Best Head Gasket Sealer For Headgasket Leaks




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jenruchito76: Hi , a month ago a use that sealer cause mi car had a water leak by the block and Stops the leak almost instanly , now i had one more leak by the radiator , just where the up hose goes , i replace the hose thinking that could be the problem but stills leak a little bit , my Question is can use the head gasket sealer again ? Thanks and Happy New year

burienite: Great explanation, however I have a question. I definitely have a leaking head gasket on my 2000 GMC Yukon. Having to add coolent, milky residue on the oil fill cap, occasional misfire after the vehicle has been sitting for awhile. My question is that on the GM engines, you have to drain the radiator and the block to rid the entire coolant contents. I'm assuming you're recommending that ALL of the old coolant be drained? On these motors it's a bit more difficult, because you have to remove one of the two block plugs to get all of the coolant out. Just wanted to make sure you indeed meant all had to be removed--not just the radiator contents. Thanks again for the helpful video. 

Wm Wallace: I've used it and it worked great. I had to use 2 applications . . but the 2nd treatment did permantly seal my head gasket. I drove the truck from IL to CA and all over CA . . two years later it was still fine :)

Thien Phan: I currently have a 2000 Honda Prelude (4cyl) . It is currently diagnosed with a "very small head gasket leak" according to the mechanic. Symptoms - cold start up, it has a rough idle. Spark plugs had water in it. And Compression test was off on cyl #3 & 4. The car is currently not overheating at all. There is a new radiator, upper hose, and water pump, and the electric fans are working. Should I still use this product because I'm afraid it might gunk up the new parts I recently installed, causing an overheat problem. Also how many ounces would be needed for a 4 cyl engine.?

Ashraf Ssebaggala: I have a 2004 Nissan Altima and of late the temperature was going up and when I checked the radiator, the water level was down. I added water as I tried to observe for a few days if it was leaking. I found no water on the parking sport whatsoever. I have topped up the radiator level like 3 times now but last Friday when I took it for a regular oil change, the guy at the shop opened to put the oil and he said there was water mixing with the oil (there is a scene of like melting ice cream even on the engine cap, and I can also see it with the oil deep). He said this is a head gasket that had blown. I wanna use the K& W seal as you have suggested but what do I do to the water and oil in the engine? It is too expensive on my side to open the engine up for a new gasket. In fact, when I press the accelerator pedal in the morning as I am starting the car, I can see some water coming out of the exhaust pipe. Please help. Thank you so much!!!!A

Bryan Nethery: My '03 F-150 had a recurring rough start problem. Replaced COP's multiple times, even replaced a fuel injector, then finally had a dealer tell me there was water leaking into one of the cylinders. I used a different product (Bars Leaks Head Gasket Fix) and it solved the rough start problem, but led to overheating on cold starts. I concluded the problem was exhaust gas leaking into the coolant (instead of coolant leaking out), which caused vapor locking of the coolant loop. Since the cylinder pressure is higher than the coolant pressure, I assumed there was just no way to get the leak stop into the hole in the head gasket sufficiently to hold back 140-150 psi of exhaust gas. I assumed that I was stuck with this outcome. I "solved" the overheating problem by drilling out the hole in the flange of the thermostat where trapped air is supposed to be able to get past, to let the accumulated exhaust gas purge out when starting cold. This lets the t-stat see the actual coolant temperature and open when it's supposed to. I had to experiment to find the right size and number of holes, but this has worked great all through warm weather. However, as the temperature is dropping I find that the coolant loop through the heater core is still getting vapor locked occasionally. Based on some other posts, I was wondering if you think there is any prospect of my getting the head gasket to completely stop leaking exhaust into the coolant. This problem is causing me to consider selling the truck, but it is in decent condition and I don't really want to have to do that (cannot afford the outrageous cost of a head gasket replacement). Thanks for your help...

R Lofty: My ancient '91 Ford Taurus with 145k REALLY bit it hard! We started with overheating and disappearing coolant, but never any white smoke at the tailpipe. My wife brought the car home one day with subsequent hydro-locking (open coolant leakage into cylinder), coolant water in the crankcase with the oil, and coolant water acualy running from the cylinder head down the engine!!! I had my own auto-repair shop at one time, and IMHO, this was a broken, cracked cylinder head or engine block, or both. We did as instructed here, but only got a little over 400 miles on the engine before a cold snap forced me into flushing and adding antifreeze. This treatment was the holy grail for this car, and left it running like new, with none of the aforementioned problems!! A big THANK YOU for saving me from having to replace the engine in this car, or just junking it! Richard

Cristian Lopez: My car just went dead and i check my oil and it was full of coolant could i try this to fix it or is it irreversible??

