Finding the leak was easy enough. Getting to the part, a little more difficult, then comes the details. That's where you shine. Making sure everything fits as it should and even securing the air box as an extra step. Nice.

Bring More Water! What an overcomplication of what should be a simple system. Well done, Will.

Excellent job, plastic parts on a BMW are always fun.

Good job to point out the final click to seat the reservoir. And point out the spring retainer clip locks only when it’s properly seated. Really important when working in hard to see places…👍

Not to be mean but to inform everyone watching this video there is a high level and low level indicator in expansion tank that should never be overlooked. Should never overfill "top off" past the high level mark. Overfilling will decrease the life of the overall system and possibly cause a failure. If your having overheating issues this could cause a catastrophe. The expansion tank needs the air gap for expansion during normal operation as the fluid will be retained there. You certainly don't want a hose to burst as you will have only seconds to pull over to shut the engine off. Robinson...please edit video warning your viewers to fill properly and possibly saving someone grief. I like your video and wish you well, thx. Oh and btw a good mechanic showed me how to use a silicone lubricant from a spray can to make those pesky orings snap into place very easy. Worth the 3 dollars to have around.

I had the same exact problem, vest part it stops leaking at a threshold where it doesn't overheat, imma get one tomorrow but 8 hours driving with that busted tank, only thing I'm losing is my heater at the moment. I'm amazed with this cars ability to keep going, no matter what's wrong with it. As though it's engineered to fail

thanks man, that was exactly where my leak was too. saved me a tone of money

Well done Elvis 😎. Thanks for another great Video. Put a little grease on the O-rings and it will make live a lot easier😉

Will thanks i leaned alot from watching u great job! Bill

Great video a lot of help, great mechanic

whats up big guy thank you for taking your time to get another great vid

Wow a BMW with a leaking coolant bottle I've never seen that before🤣🤣🤣🤣 another fantastic video mate great to watch

Thank you so much! Now I can do it myself and not trouble my hubby!

Thank you very informative and straightforward

LOL. Yeah, I saw those drops on the floor from the driver's side at the beginning of the video and thought, 'expansion tank'. So it was. This is always the first thing to suspect with coolant leaks on E46 BMWs.

Very helpful video - many thanks.

Thanks for the great video, and the pressure tester idea. hF next stop for the kit.

This video has helped me out alot cus I had problems seating my reservoir

good job Will! and using those good ole Dorman parts.

Hey Will, Astro Pneumatic 78585 is a coolant kit that I just picked up for about $200. It has the pressure testing adapters but also has a vacuum fill ability which draws air from cooling system allowing for a quick fill without running the engine to remove air pockets.

Excellent job 👍

Hell yeah thanks for the Vlog I’m having issue with my hose also now I know the problem smh 🤦‍♂️

It's a Dorman product, I'd have been shocked if it actually worked right out of the box. As soon as you said Dorman I smelled trouble. Can't say I'm too impressed with the BMW hose design. Typical engineers, take something simple and complicate it. Thanks for the video.

Good stuff man!

I learned a long time ago that you have to replace the O rings on those type hoses. Nice job anyway, Will.

such a great video!!!!!!!

Great video Will! Dependable parts are at an all-time low these days. Bet you are glad to have the lift. Take care.

You can use the plastic screw on the upper rad hose to purge air out of the system as you’re filling it.

The expansion tank does crack only leaks when hot till it fails

Aftermarket parts sure ain't what they used to be. I don't mind working on BMW's until I have to remove plastic parts. Scary. Well done Will.

I had the same problem but while I was down there I figured I might as well replace all the hoses in thermostat

Hey Robinsonsauto, I was just curious if you could share where you’ve got your pressure tester from? That’ll make my jobs a bit easier in identifying leaks, thank you and I appreciate it!

