K-Seal ST5516 Heavy-Duty Multi-Purpose One Step Permanent Coolant Leak Repair, 16 oz, Pour and Go, Mixes with All Antifreeze, No Flushing Required

After reading many reviews, this product was used on several f250's like mine with similar water leaks. Mind blown that it fixed my leak in minutes when for days and many new Ford parts purchased, 20 bucks fixed it! Get it works! Oh and Ford make products old school and straight forward repair instead of tight spaces, and multiple clips and hoses!

Used it on my 2004 malibu.I used half a bottle.Works great !!! I was shocked.The Car had water squirting out of the tail pipe every time you revved the motor...like alot.I shook it up and poured have into an empty water bottle then poured it into the hose that goes to the overflow. I didn't drain the antifreeze.It worked so fast I didn't belive it...But the car only has 78,000 or so miles so it shouldn't have had any problems that soon.So maybe the hole was small.Either way I'm super happy.3 weeks later it's still going.Oh yeah. And 3 weeks ago I failed my visual inspection while getting it smogged.I'll update ones I take it back.

I bought this larger size because I wanted to use it in two different vehicles. I put the majority of it in a vehicle that I needed to add antifreeze every couple days and was blowing white smoke out the exhaust. I no longer need to add antifreeze and there’s no white smoke. The other vehicle I needed to add antifreeze maybe once a week. I added the lesser portion to this vehicle and it is not used any antifreeze since.

I bought these to use on my 2011 f350 diesel with a leak on one of the front seals behind the water pump, if I wante to fix it right I would have to take the whole front end of my truck, fan, water pump, and even the front crank cover, no way,, so I bough this mainly because the manufacturer stated that this were permanent, not temporaty fixes, so Bought it, pour just half the bottle and wow! it stoppe, I was impress, but then a cold front arrived and neded to use my heater (wich I just replaced last winter with an OEM heater core) and bam!!! mildy warm air was comming out of the vents, so.... I guess i will now have to replace the heater core wich I can do in about 5 hours (take center console out, and then dash and it literally takes less than 5 minutes to take the old heater core out and put the new one in) I guess is better that taking the front endwhat I would do different now it would be using this product and then cutting my heater core lines and splicing then togheter to bypass my heater core, let this stop leak do the magic and then flush the old coolant, put new one in and then connect back the heater lines

The stuff really works. My F350 powerstroke had a leaking water pump after 266000 miles. It was leaking like a sieve. Poured the K-Seal in, leak slowed up within a minute, totally stopped after 5. I totally impressed with this product. I never write reviews, only if the product works better than expected or if the product is junk. 5 stars for K-Seal.

It will clog your system, it did it to my semi Volvo VNL670, stay out of this thing!

Flush cycle and then back in with this product and water and then dump that water out to be able to put coolant back in it to be able to put it back in the service and a you know winter time scenario or summer to Winter scenario this stuff you just poured in and let it do its job and you're done you don't have to drain the coolant out you don't have to go through a big process of it throw it in there let her idle for a while they're back in service and go to work make some money and stuff keeps equipment and stuff operating when you don't have a chance to take it down or take it out of the field for a while and it'll get you by or it'll work as a permanent fix I wish I could get buy stocking in this stuff

The media could not be loaded. So I have a 2005 Chrysler Pacifica, with about 206,000 miles. For the last 2 years I've been fighting this leak through the intake manifold gasket, where I would have to put in about of quart of coolant every 3 days. I've been working on cars all my life so I know how hard it is to change a head gasket or even a intake manifold gasket. Throughout the two years I've been using J-B weld aluminum extreme heat which were only suppressed the leak for about 2 months at a time. After doing a little bit of research I came across this product. Started watching videos and reading testimonials. I was like what the heck let me try it. The leak would occur usually about three to five minutes after I start my car. I added a little bit more coolant, and started my car. I followed the instructions shaking the bottle for 30 seconds vigorously and proceeded to pour the whole bottle into the reservoir tank. My car was really low on coolant so when I added the k seal it went directly from the reservoir into the block. I added a little more coolant to top the reservoir tank off and and place the cap back on the reservoir. At this point my car had already been running for about 5 minutes and what do you know not a trace of coolant was leaking. Like I said before this been happening for 2 years so I know that the coolant should have been leaking by now. So I let the car run for 30 minutes. I turned on the heat full blast just so it wouldn't get clogged into the coils of the heater core. Usually about 30 minutes of running my car the coolant would have been pouring out of the gasket in between the intake manifold and the head. There was no leak at all. After close inspection the area was bone dry. I have never witnessed a product that can fit fix a gasket leak like this one. It literally save me about $1,500 in costly repairs, actually would have been less because I would have been fixing it myself ,but still save me about 5 to 8 hours of labor. So my review for this product is definitely 5 stars and it definitely worked in my situation. I will update this in about 30 days. See the video for yourself.UPDATE: As of today, (May 19th). the leak is still sealed. It's been about 45 days and the seal is still going strong!