Montana Michniak: Hello, I recently purchased a used 2002 Mercedes C230 Kompressor. It is currently diagnosed with a Head Gasket leak, which is mixing oil and coolant. Before being diagnosed with the head gasket it was diagnosed with a small oil leak and I was able to take a 5 hour trip to New York there and back (Total of 10 hours driven). On the way back from NYC the car started putting up a sign of "Low Coolant." I took it to the MErcedes Dealer the next day and they diagnosed the head gasket problem. The estimate is $1,600. I am currently a 3rd year college student and have no option of paying this estimate and I am trying to find another way to fix this problem. I have read a lot about Steel Seal and other Sealants and feel like it is a hit or miss product. Would you happen to have ANY recommendations? I am in dire need of help. Thank You!

crackermoves: Hello how are you? I have a little coolant mixing with oil (not a lot).. The green coolant dribbles out with oil change and separates from the oil running into the drain pan and runs off separately as water, Not much thank goodness & Not frothy chocolate goo like in extreme cases, the engine runs perfect but will steel seal help??. I don't think I have a blown head gasket, it never over heats, all cylinders are compression tested 142-150 and spark plugs are dry.. Could it be the upper Intake gaskets instead?? Chevy Astro Vortec 4.3 v-6 Thanks much buddy ..

dshmechanic: Maybe I'm wrong, but I was always under the impression that Magna-Fluxing will only detect cracks/faults on iron (magnetic) cylinder heads and blocks, not those made from aluminum. Was I told wrong, or is what I was told true? Also, in my opinion, the easiest, most accurate, and inexpensive test for head gasket/cracked block issues has got to be the combustion leak detector method. The test kit can be bought at Autozone, and it is a professional grade re-useable tool that a mechanic or DIY'er can use a lifetime. It comes in a red blow molded carrying case, and if you do buy it at Autozone, it is labeled "Block Tester". Just bought mine last week at my local franchise and it was $25. The 8 oz. bottle of blue dye was $8.99. It's super easy to use, and best part is it is foolproof...if you're not colorblind, lol.

Harry S: Can i use this with a 2006 BMW 750li v8 engine ? i have the same problem.. rough morning start, frequent engine oil change and coolant as well. white or grey smoke when taking off on a red light after idling for a couple of minutes. Had the spark plugs changed last year. Do you recommend using this product with my car ? thanks

Stephen Ness: I have a 2005 Chevy Tahoe with the 4.8L V-8. I have recently noticed that my coolant reservoir level drops slowly over time. It does not over heat, but the level does go down and there is no visible leakage. The level in the reservoir has dropped about an inch in the last week or so. Also, there is no engine misfire, the check engine light is not on, and there is no white smoke from the engine or from the exhaust. I have, however noticed a very small hiss coming from the back passenger side of the engine after I turn it off and it slowly reduces until it stops about 45 seconds later. I think I have a small head gasket leak, but I am not really sure and I dont want to spend a ridiculous amount of money to find out. I have toyed with the idea of getting an engine block sealant but I dont want to take an entire weekend to use it just to find out that it won't help. Any ideas as to what might be causing the coolant leak and hiss from the engine?

John Steimle: Good video. I have a 1992 Honda Accord Coupe LX with 305k miles on it. A couple months ago, I noticed I had to constantly top off the coolant. My mechanic did a pressure check and found the water pump was leaking and he replaced it and pressure checked it again with no problems. Then recently, a coolant return hose ruptured, resulting in engine overheating. My mechanic found fuel and oil in the coolant (gunk on the radiator cap) and coolant coming out the exhaust. He said I had a blown head gasket. $1300 to fix. I didn't want to put that much into such an old car, so I had him just fix the hose. He said it still had coolant coming out the exhaust and that the coolant/water would quickly boil when I drive the car from cylinder heat escaping from the blown head gasket and directly heating the water, which is does. You can see fluid in the reservoir boiling. Do you think K & W Engine Block Seal would help this situation. 