Wow! a $1.00 O-ring just turned into a $40 hose. Glad im not the owner! This is why i fix my own BMW. But good repair video

WILL, when i do any euro car use a vacuum refill tool that put the system under vacuum around 25 and watching the gage for couple of minutes that will till u we have sealed system 100% at the same time using another adapter to refill the system using the vacuum to suck the coolant in this way 100% no air bubble . good video as always cheeeeeers

Nice job. Enjoyed the video :-)

DORMAN!! When you absolutely, positively want to do it a second time!

nice job Will thanks

My E46 330i blow the Top Completely off the Plastic Expansion Bottle, I left everything in the tank and just pressed it down hard, it popped in easy enough, problem i had was at the top, getting the smaller hose all the way on so the clip could be pushed down in it's slot

Great fix, hope that Dorman part holds.

Nice and relaxed repair. Way to go, Will. Nice job! I enjoyed watching it. What can I say about Dorman? Lol. You know what Eric O would say about it, LOL!!

Hot dog first, Those short sockets look pretty handy especially in conjunction with Nano.

Good way of getting it out but I believe that was a level sensor for the coopant

BMW with a leak never seen that before ;)

Good Work learned a lot and i see a lot of tool i want lol

Thank you por video

Hey Will! I just worked on a BMW 325Ci that had like 5 oil leaks xD Must be BMW season in Pennsylvania!

What do you oil your coolant system tester with?

Good job until the green stuff showed up...European blue and bleeding screw ..!

Don’t get it twisted sometimes the visual inspection it’s not what it seems, my friend was adding coolant without a funnel so she dripped it all over the reservoir .. I thought it was the top hose ,changed it but it still leaked a lot ,took it to our European specialists ,they changed the water pump ,cost us $800 still was leaking ,they said the thermostat leaks I changed it myself, still leak , changed all hoses than it leak even parked whole gallon of distilled water came out even engine was off so I went get pressure tester (was waiting when you bring it up 😅👌🏼) and it was leaking in the middle of engine i lift the car and when i was under the car it leaked in the middle so difficult to diagnose so I did research because I changed everything even reservoir and radiator.. well it was the heater coolant hoses under the manful over $1200 at bmw it’s 2005 bmw x3 no worth it they charge my friend already $1200 for starter 🤪 so I just spent 14 h to taking the manful out all so bridle 200 k on this car 👵 😂 3other hoses broke while taking it off so tomorrow going to sears it’s just vacuum hoses and air intake that i need to buy .. the 2 hoses which leaked were broken off in the engine so no wonder it was coming all straight out ! I had to scrape the cooked hose with both O’rings out and the new hose doesn’t fit so tomorrow i sand it … I watched KZfaq videos and this apparently happens around 200 k miles it’s 💩 job a lot break become more expensive at dealership probably $2000 + better buy newer car before that 😅🚗 I got mercedes 170 k so far nothing the bmw fixing everything since I bought it … just wanted to share today’s experience and that what you don’t do your self you don’t get done right these guys saying 60 y experience better 3 of them but didn’t fix the leak I did and I’m not mechanic, did it on parking lot even rain ☔️ had to take 1h break because of that but needed to recharge lol finished at midnight with flag light 😝

Great job. But that's a really really loud engine. I've got an e46 and it would be a lie to say that it makes half the sound. (Not talking about the squeak but thr engine itself( any idea how to prevent that from happening?

You missed a bunch of things, you got to bleed the system out and Jack the car up on the driver side so it tilts to one side. You over filled the tank now there's no where for the fluid to go to and it will probably break something else. Didn't check the water inlet pipes

where did you buy the expansion tank air pump? that is a must-have :)

BMW = Burns My Wallet, lol. Good fix, but it's amusing to hear a mechanic hoping the Dorman part he bought actually works ;)

I have a 2007 335i with 154,000 miles. I just had the radiator replaced about a month ago and today I had the low coolant light come on. I was informed the radiator had a crack and that's why the coolant was leaking before I had the radiator replaced. Now I am wondering what the issue is. There doesn't seem to be any noticeable leaks.

Hey there I had my 2011 335 pressure tested by dealer- it passed but I still run out of coolant like 3 weeks driving about 30 miles a day - Wonder if I should bring it back Sounds like they didn’t open the bottom cover to inspect for leaks just pressure tested

I just took out my expansion tank and have a new one do they have orings?? 2003 E39 525i

No more coolant bleeding. Nice fix Will!

