[rlesko]

Originally Posted by visionaut

It looks like there’s 3 configurations - Base, MSport and Track pkg. (with an Auto vs. 6MT variation on the Track pkg). See borrowed pic from a recent thread...

Phil, you must have Base. My ‘16 435iX GC has the Track pkg version.

Looks like LOTS of hose changes are involved…

What site is this?

[visionaut]

Originally Posted by thejeremyman9

Is one of the "aux radiator" on the track pack the oil cooler? I am confusing myself a little now, as I have Msport and coolers on both sides (no fogs), but i dont think i have track pack.

The ‘first’ additional aux radiator, that goes with the M Sport upgrade over Base sits in front of the Main radiator. (see #13 in pic). The outboard oil cooler isn’t counted here, even though it’s also show added in that M Sport version pic.

The Track pack (as well as other option combos like M Sport aero with M sport brakes) adds the ‘second’ aux radiator, the outboard one opposite the oil cooler.

[Polo08816]

Originally Posted by visionaut

The ‘first’ additional aux radiator, that goes with the M Sport upgrade over Base sits in front of the Main radiator. (see #13 in pic). The outboard oil cooler isn’t counted here, even though it’s also show added in that M Sport version pic.

The Track pack (as well as other option combos like M Sport aero with M sport brakes) adds the ‘second’ aux radiator, the outboard one opposite the oil cooler.

I replaced most of the coolant system hoses in my 2014 M Sport 335i RWD.

So the radiator that sits over the main radiator should be part of the coolant system, but if I remember correctly, it's plumbed to the liquid to liquid heat exchanger for the ZF 8HP.

[visionaut]

Originally Posted by Polo08816

So the radiator that sits over the main radiator should be part of the coolant system, but if I remember correctly, it's plumbed to the liquid to liquid heat exchanger for the ZF 8HP.

Now that I think of it, that is a trans related cooler isn’t it. Odd it’s only added with M Sport though. I thought the only add-on cooling for the trans was the little heat exchanger mounted on the side of the main radiator.

Lol, maybe now I’m confused too. Maybe they were including the remote auxiliary oil cooler in that diagram, like Jeremy thought… but why then leave out this added #13 cooler if they distinguished between AT/6MT variants..?

[AmuroRay]

Originally Posted by visionaut

The ‘first’ additional aux radiator, that goes with the M Sport upgrade over Base sits in front of the Main radiator. (see #13 in pic). The outboard oil cooler isn’t counted here, even though it’s also show added in that M Sport version pic.

The Track pack (as well as other option combos like M Sport aero with M sport brakes) adds the ‘second’ aux radiator, the outboard one opposite the oil cooler.

That's the automatic transmission cooler. My manual M235i does not have one.

[Polo08816]

Originally Posted by visionaut

Now that I think of it, that is a trans related cooler isn’t it. Odd it’s only added with M Sport though. I thought the only add-on cooling for the trans was the little heat exchanger mounted on the side of the main radiator.

Lol, maybe now I’m confused too. Maybe they were including the remote auxiliary oil cooler in that diagram, like Jeremy thought… but why then leave out this added #13 cooler if they distinguished between AT/6MT variants..?

Originally Posted by AmuroRay

That's the automatic transmission cooler. My manual M235i does not have one.

The plumbing for the cooling system and the differences between M Sport and non M Sport is not clear in the diagrams.

I had to write an entire email to CSF to explain the differences for their fitment suggestions.

[rlesko]

Originally Posted by Polo08816

I replaced most of the coolant system hoses in my 2014 M Sport 335i RWD.

So the radiator that sits over the main radiator should be part of the coolant system, but if I remember correctly, it's plumbed to the liquid to liquid heat exchanger for the ZF 8HP.

Would the trans cooler be an 'easy' retrofit, then?

[thejeremyman9]

Originally Posted by visionaut

Now that I think of it, that is a trans related cooler isn’t it. Odd it’s only added with M Sport though. I thought the only add-on cooling for the trans was the little heat exchanger mounted on the side of the main radiator.

Lol, maybe now I’m confused too. Maybe they were including the remote auxiliary oil cooler in that diagram, like Jeremy thought… but why then leave out this added #13 cooler if they distinguished between AT/6MT variants..?

Yeah i guess i need to go take a picture of the front of my car and label each "cooler" as coolant, oil, or trans. I'm pretty sure i have every one that is available.

[Polo08816]

Originally Posted by rlesko

Would the trans cooler be an 'easy' retrofit, then?

Hard to tell. It's never easy adding a whole bunch of shit to a tight fitting BMW engine bay.

