K-Seal Anmeldelser 524

Following directions specifically used a 8 ounce bottle in a V8 ram 1500 engine. Had a small slow leak which it did not stop. Took into shop had water pump replaced and had to replace thermostat and temperature sensor as both were clogged up. Coolant system was flushed then. Immediately had trouble with clogging the coolant systems since, clogged up the new thermostat causing it to overheat and stopped putting hot air into the cab with heater, back into the shop flushed the system two more times still bringing out gunk.

Peugeot 207 1.4 hdi coolant leak from under the plastic housing (at the gearbox end of the engine). I could see the coolant leaking but couldn't actually see the leak point itself. So decided to try a bottle of K-Seal as I usually do when faced with a coolant leak on a cheap car. I followed the instructions to the letter (as I have done before). This plugged the bulk of the leak immediately. The slight weeping leak of coolant that was still evident on the following day, was sealed over the next couple of days as the car (and the K-Seal) got a few more cold/hot cycles done. Now the area is bone dry. No leak any more.
Over the last 20 or so years I have used K-Seal on at least 4 other occasions that I can recall. Once on a home made replacement metal coolant pipe, whose clamped rubber pipework constantly leaked, second on a holed radiator core, thirdly on a leaking heater matrix and lastly on an Audi A4 oil/coolant, oil cooler.

The only fix that wasn't permanent and only lasted a few days was the oil cooler. I noticed a little oil in the coolant resevoir (which could be h/g or is sometimes in the case of VAG cars, a faulty oil cooler) I got the K-Seal in before the usual catastrophic oil cooler failure...and it may have bought me a few days....but it didn't last long. IMO that was probably due to the higher oil pressure forcing oil into the coolant so the K-Seal wasn't able to properly get into the leak location and/or the fact that the oil probably stopped the K-Seal from getting a foothold/foundation from which to build a 'seal plug' at the leak site. This instance was an oil leak under pressure into the coolant system, so in all probability it was a job that K-Seal could not reasonably be expected to fix permanently, if at all.

If you can, put the K-Seal into the engine itself by syphoning some coolant out of the system and putting the K-Seal in via the top hose. At least try to empty the expansion tank/coolant resevoir and the pipe that leads from it to the engine. This way the K-Seal gets to where it needs to be quickly, rather than sitting in the resevoir doing nothing until the circulation gets going.....Then just follow the instructions on the bottle.

As for draining the cooling system afterwards in order stop any chance of clogging from happening.......I honestly wouldn't bother. The leaks that K-Seal has fixed for me have lasted years and many thousands of miles, with ZERO problems with clogged heater matrix/radiator cores. Everything worked as they did before just without the leaks. I would go as far as saying that I would be happy with having 2x bottles of K-Seal swilling around in my coolant, without giving it a second thought.

28/01/26

After nearly 2 months the fix is still good. The car is running without problems. Zero leaks. Zero coolant topups needed (75:25 antifreeze/water mix).

I bought this product a week before Christmas because my car started pressurizing coolant into the overflow bottle and getting hot due to low coolant in the radiator. I never let it boil and had to nurse the car home. I read all the instruction on how to applicate and did this as per manufacturer instructions and let the car idle for about 45min. I took the car for a short drive and found that it is still pressurizing into the overflow bottle . I returned home and let it sit and cool back down overnight and tried it again the next day. You can see the coper particles in both the radiator and overflow bottle but it obviously didn't fix. I was hoping to get through Christmas and the New Year before I may need to have the head gasket replaced. Sorry guys this didn't work for me. Joe2

Ford Fiesta 1.4 petrol was lacking power, cutting out when cold, running terrible. Then I saw the problem, the expansion bottle was blowing lots of bubbles and coolant was being forced out the expansion tank. I clamped the hose on the expansion tank, took the expansion tank off and emptied it, put it back on along with the hose, shook the bottle of K-Seal, tipped it in then topped up the expansion tank to the max mark, started the car, within a minute there was a burp and I could tell by putting my foot on the accelerator my car’s power had come back and the head gasket was fixed. No more bubbles in the expansion tank, no more coolant loss, car runs like a champ again.

I really just wanted to thank you guys for this product. We were just on a move from Washington State to Nebraska. Half way through (in Utah) our radiator started to leak, not terribly but enough to need something to fix it temporarily for us to get to our new home. It fixed the problem and we made it all the way to our new home. My pregnant girlfriend and I thank you very much for saving the car and our new life.

Haven't tried k seal yet but looking at most of the reviews they are positive I have a leak from the radiator, I have seen on other reviews that other parts of the car can get clogged like hoses,waterpumps etc
Please can you confirm this for me?

