BMW F30 335i Auxiliary Radiator Replacement, Coolant Top Off, and Coolant System Bleed

Hey Everyone,
As noted in the video, I was driving down the road and I got a light no one wants to see... the low coolant light! So, I topped it off with a 50-50 mix of BMW coolant and distilled water, started it up and it was spraying out of my radiator like a super soaker!
Good thing it's an easy fix!
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Bryan Kiefer
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[@4js286]

Loved the video very straight forward, no distraction of filming anything useless to the topic and no chitchat!. Seriously hands down keep your videos like this one simple to follow and straight to the point thanks!

[@FlipFlopsQ]

Always have the best BMW DIY videos. Keep em coming!

[@mikeanselmo2281]

Brian, thanks for the great videos! You’ve saved me a ton of money over the years!!

[@BuffaloSoldierH]

Love these vids man thanks for documenting all this

[@chrisbraganza8481]

Awesome video as always!!! Great job!

[@tng6628]

Very good information, Thanks Brian!

[@Alikhan78611]

Hi Bryan, can you please do a video on complete coolant flush?

[@sahilsheth8000]

Agreed we need that !!!! I have a N26 car and am due for a coolant flush but don’t know the proper procedure.

[@ShumileSwift]

Great DIY, just my 2 cents here, since I've replaced the radiator on the E30 multiple times, always use the distilled water first, then check for leaks, cause man that BMW coolant is TOO expensive to risk a leak of coolant, I'd rather a leak of distilled water LOL

[@tshidingoasheng5226]

I learned the hard way :-(

[@joegoh1968]

Thanks. My coolant reservoir keeps spewing out coolant from the pressure relieve valve. Does that mean I need to bleed the system? And it cannot maintain full coolant level .. always at the low level.

[@desmonddube4167]

Great tutorial dude, question what’s the purpose of that aux rad I was going to bypass that on my F56 JCW.

[@jigga594]

Hey brian, random question. My f30 n20 has 70k miles on it. I was wondering if it is safe to do a transmission service to it? Some forums say it is not and some say its too late etc. I plan on doing flyid and filter change. Thank you for what you do for the community.

[@ericschmidt1987]

What does the aux radiator do? Does it have a main radiator like most cars?

[@dustinbay4893]

Do you have to bleed the line if you did not drain the coolant but replaced the Vent Hose??? (Part- 17-12-8-570-061) 2013 335i

[@chrisbraganza8481]

If I need to do a complete coolant flush, can I run the coolant pump without running the engine and suck out the old fluid from the overflow container as it collects in there and when complete add new 50/50 coolant to the overflow container? This would help me avoid removing the engine panel at the bottom and making a mess by taking out the coolant hose clip. Please advise. Of course I would have a battery charger connected to the battery terminals all the time during this procedure.

[@O.A_Ih4teno0bs]

What happens if i do that just for fun trying if it works i mean the 10 second throttle thing will i damage something?

[@davidb649]

Hey mate so is this procedure of battery charger on ignition 2 position+low beam lights+hot air at level 1 valid of only F30s with an electric water pump? My F30 has a mechanical water pump and I want to change the coolant. Is all I need to remove lower radiator hose, get the old coolant out,clean reservoir, then add new 50/50 mix to reservoir, then turn the engine on and get the air out on idle (as we do at old cars) instead of on ignition with a batter charger is that right?

[@ROS_75]

Hi Brian, Can you do an item about (affordable) BMW engine tuning? What are the possibilities, the pros and cons, results, etc. There are so many different story’s about engine tuning. I don’t know what to believe... Love your channel. Regards, from Amsterdam.

[@335i101]

Is this the same on the f85 (2015 X5M)? I got the low coolant light today, went to top it off and it streamed out the aux radiator. Closest dealership is 10hrs from me. This looks so simple, I just hope the X5M is the same.