Great video but correct me if i am wrong but with any vehicle, dont it have to be running with the heater set to wide open to get it completely full and then Burp/bleed it? Just for fun............Its Raid iator not Rad iator, keep up the great videos.

What’s that noise at the end of video my car started doing that lmk thanks?!!

I'm just going to say thanks for the great tips....you lost me with the green coolant, its probably why that tank was stuck, appropriate blue coolant has lubricants for all internals in the cooling system.

Explica muy bien

It had the acronym right on the hood! Burn Me Will , even I could see that 😄

I just picked up an e46. been battling the expansion tank and hoses since. I installed a new one and everytime I get a leak fixed a new one appears when under pressure

great video

how should I know if it's too much air trapped? I just change the expansion tank that cracked due to high temperature. I want to avoid this in the future. Do you know how to prevent expansion tank failure due to high pressure?

Hey I’m interested in buying a 2009 BMW 328 i xDrive with about 48k miles, is this 3 series reliable or what problems should I expect ?

I'm having this problem on my 325CI but I changed the reservoir tank and the hoses are good but can't locate the leak, where ever it is i get not even 30 minutes out of it before the coolant light comes on and the tank is empty

Great video Will! You’re keeping everything professional as usual,unlike some others that can’t wait to tell us how bad these European vehicles are and how they hate working on them. Sorry for the trouble you had with the leaks. I would never install a Doorman part on an European vehicle unless they make a repair kit on something that fixes a part which would require a ridiculous amount of money to replace. But I do understand it’s not up to you when it comes to the parts you’ve used. I tell you it’s the tolerances when it comes to aftermarket parts. You can usually reuse those O-rings if they’re still pliable and haven’t been damaged while removing. Thanks for the video! 👍👍👍

Did you know about the e46 bleed procedure . As I don't see you doing this. Maybe if u didn't empty the whole system .

Another good informative video. Engine rebuild/replacement next? I like those, very much... ☺

will this repair stop my engine from overheating

Is a sealant that I can use which doesn't stuff things up

Everything looks good, except forget to reinstall a screw for air filter box

What if my leak is dropping underneath the passenger side towards the back? What could it be leaking from, it’s a decent amount of drip even when car is off

Jesus, I can’t get the reservoir off the last O ring. It’s killing me. It won’t release I can’t believe it. And now even more worried how I gonna get the new one back on

What if it doesn't start due to over heating and there is coolant leaking from the back side of the water pump

I have a 325ci 2003 and I have a leak somewhere I already replace the expansion tank but still no go. Anyone have ideas to where else it can be ?

Hey Will these Bmw's can be very challenging to bleed the air out of the coolant system. There are a couple of bleed screws one on the top hose and one on the expansion bottle. However overpriced hoses on these German buckets of crap. Nice video Thanks.

Hopefully it’s not the heater hose valve under the intake manifold. Good luck if it is

Ride-diator!

Slightly overfilled. You need to leave room for expansion.

how much would this cost if i went to a mechanic shop

I went ahead and purchase all new hoses radiator expansion tank save time save money and save one big headache

What pressure tester is that?

There's more plastic in modern cars than there is plastic at a Plastic Surgeon's office!

John of arc

27:19 you look like scannerdanner!

All of the BMWs that I have had, have ended up having coolant leaks... their coolant system is very weak/cheap... the plastic is cheap quality and weak and always ended up breaking...

Is this the same 325i that Ivan is working on??

Wrong coolant

What's a "Complett" Repair?

That bmw needs some tlc

The coolant should be blue not green

Green Coolant?wtf?

☆☆☆☆☆

Green coolant? jeez... You need something with Ethylene Glycol.

can somebody give me the name of the very first hose he pulled out at 2:26 ? asking for a friend lmaooo

Can someone convert those plastic parts into aluminum? I will replace them all in my BMW..

Just to say.....Why did you not hook up the pressure tester before you even took anything apart? It would have saved you a lot of time. The thermostat you are talking about ...is for the transmission oil ..its not for the engine coolant..i think you should have mentioned that. Also, you use a fluid extractor and about 5 min into the video...you are talking about the radiator drain plug.. You should have used that and you would not have the mess Anyway, your video is almost 30 min long....its about a 20 min repair

That’s not the correct coolant it takes