HoltsRadweld 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

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

Works a treat, I've used a few different coolant leak products from different brands one of which I used to use that costs about 5 times the price of this product. Then when my head gasket went and my usual go to brand failed to work I thought I would try this as last resort for the sake of 8 quid. Every morning when I started my campervan there was clouds of smoke pouring from the exhaust and starting to get worse. Anyway I poured this in not really expecting anything to happen went for a drive then come back home and left the engine running with the heaters on for half hour switched the engine off then went in the house and forgot all about it. Anyway next morning went out to pop to the shop started the engine expecting a load of smoke like usual low and behold not a single bit of smoke, 3 months and counting still no sign of the usual smoke or lose of coolant I was having to top coolant level up every 4/5 days before and not a drop since using this. As a side note if your cooling system is pressuring/bubbles in the header tank you cant simply pour and go like it says on the front. It's a bit more of a faff on removing heater plugs or spark plugs 1 by 1 I didn't have this problem but if that's what you're experiencing this is what you will need to do.

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!.

Well it’s stopped a very consistent leak from my head gasket seal. Not drove the car yet to see how things go. But for now the dripping has stopped. My fingers are crossed.

Had leaking coolant from somewhere but couldn't find without dismantling the mud shield etc, tried this and it has worked to stop any further loss of coolant. Followed instructions and am very pleased, would I recommend it ? Most definitely !

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.

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.

added as instructed ... seems to have achieved goal, but early days ...