[@JG-ql7ne]

I have a 2013 328i do I need to pull my radiator hose to drain my coolant or do I top it off like what u did and bleed the system

[@Weissman111]

On the B58, is the charge-cooler auxiliary radiator always below the coolant tank, and what is the auxiliary radiator on the other side of the car for?

[@chaoticend27]

Hey Kies! Do you have a F30 335i xdrive how to video of Waterpump and Thermostat replacement?

[@MrPuciek]

Hi Bryan, how to drain coolant form a bmw b58?

[@stoss-11]

Do I need to start with my coolant tank empty? I didn’t hear anything about that in the video. I’m about to do this on my 2014 335-M performance and my coolant tank is full.

[@mjnaidu9575]

Hi Bryan, can you please do a video on complete coolant flush F30, i have a 320D, they say life time coolant but would like to change it at least every 5 years or even 8, just for peace of mind, some videos show the coolant turning brown.There are no videos out there on the f30 that show how to in detail, also they say there is no coolant drain plug on radiator and a bit off work, also just want to be sure coolant is clean so vehicle can last.thank you for the videos.

[@bkboii24]

Can you drain the entire cooling system from that aux radiator point?

[@Jeffc288]

Please do a video on how to flush or replace the heater core.

[@theendangeredpetrolhead]

I have an F22 M240i, just got a low coolant notification and thankfully it seems it’s the lower auxiliary radiator. Liquid is clearly on the bumper, but my question is, would it for sure be a puncture in the radiator itself? I ask because I feel like I can also see a small hole under the car right below the radiator. Could just be the floor of the car but I’m not a mechanic

[@seraphim791]

Great video. What’s the part number of that product you have installed and will it exactly fit on my 2014 BMW 328i? Thank you brother

[@senadselimovic8649]

Hey bryan! I saw my cars coolent recently was on minimum after 5-6 months its a b48 320i. I cant see no leak and i dont know if its normal that bmw lose coolent in about one year of driving?

[@spussego]

is there an way to upgrade this radiator to a more beafy all metal radiator?

[@ericksonbyrd6681]

Can you please make a DIY for F30 N55 ac compressor replacement?

[@zackattack91000]

You don’t have to take the bottom pan off of the car to bleed the old coolant?

[@MultiLogina]

I have tow of them on my f32 n26 xi are they both the same?

[@raulmartinez3484]

Do all BMW F30 335i models have an auxiliary radiator? I tried to find mine but it doesn’t have it. Mine is a 2013 BMW 335i Sportline model. I read that only M Sport models have an auxiliary water pump so is the auxiliary radiator exclusively for M Sport models?

[@Breaker197]

Hi Brian. Old video, I know, but I've recently discovered that my passenger side auxiliary radiator on my N20 is leaking coolant. My Googling led me back to your trusty channel. Would this process be about the same on the other side? Also, is there a reason to run a 50/50 mix with coolant and distilled water as opposed to straight coolant?

[@NCF80M3]

So do you need to loosen the bleeder screw?

[@nefarious_n5544]

Hey Brian, Just had to replace my overflow hose after it snapped and did my coolant flush for me LOL. When I run the bleeding procedure, do I need to crack the bleeder valve on the overflow tank? Thanks!

[@marcofelix4388]

Has anyone figured this out

[@typejlb]

Do they make a High-Performance Auxiliary Radiator for the N55?

[@sechszylinder8055]

You don't open the coolant reservoir during bleeding process ??

[@josephfahie8147]

Can you run the car without the auxillary radiator and run a bypass hose?

[@balkarngill6628]

Really need that cv shaft video to be released.. Going to replace mine soon.

[@KiesMotorsports]

I have it filmed, I'll see if I can push it out this week for you

[@christopherpersaud8472]

Is it the same for f80 m3. Tried and nothing

[@Flamer7465]

@Kies Motorsports what do you think the 0-60 on your car is approximately? And also do you know how much horsepower and torque your car has, I would love to know, thank you.