Neil Militante: Hi I have 86 corolla my radiator water was brown and my water level was low....so I pressure check it...I found out my cap was bad. My planned was to flush it and put new antifreeze ...so I installed new thermostat it was sluggish...new cap and flush the radiator ..when I add a new antifreeze while running my car started to smoke white and my engine started boggin and check engine came on then I stopped the engine...then I saw a leak from my cat watery oil then I pulled my dipstick man milky oil..

Mangler Malachi: There is something I don't understand. If it is copper metal flakes that melts and clogs the hole in the gasket or engine block, what keeps the copper metal flakes from "re-melting" (if that is a word) whenever the engine temperature goes back to its normal operating range and redistributing elsewhere, like in the radiator passages and/or thermostat? Thank you.

Adolph Oliver Bush: Good video. Looking at fixing a small head gasket leak on my 95 miata, which from the factory has a bad route for coolant, leading to head warpage. it has 182k on it, runs great, but clearly losing radiator fluid slowly. If I don't install the coolant reroute kit on this engine, am I wasting my time doing the Engine Block Sealer?

john murphy: I got a gm 4.3l had a bad lower intake manifold which let all the coolant leak out . And overheat . I fixed The intake .. now I got a bad head gasket . Which I tested and it def. Is bad . Should i just take the time and buy the gasket kit and do it that way . Or does this stuff really work and I can save my self the headache . ??

Marcus Lobo: Hey, I found this video late and ended up using block sealer without draining the coolant. Will that cause the block sealer to not work?

Drew Thomas: Have a 1990 Nissan Stanza. Had a radiator leak and was going to replace it, but didn't have time before my kid had to go back home. I plastic welded the leak to get the car going back to it's home over 300 miles. The car made it fine, but a few days later it overheated badly and could not keep coolant in it for more than 10-15 minutes. Took it to mechanic and they confirmed blown head gasket. My question is with a substantial leak like this will this sealer work on a large leak of this size? 

stclemmons1969: Great explanation of what headgasket leak is. Thanks.

Lisa Walls: I have a 1991Mazda Miata convertible that has blown a head gasket. white smoke and all the other symptoms of a blown head gasket. when it happened just so happened a Mechanic stopped to offer assistance and he even gave it a once over to help solve whatever problem I was having...he said it was a head gasket also. so,......here I am, blown head gasket and am trying to figure out the best and cheapest route to go. what do you recommend? I've seen different sealant product's but am really confused. can you give a poor girl any advice? signed, all alone in MO. P.S. My name is Lisa and my dad who passed away 2 yrs ago used to help me with these kinda problem's., but I have no family left and being that I'm a blonde, middle aged woman, I just don't wanna be taken advantage of. YA kNOW...... THANK'S for any advice. I have no were else to turn but Youtube and Google. HELP ME PLEASE!!!!

Mike Case: Hi all, my wifes 2001 mazda mpv's return hose to the water pump housing broke clean off on her while driving. Luckily she shut the vehicle off when she noticed the temp gauge was high. That being said I found a new water pump assembly and replaced it refilled the reservoir and told her she should be good to go. upon checking the coolant level I found it was low and had to refill probably about a gallon every 4 days, so I said shoot sounds like the head gasket is leaking... And then I found this video on youtube and after checking out the reviews I ordered up some of the sealant on amazon. When the product arrived I followed the instructions from this video and put about 500 miles on the vehicle in the course of three weeks. The level did change after initial start-up and subsequent first drive. I refilled the resevoir and three weeks later the level was now holding full. Finally i flushed the radiator and refilled with regular antifreeze/coolant and after two weeks of checking this product and repair procedure seems to have done the trick...saved me thousands of dollars and/or getting another car all together. For around 25 bucks and less than two actual hours of repair time I'm happy as a clam! Thank you so much for this youtube trustmymechanic, You guys Rock!!!

VItimmyy: I have an 05 durango 4.7l it's been having a bit of overheating issues. The water pump blew I fixed it didn't heat up for a couple weeks then started over heating again. Changed rad cap and thermostat was good for another couple weeks. Now I've noticed I am getting low on coolant every couple weeks but there's no external leak I can see. Everyone I talk to says head gasket but I don't have any symptoms. No loss of power no steam or white smoke nothing. There was one time where some white smoke came out but that was a couple months ago hasn't happened since I was in a parking lot idling. I've came across this video witch seems good but you said make sure you have at least 2 symptoms I have none should I still try this stuff and maybe I have a very small head gasket leak? I'm tired of paying shops to say they can't find anything wrong. And I don't wanna do a head gasket myself if it's not the actual issue

Tyson Kinsley: I have taken my Subaru Outback 2001 (2.5L engine, auto tranny) to the dealer and they confirmed the infamous head gasket leak. (I also had valve cover leaks but DIY'ed that myself) my question is this...what's the difference between an Internal amd external leak? I can visibly see places where oil is coming from on the engine block and they have antifreeze mixed, but I have never had temperature issues before and I dont seem to be using any large amounts of antifreeze. Will this sealing trick help any of my leaks or is my problem something completely different? 