I had been having trouble with my jeep overheating. So changed thermostat. Still the same so changed water pump still the same. So done some research. So decided to try some K SEAL plus .followed the instructions then took it for a run today 3/10/25 still the same so I'm disappointed with the K seal to be honest

My 2010 Chrysler Town and Country with 330,000 miles had a stopped-up radiator which caused the engine to overheat. $1000 later driving around town with a new radiator, fresh coolant and a new thermostat. Ran about 30 minutes. All was good. Temperature stayed in the middle of the gauge. Next thing i noticed was the gauge moved to H. Shut it off and had garage that replaced radiator tow it and tell me it was now a head gasket and about $3k to fix . Vehicle not worth $3k. Sitting in driveway days later I removed enough coolant to install a whole bottle of Kseal Ultimate into the radiator. Started the van and allowed it to idle for 45 minutes in the driveway and it heated up to mid-range on the gauge. Large hoses have normal pressure. Shop said exhaust was getting in the cooling system . Gonna try tomorrow letting it idle for a while before i test drive it around the block. Looking promising Will post again or update this review after i get 100 miles on it.

This is the first part of the review :

Today 15/08/2025
I finally managed to buy k seal through Malaysia site and I had to go to get it as it does not sell in thailand .

I am looking forward to see if it works on my BMwe70 which for last 8 months had a small leak of water coolant : I add on average 300-400 ml after a long day drive next morning when it’s cold .
Did not have time to leave it at mechanic for major repair because they said the leak is very small.

Looking forward to update you tomorrow or Sunday

OMG K-Seal saved me a huge headache. My heater core was leaking in my 2005 jeep grand Cherokee. Getting to the H fast on my temperature gauge. Bought K-Seal dumped it in my coolant reservoir along with a gallon of 50/50 I lost and I literally watched my gauge go way down. Stopped all my leaks
My AC still blows snow. So didn't clog my lines or anything.

Unfortunately it didn’t work,tried head gasket repair,followed the instructions as to the bottle instructions,run to work 2 days later and ok,run to town which is 10 mile round trip got back home and top hose is solid and hot .It looks like a major head problem.

Good product. Worked on a previous car.
Recently had a garage put it in my car without warning me. Car is still working but didn't/doesn't have any warning signs of a head gasket. Garage then proceeded to forget to replace 1 lug nut per wheel after removing locking wheel-nuts. Bad garage.
Good product.

First of all. I believe in this product. I went online and read all the usage instructions. I think I have major problems with the head gasket and block after major overheating. This stuff has made it possible to at least get it running again. They don't claim to fix major problems. I followed all instructions to the letter, even advanced instructions. At least now I can run it for short distances. If it doesn't work for you, the damage is just to severe. I think that is my situation. They only claim to fix small leaks. Don't blame them if you don't do all the research.

Vw caravelle 2.5 Tdi
Was using water ( no other symptoms) applied k seal and it’s done the job has been good for a few hundred miles , gotta be honest k seal really does work. And has saved me around £1600 try it !!

Fallowed all directions. Warmed up to temp. Let pressure off, and put k seal in top reladaiotor hose. Now it is producing soap type bubbles and causing the engine to over heat again. Total waste of money and hopefully it doesn't cost me the whole engine.

My Mondeo 1.5 Ecoboost was leaking coolant and my garage concluded it was a the head gasket. I came across K seal online and having read many reviews and generally researched it it seemed worth trying. One treatment and bingo, the header tank level is not going down any more. I have done a few hundred miles now and all is still well, and I hope it will prove to be a permanent solution. I read that k seal can be left in the system, will it stay alive active if a new fault develops? If not could I add more in that situation, I would be interested to know.
This has potentially saved me a lot of money, I am keeping my fingers crossed. Thankyou k seal.

It did not seal my headgasket problem.

This did absolutely nothing for my head gasket waste of 25 bucks. The warranty is pretty much useless you want me to drive my vehicle to a mechanic with a blown head gasket so they can verify that it's leaking for $25 screw them and there's sht products

I hadn't had much luck with cars recently, my jaguar was hit and run in a car park and afterwards I had problem after problem, I bought another car which the head gasket went on the way home, a local mechanic took it to replace the engine which I'd paid for and still has it after 8 months, I bought another car to get me to work which developed brake issues, suspension issues and then started to overheat too... I had recently opened my own business so I had put all my savings into it so money for another car was an issue..... so I got car no 3 very good condition so I spent my last spare money on... it started to leak from the radiator and I was filling the water every couple of days...so I tried your product and I can safely say it worked very well and I've not had any more leak issues! I needed it to work as I couldn't afford any more garage bills or a new car.... so thank you your product saved my car and me lots of money I don't really have.

I'm sorry to say it did not work. The leak is small, I'm surprised. Can I get another bottle and try again. The leak is at the top of the radiator in the corner.