[@borysnijinski331]

Sub 5 sec. More than 300 hp and more than 300 tq.

[@charlesanderson5376]

Ok I have a question for any bmw owner out there do you have to use bmw coolant can you use universal coolant like say Carquest brand green universal coolant

[@iTsBlue2]

For some reason I don't have this auxiliary in my f30 335i

[@JeRy1901]

Where can I get some hose clips ?

[@oscartorres3508]

What is the link to that auxiliary radiator?

[@andrewamin4142]

Great video, do I need to drain the old coolant out before I top it off ? Nothing is broken or leaking I just need to top off my coolant because it’s low.

[@yoxtanzuleta1367]

Did you ever find out the answer ? Because same

[@oneman7638]

Is this the same on an F86 X6M

[@AngelFlores-rh3ef]

Can you make a video on replacing the hoses please 🙏😭

[@sc225]

is there a drain plug on the rad. ? Some say there are none on BImmer. If that is the case flush the rad will be painful. And how often you need to flush the rad. Some say 100,000 km and some say lifefill

[@KrispyRoad]

would opening the cap while engine running is a bad idea? I thought that is the best way to remove air from coolant system is by opening the cap while engine running at normal temp

[@Dimitrius001]

That’s how we did it when I was a tech. There’s also a bleed screw on the reservoir. You can loosen that too.

[@karaboMa]

Help my F30 always wants to refill coolant

[@Mikej0h]

Thanks for your video! Why mix with distilled water? Is it better for performance or is it what BMW prescribes?

[@bigker19]

Mike van E I have the same question

[@kenlawton1531]

You always fill radiators with distilled water, It's Not just a BMW thing it's normal. Distilled water is pure with no minerals and keeps your radiator fluid going for years and helps protect your engine from corrosion. .

[@Mikej0h]

Never heard about it until now. Learning every day ;-). BMW agrees: www.newtis.info/tisv2/a/en/f30-328i-lim/repair-manuals/17-cooling/17-00-cooling-check/1HZe3We

[@FlipFlopsQ]

ALWAYS use distilled water for the radiator. Regardless of what make or model of your vehicle.

[@pr0sty]

Yes but why not just go with the 50/50 pre mix?

[@ggriffiths99]

Looks like that's a pretty convenient way to just replace your coolant when maintenance calls for it too. Would you agree?

[@KiesMotorsports]

It's not bad, it doesn't get all the coolant out though, that's the only down side. You really need to do it at the water pump to get it all

[@Ryantravisaol]

Great video. Why did you turn the headlights on?

[@ryanknoup6288]

Just FYI, I did not have to turn on my headlights to perform this procedure on my 2013 335i Msport. Only had to ignition on accessory, turn off auto hvac, heat on 84*, blower fan on lowest, hold accelerator for 10. Although the bleed process did not shut off automatically. It just kept cycling until I shut the ignition off.

[@kef103]

That was really simple . I image the stealership would charge a disgusting amount to do this . Thanks for the video .

[@jacobholloway4659]

They wanted to charge me $800+ lol

[@supremegt]

Yup they tried to charge me $875

[@TommyLGarage]

All is great but why is tour screen out???!!!

[@KiesMotorsports]

My BMW didn't come with the air vent package :(

[@MisterScalper]

You don’t need your lights on to bleed the system.

[@jarrettbarnett7656]

Does this same bleed process work when replacing the water pump and thermostat? Assume the car is cold when you’re doing this?

[@josuefuentes3681]

So that is what that thing is lol. I saw it all messed up in my beemer when i replaced the low beam on my passenger side. It looked messed up, maybe i should swap it...btw i own a 335i 2011 convertible w the n55 engine. Is a beauty but hella expensive... working on parts when i can but not much N55 tutorials out here.