Dave F: K&W Block seal has always worked very well for me. IF DONE RITE, should work every time. Just as long as the engine will still start and run. Misfire or not

timothy green: I have a small coolant leak behind the water pump.I think there may be a small crack in the block. The motor is a 4.0 straight 6. It is not overheating but i keep coolant topped off. I picked up a green bottle of k&w pour and go. Do you think this will work for my application?

LearningZone: Awesome explanation dear mate. Great video. It went a little funny @0:55 Where your arm was pointing like a rooster. lol. Regards,

Vincent Nguyen: Definitely helped! thank you for a wonderful video sir

Stevez Rock \m/: THANKS FOR THE HEIP BRO SAVED ME SOME CASH TRYING IT THIS WEEEKEND! WISH ME LUCK! IVE JUST HAD A TOTAL KNEE REPLACEMENT AND BEEN STUCK 4WS NO TRANSPORTATION I WILL BE A ANSWER TO MY PRAYES IF THIS TRULY WORKS1 THANKS AGAIN!

Ernest M: After seeing this video we bought the block seal and we applied it to a vw passat 2005 with 127k miles that was loosing coolant through the combustion chamber, it sealed immediately but we waited about 500 miles, after few days the system became over pressurized and the coolant flange piece in the engine rear ruptured,well we replaced the piece, we then flushed the system and we replaced the coolant and it kept doing that same thing, should we try the block seal again? I appreciate any help.

mikeyd19841: I have a 99 vw jettea 2.8 vr6 i just bought and i got shafted and it has a bad head gasket! I noticed that the temp gauge does not move so tmrrw i am going to remove the thermostat to see if it is bad! Is the k&w better than the blue devil and will the k&w gum up my system? You said it uses copper compound to seal the crack!

Javier Najarro: Hi! Austing. Iyhe only question I have is: during those 500 miles., do you drive with the heater and defrost on?defrost on?. Thanks, Tony

Taylor Smart: found this video extremely helpful, was doing my own research and found that a few symptom of a faulty head gasket could be low/irregular idle as well as decrease in engine power and acceleration, which my car has presented me in the past week. Ive had an overheating problem consisting of an initial hole in the heater hose which was leaking. i have replaced the heater hose and eventually bypassed it altogether through the heater valve, pulled the thermostat (hot weather in CA), replaced radiator hoses and also got a brand new radiator. for a while but i did notice a wet spot under my car this morning after driving it all weekend so I'm hoping it is an external leak that i now need to locate? Or would you recommend getting a pressure test to confirm that it is the head gasket?

chandler: I have a blown head gasket in my 2002 Chevy Malibu. I tried this and so far so good. Will update you how it came out about six months down the road. Thank You. RC

mike snyder: Horror story. My 99 ranger had a miss fire in #4( 4,0). 2 heads and 2800 dollars later, I still had a miss fire in 4. Went to a different mechanic who told me it was a broken piston. He talked me into a used engine (2500 installed). ^ week later I find myself putting water in the radiator every couple of days. They are not going to repair the 2 month old engine so i'm kind of stuck. I will try this product. The truck runs fine after warm up, so i'm assuming it's a small crack. I hope it works and I will follow your instructions. Glade to see an honest mechanic share his knowledge. 5 grand!!! Not including rental cars>

Brad Webb: I have an 02 impala with the 3.4 engine. theres no white smoke and it runs fine but I can see droplets of coolant bubbling and dripping from between the rear head and block. I absolutely refuse to pay the big $$$ to have the gasket replaced simply because the car is just not worth that much. I thought about using something like JB Weld or steel putty to try to seal the small leak externally but after seeing your video im thinking this might be a better option. which option would you recommend? jb weld externally or the k&w internally? or both?

Dave F: The metal ring doesn't go around the piston. The piston rinds do. The ring on the head gasket ring is compressed between the head and the block.

