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      02-03-2020, 06:22 PM   #1
335i101
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Aux Radiator Replacement...

I took my wife's 2015 F85 for a drive today, while driving home I received a "low coolant level" warning and figured it just needed to be topped off.

Got home, started adding coolant and a stream of coolant starting shooting from the grill on the driver's side. From what I can tell this is the, "aux radiator."

I have ordered a replacement, even paid 50 bones extra for quicker shipping as this will obviously leave the car out of commission until it gets fixed. I have a few questions for the experts on the forum....

1). How do I access this radiator? Does the entire bumper need to come off? Access it from the bottom? Etc...?

2). After it is replaced, I am guessing I have to bleed the system? The last BMW I did coolant work on, I remember there was something special sequence of steps I needed to do to bleed the electric water pump....Is this still the case? Or can I just fill it up, park on an incline, and bleed it like a "normal" vehicle.

3). Any other tips you have for me?

Thanks in advance!

Jake
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      02-03-2020, 07:45 PM   #2
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Quote:
Originally Posted by 335i101 View Post
I took my wife's 2015 F85 for a drive today, while driving home I received a "low coolant level" warning and figured it just needed to be topped off.

Got home, started adding coolant and a stream of coolant starting shooting from the grill on the driver's side. From what I can tell this is the, "aux radiator."

I have ordered a replacement, even paid 50 bones extra for quicker shipping as this will obviously leave the car out of commission until it gets fixed. I have a few questions for the experts on the forum....

1). How do I access this radiator? Does the entire bumper need to come off? Access it from the bottom? Etc...?

2). After it is replaced, I am guessing I have to bleed the system? The last BMW I did coolant work on, I remember there was something special sequence of steps I needed to do to bleed the electric water pump....Is this still the case? Or can I just fill it up, park on an incline, and bleed it like a "normal" vehicle.

3). Any other tips you have for me?

Thanks in advance!

Jake
Bummer. Something must have hit it. Not sure but hopefully someone here can help. Look at the training docs in stickies and you can see the radiator exploded view.
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      02-03-2020, 08:44 PM   #3
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Quote:
Originally Posted by DgjoX6M2016 View Post
Quote:
Originally Posted by 335i101 View Post
I took my wife's 2015 F85 for a drive today, while driving home I received a "low coolant level" warning and figured it just needed to be topped off.

Got home, started adding coolant and a stream of coolant starting shooting from the grill on the driver's side. From what I can tell this is the, "aux radiator."

I have ordered a replacement, even paid 50 bones extra for quicker shipping as this will obviously leave the car out of commission until it gets fixed. I have a few questions for the experts on the forum....

1). How do I access this radiator? Does the entire bumper need to come off? Access it from the bottom? Etc...?

2). After it is replaced, I am guessing I have to bleed the system? The last BMW I did coolant work on, I remember there was something special sequence of steps I needed to do to bleed the electric water pump....Is this still the case? Or can I just fill it up, park on an incline, and bleed it like a "normal" vehicle.

3). Any other tips you have for me?

Thanks in advance!

Jake
Bummer. Something must have hit it. Not sure but hopefully someone here can help. Look at the training docs in stickies and you can see the radiator exploded view.
Got it, thanks, I will take a look there. I couldn't find anything searching the forum, replacement wise.

I found a video on YouTube for the F30 aux, I am hoping it is that easy. For that one you take out the wheel liner, disconnect the rad and snap in a new one. Fingers-crossed.
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      02-04-2020, 09:22 AM   #4
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It's called Technical Documents in the stickies. Good luck!can probably get to it from wheel well.
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      02-04-2020, 05:59 PM   #5
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Damn that sucks, definitely looks like a rock or something hit it. I would start by getting it up in the air and removing the undercarriage trays to see if you have enough access to remove it. Worst case you have to remove the front bumper. Not too sure about the bleeding process.
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      02-04-2020, 11:43 PM   #6
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I had removed the bumper to install FMIC so I think that this may required too
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      02-05-2020, 07:55 PM   #7
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I had removed the bumper to install FMIC so I think that this may required too
Don't tell me bad stuff like this...I really don't wanna pull the bumper. I should know on Saturday.
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      02-05-2020, 08:02 PM   #8
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Quote:
Originally Posted by DgjoX6M2016 View Post
It's called Technical Documents in the stickies. Good luck!can probably get to it from wheel well.
I guess I am blind, I didn't see anything in the F85 thread. I looked on the F15 thread and found general info documents...manual, fault codes, how the headlights work, etc...??

It is possible I am blind, or perhaps some items aren't shown on the mobile site...? If you have a link to the walkthrough, it would be greatly appreciated.

Even searching "aux radiator replacement" and other variations of terms, I came up empty.
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      02-06-2020, 06:38 AM   #9
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Quote:
Originally Posted by 335i101 View Post
Quote:
Originally Posted by DgjoX6M2016 View Post
It's called Technical Documents in the stickies. Good luck!can probably get to it from wheel well.
I guess I am blind, I didn't see anything in the F85 thread. I looked on the F15 thread and found general info documents...manual, fault codes, how the headlights work, etc...??

It is possible I am blind, or perhaps some items aren't shown on the mobile site...? If you have a link to the walkthrough, it would be greatly appreciated.

Even searching "aux radiator replacement" and other variations of terms, I came up empty.
Scroll to tech docs in here.
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      02-06-2020, 10:52 PM   #10
335i101
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Quote:
Originally Posted by DgjoX6M2016 View Post
Quote:
Originally Posted by 335i101 View Post
Quote:
Originally Posted by DgjoX6M2016 View Post
It's called Technical Documents in the stickies. Good luck!can probably get to it from wheel well.
I guess I am blind, I didn't see anything in the F85 thread. I looked on the F15 thread and found general info documents...manual, fault codes, how the headlights work, etc...??

It is possible I am blind, or perhaps some items aren't shown on the mobile site...? If you have a link to the walkthrough, it would be greatly appreciated.

Even searching "aux radiator replacement" and other variations of terms, I came up empty.
Scroll to tech docs in here.
Got it thanks, I was busy looking for, "technical documents."

I will get to a full-sized computer and check it out. (Not working on my iPhone, but that could very likely be due to my lack of ability

Thanks again!
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