$250 Copart 91 Mercury Cougar - Blue Devil Head Gasket Repair or Fail? 

Always had a soft spot for those old cougars and thunderchickens

That Cougar is definitely worth saving for someone who's willing to put in the time and money. Body and interior are excellent, and only 127k on the car.

I've used blue devil head gasket repair and I am pleased with the results so far holding good she's not good for severely damaged head gaskets but for mine or head gaskets seems to work

Bringing that Cougar back to life for a while longer. Great content Keep us updated on this BD repair. It was smoking so bad it looked like a lost cause. I really like how your gettin this job done!

I’ve used Blue Devil head gasket sealer (the V8 one not poor and go) on a antifreeze leak through crankcase and it worked and sealed the leak! It’s good stuff

When that car was sold, the Corvette and Tbird/Cougar were the only American cars with IRS suspension in the rear.

My mom had a brand new 88 cougar 5.0 when I was 16.. it was the last year before they went to this body style. You wanna talk about a sleeper car .. love how much fun you have with these cheap cars. Sounds like pure joy

Glad to see it worked. Sometimes you have to veer away from the direction slightly to get the results you are looking for. Example: I was told never to use Barsleak to fix a small head gasket leak on a 4 cylinder Corsica I used to have.... Well I did it anyway and the leak stopped and I drove the car that way for two years. :) Not a bad looking Cougar. I kind of like the top. Look forward to future updates and can't wait to see more on the Mustang and the Corvettes.

2:27 Anyone else notice the Walmart sticker?

I removed the thermostat,, drained and flushed out my cooling system with fresh water from my garden hose and performed a regular Blue Devil flush. Then I flushed with fresh water from garden hose and performed the Concentrated Blue Devil radiator flush. Then I flushed the cooling system with fresh water from my garden hose. Then I added a bottle of Blue Devil 8 cylinder simultaneously with a bottle of Blue Devil Pour N Go as directed for both. I let my car idle for 70 minutes and let it sit for 24 hours. Previously the car had the typical exhaust going through the coolant reservoir and overheating within a few miles but zero steam out the exhaust. The car also had a slight sputter every now and then. I installed a new factory temperature thermostat, checked the fluids and added fresh water from the garden hose. My car now runs perfectly fine with zero issues. My car is a beautiful, second owner 1998 Cadillac Eldorado with the 4.6 Northstar.

I’m really glad you’re getting the lift that’s really going to make your life easier

Thought it wasnt gonna work at first but it kinda makes sense, the stuff in blue devil only hardens under extreme heat, and will only really harden where hot exhaust gasses are going into coolant so makes sense why after you let the exhaust make its way out that it finally worked! awesome!

I take thermostat out first , then add block sealer and top off with water , let idle till smoke stops , let cool , drain water , replace thermostat add coolant and drive for ever

All I can say is YES!!!I love this car! So happy you didnt give up. I wish I had it.

*Great that you tried this experiment with head gasket sealer man!* Ignore the haters Randy this car was going to the crusher for sure and you saved it from that. If somebody can get a couple of months of use out of it for very little money it would be a good deal for them. Maybe somebody that's falling in love with it is willing to take on the head gasket job if the issue appears again.

Love the channel I have had good luck with restore block sealer for headgaskets in the past that stuff really works

Ive also done the same thing with leaving the cap off. I love it when a plan comes together.

A little late to this video, but I’m really happy to see you trying to revive the Cougar. Thank you for trying with this old girl. The body and interior are in great shape, fingers crossed you continue to get the engine to turn around. 🤞 Blue devil is amazing stuff.

Missed this when it was uploaded, I'm liking all the '90s stuff coming through lately man. Might have to see if we can get a can of that Blue Devil stuff over in the UK for a car I'm working on. Engine's well and truly cooked but I unsiezed the cam & slapped it together to get it mobile & it actually runs not half bad except for the warped head causing the gasket to blow again. (longer term, it's getting a replacement engine but it'd be interesting to see if that gunk can do some magic)

The Cougar is still around. I was so glad to see it, although it is really smoking from the head gasket. Im glad to see you're trying to keep her on the road. It's a good looking car and you're seeing less and less of those two door luxosports these days. Hopefully she'll stick around for a while. From the comments I'm reading, she has some fans.

18:23 when you drive a 500$ Craigslist car back home 😂😂

I remember when my aunt and uncle bought a 92 special limited edition off the show room floor. What a beauty. They always stored it in the winter, in 2003 at 100,000 miles lost a head gasket, the 3.8 was famous for that around that mileage. I'd you have the money and interest you'd have a nice rig after she's all fixed up!

30 year old car. I’ve always liked the older cougars. Thanks Randy for not giving up. Good content

A ford 3.8 with a blown head gasket no way ...... usually when you have exhaust getting in the cooling system blue devil will not work it can't seal a hole that has exhaust gasses blowing through it

You should try the K&W head gasket repair in the green bottle. I use the nanotechnology or the fiberlock. I have sealed leaks that were spraying coolant, brought motors back from the dead, and stopped engines from eating coolant or overheating. I suggest the fiberlock for that one but the nanotechnology should work too.