Gun Rule: WHAT COLOR IS THE CAN OF K&W BLOCK SEALANT... I FOUND AN ORANGE METAL CAN... BUT I ALSO SEEN A REB / BLK METAL CAN OF K&W BLOCK SEALER

Thanh Nguyen: After the 500 miles of driving, do you drain out the engine and radiator and let it dry out for a full day? Or do you just drain it and refill it with coolant?

Joyce Ives: hello all commetsnsoun d great....wht i was wondering is what thecan look s like (the one you use) have found 3 different products one can of metallic, one Nanotech and the other nanotech with fibers (horrible review on the fiber one).

Freeman Littlerood: The K&W Head Gasket Repair with "Nanotechnology" has worked to stop my head gasket leak in my old Toyota Previa van. A head gasket leak functionally "totaled" the van which was not worth a lot, so I figured it was worth the risk. Do not know what all it may have clogged up in the cooling system, but bottom line it worked. If my van was worth $10k or something I would not have tried it, but this will extend the life of my van and keep it working for a while I hope. It cost $20 at Walmart. I first tried K & W's older version in the orange can (for $9 at Autozone), this appeared to be working but my van overheated a little and it sprung a smaller leak. But now the larger green bottle with micro particles seems to have done the job. For you purists who insist on a proper head gasket replacement, please forgive us poor mongrel slobs who can only afford to pay $20 on a $1000 vehicle rather than $500-$3000 to a mechanic. I know this cuts into the mechanic's livelihood, and I feel for him, but.... For some of us it's either this stuff, or just buy another car of equal value (also near the end of its life in some capacity). By the way, I blended the advice of the "trustmymechanic.com" video-- Best Head Gasket Sealer For Headgasket Leaks (using the orange K & W can) with the actual instructions on the K & W green bottle (which I believe is the same as those on the orange can). Essentially, he recommends not draining the stopleak fluid after 30 minutes, but rather leaving it in for 500 miles so the metal flakes can melt and adhere to the head gasket area and anywhere else there may be leaks. I drove my van for as much of the 500 miles as I could that he recommends (winter was approaching, so I drained it at about 300 miles). I let it dry empty for over 12 hours (as instructed by the green bottle). Then put the 50/50 antifreeze mixture back it. All appears well. No leaks. No reduction in my van's performance. The van lives for another season--no doubt a little crippled, but functioning. Those made of money, please skip these steps and buy a brand new luxury car. Or if you are sleeping with a mechanic, maybe he'll give you a head gasket job for $100. These are pretty much your choices. 

curtis glass: You do have to drive it 500 miles before L in the engine coolant settle overnight right 

Lake Nokomis: First, thank you for what you are doing in sharing your knowledge. I just bought a 32oz container of K&W nanotechnology sealer. It says in the instructions that this is good for a 24 qt. cooling system. My Subaru outback holds 6.3 qts. Would you be comfortable in using just 1/4 to 1/3 of the product on this car? I can sure find good use for the rest of the sealer, and I don't want to overkill.

Denharrio Wilson: I have a 2001 Bonneville 3800 enigne.And maybe 10-15 miles in my route my car start to overheat and white smoke from under the hood, sometimes I smell a bypass of oil from the vent. help me. 

Neil Militante: After I changed a new radiator, should I changed my oil too ..Before the sealer?

mupvh: Hey Austin. This is Paul. Just wanted to stop by and thank you so much for saving me about $1,500 on my head gasket repair. I did EXACTLY what you said and it worked beautifully. No more misfiring or white smoke coming out of the exhaust. I'm at the 500 mile mark now and about to drain and flush the product(block sealer). However, my question to you is: Since I live in South Florida and cold days are very very rare here, after draining the product, can I just go ahead and fill it up with distilled water or should I still use 50/50 coolant and why? Please help me learn. Thanks again for all your help buddy. I'll be waiting on your reply. 

steve oshaughnessy: just for future refrence you can't magnaflux an aluminum cylinder head since a magnet will not stick to aluminum it must be pressure checked

Junk Filter: I have an oil leak I think is coming from the timing cover. Do you recommend a sealer for this type of leak? I believe it is the timing cover and not the head gasket because I am not losing any coolant at all.

Javier Najarro: Thank you very much for your pront reply! 
Rating:
Best Head Gasket Sealer For Headgasket Leaks 4.6 out of 5

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Best Head Gasket Sealer For Headgasket Leaks