[@KiesMotorsports]

Lol

[@gokukakarot68]

Yeah would like to see a complete coolant flush and bleed video if you can Bryan i think the dealer put prestone in my car and would like to see how to fully flush and bleed the lines and add the BMW coolant instead of prestone i have a F30 N29 320i x drive and would like to try and flush and bleed the coolant myself instead of paying a mechanic 400-500 dollars to do that

[@NG-gq3nv]

NOTE THIS IS FOR THE M SPORT PACKAGE

[@danielballejo3213]

Any part number or place to get the aux radiator?

[@oscartorres3508]

Trying to find the link as well

[@ericschmidt1987]

Man can you get an Alfa Romeo Giulia and do videos like these

[@keithhasafastcar]

what wheels are on your car?

[@KiesMotorsports]

These ones www.kiesmotorsports.com/collections/vmr-wheels/products/vmrwheels-v803-flow-formed-five-v-spoke-hyper-silver

[@life_of_ira]

Why did you mix distilled water if it's already 50/50?

[@Dimitrius001]

Was wondering that myself. 50/50 is already diluted with distilled water.

[@yt0500323022]

It’s not 50/50. Pause the video and look at the jug; it says Antifreeze; nothing about 50/50.

[@naradasellsvegas979]

@@yt0500323022 Owned!

[@ruufiss9922]

Welp I just ripped off those clips hopefully they go back on ok

[@marcoantonio082284]

👍👍👍👍👍👍

[@KiesMotorsports]

:)

[@stoss-11]

@kies

[@ShowMeWhatINeedToKnow]

Thanks for doing a vid on this. THESE THINGS BUST ALL ALL THE F'ING TIME!!!! Some 328i cars (perhaps all the LCIs) have the same aux radiator (but on the OTHER side of the car) -- but the problem is worse due to the bumper design -- THERE'S NO FREAKING GRILL to prevent anything short the size of a GOLF BALL from busting your radiator out (with the standard bumper)!!! Absolutely infuriating, shit design, and totally foreseeable that this is going to get hit by rocks on the freeway. It's hard to believe they released the car with such an obvious design flaw. I took the bumper off and added a grill behind the bumper -- otherwise it's just a matter of time before it happens again. Cost me something like $750 to have the dealership replace this (and I put the grille in later). Totally sucks. BMW did not do their homework here -- it is dumb as shit not to put a grille down there. This isn't a huge issue with these cars, but it is not uncommon to see people complaining about it on the forums. Obviously, if you travel the freeway, your chances of having issues goes WAY up -- compared to someone who does mostly local / city driving. I had just started doing a bunch of freeway travel about 6 months prior to mine busting out. But hey, at least I'm not upset about it, or anything, right?!?!? LOL. This left me stranded, 30 miles from home, on a *90+ degree day*, and the dealership was a good 30 mins away (in the opposite direction) as well. Took virtually the entire day waiting for a tow truck, getting the car down to the dealership, and getting back home. THANKS for lacking any sort of common sense BMW!!!

[@KiesMotorsports]

Lol. Yea, it's TERRIBLE. I'm just glad it was this one and not the one on the other side.. my oil cooler... that would have been a huge mess...

[@ryanmcgonigal8845]

I know this is old but my 2017 340ix msport's A/C stopped working. I finally tracked it to a loss of coolant in the front radiator from a pinhole, it honestly looked like a really hard insect body penetrated it. I'm guessing it only leaked when I was really getting on the car and the temps were high. 2018 models have a revised design that has a rock guard to protect the tubes and fins, so they knew about the problem. I ordered the new radiator, the revised brackets, and rock guard, $550. Keep an eye out if you get one in your shop. Not all 3 series have the same cooling system design, and AFAIK, they only implemented the rock guards for auto 340ix and 440ix cars that have msport package without msport brakes. Apparently other cars have that tiny aux radiator while the auto 340ix and 440ix have a larger aux rad the same size as the engine radiator.

[@bmergeek3353]

We have the same exact battery charger☠

[@Drtbiker88]

First!

[@tamimmiran349]

Can you do a video of adding another one for those who only have one