Way to go Randy I'm glad you are becoming a big Utube channel you deserve it .

Did you have the heat/ defrost on at full so it circulates through the whole system faster? i found that to work also when doing this repair.

I am amazed. I did not think that Cougar was going to make it. You had it right by taking the cap off. Great call!

Worked at. Ford dealer back in the 90s, we had 3 guys that all they did was head gasket jobs on 3.8s

Another great video. I love the stubbornness that you had on not giving up on the cougar.

Those service carts are great. I have a Harbor Freight one from about 10 years ago. Don't be like me, mine just ends up collecting more and more stuff until I can't use it. Can't wait for you to get the lift, that will be a game changer for sure.

Great job Randy! The mercury deserves a second chance!! Keep up the great work!! ⭐️⭐️⭐️⭐️⭐️

Glad to see that blue devil work!! I never heard of it! Might have to get some for my daughters car!

glad you ran it without the cap off, but i've heard some mechanics suggest that you run it on an incline with the front end facing up to help bleed the excess air and gas out that might be still trapped in the system. it looks like i is already parked on an incline outside that shop door, so you may have already done that.

That Cougar is definitely worth saving

I've been using Super Clean spray cleaner in the purple bottle for years. Stuff works great.

Red Devil I put it in my car 4 years ago and I'm still driving the car and haven't had a bit of a problem

Is it ok to drain and put new coolant in after a week or so without ruining the fix? I have a small exterior head gasket leak, leaking down the block from the head gasket not in the oil yet. Thank You!

I bought a Saturn for $100 about 10 years ago. It had a cracked head and would barely run(common for those model Saturns). Blue Devil actually worked on it. I drove it for over a year and thousands of miles until the crack got too bad. But blue devil definitely allowed me to get my money's worth from that car. It was actually miraculous.

Poor cougar!! I use super clean! Thanks for the video randy!! I hope your doing well! 🤘🤘

Come a long way Randy. Can remember your old shop with the crazy landlord and flooding problems. New shop looking good!

Your doing a good job trying to save the Cougar Nice Toolbox Can't wait until Saturday I'll be watching

Thank you for trying to save the cougar. I also got one but it’s a 93 last car that my grandpa bought before he pass it will stay with me til someday I pass (I only drive it when it’s nice outside and twice a month)

I used that stuff in the past used to get from the Pharmacy back in the 70s and 80s for macking cast.

A-Team! I love that show! My dad loved that show too and he always wanted that style corvette!

Randy you're the man post anything I'm watching

Wow oh my God , I really started to get scared and sad , seeing and thinkin' that the cougar is done but look again Randy has proved the point Watch till the end and gave me the idea that Is new and insane to me personally that that with the radiator cap off it would work , yes finally , truthfully man , truthfully !!!!! yes the cougar has been saved yes , oh man , Randy now please whatever it needs , the oxygen sensors , the proper exhaust (maybe something aftermarket and cheap???!!!!) and Yes love the shop so much , awesome upgrades man yes not only the shop will not only will the corvette ( 'swamp thing' ) not be the same but the shop also . God bless you Randy , your doin' it big and awesome/excellent now . Randy please take my request , the cobra front bumper for the mustang beast and a small lip spoiler for the corvette( your wish you with bigger spoiler if you like) and for the mustang paint the spoiler black. Keep up the great work.

Hey it's Uber Man !!! Always loved your videos !!! Thanks for quality video !

Awesome video I use blue devil when needed. Don't forget you need a wash bin set up to clean parts. 👍

Randy maybe after a while you could take the heads off of the Cougar and show us the after effects of the Blue Devil. Great video thanks.

Good effort to fix the old car can't wait till Saturday I'll be watching Nice Toolbox

The first thing I thought when I first saw the first video of swamp thing was that it reminds me of the corvette from the A-team

Randy, thank you, Thank You, THANK YOU for not giving up on the old Cougar! Just a little more love, and you will be able to move her on to someone else. Great news about the lift👍 (video on installation, please) Love how the shop is coming together. And finally, please, Please, PLEASE..... send Swamp Thing to Weird Beard for body/paint‼️ It deserves it❗️

Man i love that cougar. Too bad in my country we can't have those. I would love a car like that. Keep up the good work.

Nice choice of lights for the GT. I am glad you stayed traditional.

Holy cow the blue devil worked 🤘

Vaw I love the tool box. Beautiful I need to custom build one something like that✌

Blown head gaskets on those 3.8s are common. Everyone I've ever owned has had overheating and coolant issues. Trying to combat this in the Super Coupe swap Mustang I am rebuilding. Really wish I went with something else but younger me thought it was a good idea so trying to follow through and finish a project. ARP head studs and a good set of gaskets is one way to solve it. Draining all the coolant before you dissemble is a huge piece to the puzzle. If coolant gets down in the crank case, you will likely get a rod knock shortly after changing the head gaskets. Anti-Freeze damages the bearings. Have had several that people have changed the gaskets on and then blew it up anyways because of this.

