Radweld & suchlike leak stoppers.
Posted: Fri Oct 16, 2015 10:51 am
What are the opinions on using Radweld or similar coolant leak stoppers in modern engines?
Do they work?
Do they harm other bits of the engine?
Can you get it out again if it all goes wrong?
Any differences with respect to diesel engines as opposed to petrol engine?
Background....
My daily runner (mundane) car, a 2002 Renault Grande Espace diesel 2.2dci MPV, has been highly reliable, even though I don't need to use it much, but about 9 days ago on a drive in London's rush hour, with much crawling and stopping a slow coolant leak became evident and eventually its computer dashboard flashed a temperature warning and said STOP.
On investigation under the bonnet, I found that the header tank was empty and after begging water from a nearby house I found the car had lost about 1.5 litres (3 to 4 UK pints) of coolant. There was no discernable drip under the car.
Subsequent completion of the original trip and return home (around 12 miles) was without incident, but on checking it seems it has lost another 1.5 litres.
Running it in my yard showed no sign of a drip and no discernable 'white smoke' and no froth in the engine oil; so where the coolant is going is a mystery. Being a modernish diesel with power brakes, power steering, air conditioning and elaborate cabin heating systems, under the bonnet is a maze of pipes and, as I recall, getting at the rear side of the engine is most easily done by lifting the body off the front subframe (which contains engine and front wheels etc).
No way do I want to tackle that, so finding and fixing a pesky small leak properly seems like a very expensive garage labour job. So I am contemplating the risks of using a rad leak additive instead, on the assumption that if that doesn't work, I could always then ask a garage to find the leak and to flush out the rad leak stuff while they have the engine out.
So what thoughts folks?
Do they work?
Do they harm other bits of the engine?
Can you get it out again if it all goes wrong?
Any differences with respect to diesel engines as opposed to petrol engine?
Background....
My daily runner (mundane) car, a 2002 Renault Grande Espace diesel 2.2dci MPV, has been highly reliable, even though I don't need to use it much, but about 9 days ago on a drive in London's rush hour, with much crawling and stopping a slow coolant leak became evident and eventually its computer dashboard flashed a temperature warning and said STOP.
On investigation under the bonnet, I found that the header tank was empty and after begging water from a nearby house I found the car had lost about 1.5 litres (3 to 4 UK pints) of coolant. There was no discernable drip under the car.
Subsequent completion of the original trip and return home (around 12 miles) was without incident, but on checking it seems it has lost another 1.5 litres.
Running it in my yard showed no sign of a drip and no discernable 'white smoke' and no froth in the engine oil; so where the coolant is going is a mystery. Being a modernish diesel with power brakes, power steering, air conditioning and elaborate cabin heating systems, under the bonnet is a maze of pipes and, as I recall, getting at the rear side of the engine is most easily done by lifting the body off the front subframe (which contains engine and front wheels etc).
No way do I want to tackle that, so finding and fixing a pesky small leak properly seems like a very expensive garage labour job. So I am contemplating the risks of using a rad leak additive instead, on the assumption that if that doesn't work, I could always then ask a garage to find the leak and to flush out the rad leak stuff while they have the engine out.
So what thoughts folks?