heating is still the same and aircon still cold a fantastic product so in my opinion it is a great buy

tenía una pequeña fuga en la junta de culata, se me pasaba pizquitas de aceite al refrigerante, un día me reventó el manguito que va al radiador, lo canvié y vi en ese momento que la junta ya se rompió del todo, porque me salía toda el agua por el tubo de escape y metiendo una presión al circuito del agua que la leche, probé este producto por probar ya que no dispongo de dinero para la reparación, lo puse y el efecto se produjo a los dos días, me sorprendí porque ya no soplaba en el bote de expansión ni burbujeaba absolutamente nada (antes de esto era un geiser), el agua se mantiene al mismo nivel desde que la puse, me funciona todo bien, radiador, termostato, calefacción, bomba, etc... tenía un poro en la junta y ya está tapado, de esto hace casi un año ya y de momento todo va bien, tendría que tener un poro pequeño y lo ha tapado, no se en otros casos, pero a mi me sirvió y como digo a día de hoy sigue todo bien, no se lo que durará, pero hasta el momento está haciendo su trabajo.

Très bonne qualité

Bei meinem Auto hatte ich ständig Kühlwasserverlust – es wurde immer wieder Kühlwasser rausgedrückt. Seit der Zugabe dieses Kühleradditivs ist das Problem komplett verschwunden. Der Kühlwasserstand bleibt nun konstant und ich hatte seitdem keinen Verlust mehr. Anwendung war einfach und das Ergebnis hat mich wirklich überzeugt. Für mich eine günstige und effektive Lösung, klare Kaufempfehlung.

Had an annoying small leak from one of the hoses around heater area. Too hard to get to on my car without pulling plenum etc. Only happens if used heater day before and would leak coolant onto ground overnight while cooling. Put this directly into radiator as my car has overflow not expansion tank meaning overflow only fills when hot and sucks coolant back when engine cools. If you have same setup then put directly into radiator. Went for 40 mins drive immediately after putting half bottle in radiator with heater on full. Problem solved. Fantastic stuff.

Franchement j'étais sceptique ++++. J'ai longuement lu les avis des acheteurs sur divers sites (français allemands anglais) j'ai donc décidé d'acheter ce bidon parce que mon liquide de refroidissement se vidait ENTIÈREMENT EN 3J. Après chaque trajets même de 15min un bon 1/3 de partis . En ayant mis 1 bidon entier et complété avec du LDR après un trajet de 1h15min rien. Ca fait 2j et le niveau n'a pas bougé !! JE RECOMMANDE CE PRODUIT