@autoauctionrebuilds can’t wait for the upcoming contact I’m really ready to see what swap thing is going to turn into

Love you channel definitely helps on some many levels

Can we get a vehicle history on swamp thing if there’s any?

One of my first cars was a 91 cougar with the 5.0 high output. Loved that car and miss it

Update? I have a Toyota avensis with blown head gasket or cracked head. No smoke from exhaust however lots of over pressure from coolant reservoir. Would definitely try blue devil if it has fixed this. Is it still going?

Have to try that Blue Devil sealant on my Jaguar maybe it'll buy me some more time before I have to change the engine. Those new lifts should really be a game-changer for you can't wait.

The cougar made Blue Devil go to church 😂😂💀 i luv ur videos bro✌🏾

To ensure it flows through a cold engine, wouldn’t it best to remove the thermostat to do this process properly?

The Mercury Cougar is cool and that addictive is pretty good and wow you took apart the red Corvette too bad I wanted to see both Corvettes restored but I am glad to see swamp thing restored.

I recently bought a 2003 Mustang with a blown head gasket with antifreeze mixing in the oil. The car only has 90k miles on the 3.8L engine. Should I just pour the BD in through the radiator or drain the oil first to get the mixture out and then ad the BD through the radiator.

Way to go Randy - love the "New Garage" videos. Keep up the great work.

I had a 1995 Thunderbird with the 4.6, it burned oil like crazy and it was slow but I still miss that car. Hope to get another MN12 someday!

Welp I think she’s done. Keep up the great work and thanks for the content stay safe and take care Edited you should put the engine and trans form the red Vette as that would make for some great content

I had a 67 chevy truck a few years ago and it had a 230 inline 6 cylinder that had a cracked head. I put some old style Bars Leak stop in it that you had to leave the engine idling for about 30 -45 minutes and let the vehicle sit for 24 hours afterwards. The next day the water leak was fixed. It kept running for over 10 years afterwards.

Very GLAD for you to get (another) LIFT. I remember the other lift you had and had to leave behind (Dodge DART) got done on that one. RANDY, that was in a rented shop and now in YOUR shop - hell yeah! Happy for you. That vette will be sweet! COUGAR - better to try then not try at all. Plus, you resurrect part of youth. Win - Win!

2021 is going to be a fun ride can't wait for more videos

Very nice setup for that Atari 800 computer! Was surprised to see that as I still use mine daily as well!

Could that blue devil head gasket additive block the heater core ?

Have you tryed k&w fiberlock head gasket sealer i.tryed it and it worked for me

Poor little Cougar! Great content as always Randy! 😎

Wow. Everyone should watch this to the end. I am sure a lot of people missed it. Great vid Randy! The devil is on the details!

had a 91 xr7 5.0 the abs brake actuator gave out, its a massive huge one and a pita!

what company did you used to build your metal building, did they pour the slap too

Was thinking about using Blue Devil on my 08 Dodge caravan. Had a V-6 with EXACT same problem. Runs much better than that T-Bird though. Will let you know how it turns out.

Randy I think the Cougar is a wonderful car. it must have been really nice brand new !

I've also had great luck with Blue Devil glad it worked for you. Did you strip the red vette?

There's only 1 way to fix head gasket leaks. Replace the head gasket lol.

That Toyota Sienna van that you made into a convertible do you still have the tailgate for it? If you do I am looking for a trim piece for mine

Can someone help answer my Q pls... my fan/heater isn't currently working, can I still use z Blue Devil?

Second time I have seen the head gasket repair in a bottle trick. First time was on Roadkill Garage. I would not have believed it until I saw it. I guess there is such a thing as head gasket repair in a bottle. I wonder how long it work for? It probably depends on how big the head gasket leak is? It would be fun experiment to drive it a while just to see how long it will work for?

I can attest, they do have a money back guarantee, they did a phenomenal job getting it back to me on a ford 4.0 ohv

I did my 4 cylinder Toyota Camry with half a bottle of Barrs seal as directed. I noticed this blue devil comes out clear and Barrs is a thick heavy resin. Do you know what chemicals are in each? The Barrs did not hold too well, I have to fill it with coolant every 3 to 5 days depending on driving type I'm doing. Would a working sealed by a can head gasket require normal amounts of coolant, much better than what I'm getting or about the same?

Would it work on oil leak coming from between the side of the engine block and cylinder head? Car has no coolant and oil mixed just oil leak coming from the side between the block and cylinder head. And also overheating or smoke issues

Time for an LS Build, 91 Mercury, good car to start with... When will we be back to the CoPart walk around videos???

Awesome video!

Video is clear and sounds good

If the motor craps out on the cougar, get up with Westin to see if he still has the ecobeast motor from the mustang. That would be really cool in the cougar, a new lease on life.

I have a head of gasket leak but it on oil side can I put that in my oil..

Good job not giving up on the cougar. It will make a good cheap A to B for somebody.

Blue Devil is supposed to be great, I have never used it. I have used the Bars Leak Head Gasket Fix a few times with awesome success.

I’m your first like 👍 I’m trying for you bro hopefully 🙏🏽 your enjoying your holidays