Originally Posted by thejeremyman9

Yeah i guess i need to go take a picture of the front of my car and label each "cooler" as coolant, oil, or trans. I'm pretty sure i have every one that is available.

What makes newer BMW so challenging is you can't quite see everything immediately. It requires layers of reconnaissance to confirm stuff. That's why the good ole days of just standing inside the engine bay with an naturally aspirated domestic V8 are over lol.

[F32Fleet]

Originally Posted by Boostedphil698

Yeah I have a 435i. I have yet to see one up here in PA with the auxiliary radiator.

My 435i has it.

M-Sport. 2015, 9/14 build.

[F32Fleet]

Originally Posted by thejeremyman9

Is one of the "aux radiator" on the track pack the oil cooler? I am confusing myself a little now, as I have Msport and coolers on both sides (no fogs), but i dont think i have track pack.

Driver side is coolant. Passenger side is oil.
I agree the same set up and I don't have the THP but my car is a 2015.

[Boostedphil698]

I'll probably just forego adding this extra cooler. Too much work and not enough info.

[rlesko]

Originally Posted by Boostedphil698

I'll probably just forego adding this extra cooler. Too much work and not enough info.

Nooo. Take the plunge! For the sake of the forums!

[Boostedphil698]

Originally Posted by rlesko

Nooo. Take the plunge! For the sake of the forums!

Hahaha. My worry is electrical harness' that I'm not seeing. Adding such is a pain.

[visionaut]

So here’s the N55 cooling system diagram, marked up to what I now understand about the cooling system variants, particularly the remote oil cooler #2 and the auxiliary radiator #15 (after wading into it a lot deeper, ha!).

Leaving the auto trans cooling stuff out for now (which also varies with M Sport Pkg/M Brakes).

Also, going back to Phil’s original Q - I added a pic of the parallel flow auxiliary radiator hookup. Maybe it’s not that many new hoses and replacement connections to splice in..?

[Boostedphil698]

Originally Posted by visionaut

So here’s the N55 cooling system diagram, marked up to what I now understand about the cooling system variants, particularly the remote oil cooler #2 and the auxiliary radiator #15 (after wading into it a lot deeper, ha!).

Leaving the auto trans cooling stuff out for now (which also varies with M Sport Pkg/M Brakes).

Also, going back to Phil’s original Q - I added a pic of the parallel flow auxiliary radiator hookup. Maybe it’s not that many new hoses and replacement connections to splice in..?

This is really nice. I also realized I don't have the trans cooler that sits behind the kidney grills lololol. This looks like a simple add in?

[rlesko]

Originally Posted by visionaut

So here’s the N55 cooling system diagram, marked up to what I now understand about the cooling system variants, particularly the remote oil cooler #2 and the auxiliary radiator #15 (after wading into it a lot deeper, ha!).

Leaving the auto trans cooling stuff out for now (which also varies with M Sport Pkg/M Brakes).

Also, going back to Phil’s original Q - I added a pic of the parallel flow auxiliary radiator hookup. Maybe it’s not that many new hoses and replacement connections to splice in..?

This is incredible, thank you! May I ask where you're pulling all of this from?

I also realize the auxiliary engine oil cooler I have on my N55 could be because of S823 Hot-climate version, and nothing to do with the engine.

With regards the auxiliary radiator, it does look rather simple from your diagrams. I wonder what is the need for the auxiliary pump, then?

[visionaut]

Originally Posted by rlesko

This is incredible, thank you! May I ask where you're pulling all of this from?

…I wonder what is the need for the auxiliary pump, then?

Thx. Research and graphics from Realoem plus BMW tech training/N55 docs.

I have found NO ‘auxiliary pump’ cited in any of my research. Just the belt-driven water pump and the single electric pump. Maybe folks are confusing the oil-to-coolant heat exchanger (#9) with being an extra pump?

[Polo08816]

Originally Posted by rlesko

This is incredible, thank you! May I ask where you're pulling all of this from?

I also realize the auxiliary engine oil cooler I have on my N55 could be because of S823 Hot-climate version, and nothing to do with the engine.

With regards the auxiliary radiator, it does look rather simple from your diagrams. I wonder what is the need for the auxiliary pump, then?

Originally Posted by visionaut

Thx. Research and graphics from Realoem plus BMW tech training/N55 docs.

I have found NO ‘auxiliary pump’ cited in any of my research. Just the belt-driven water pump and the single electric pump. Maybe folks are confusing the oil-to-coolant heat exchanger (#9) with being an extra pump?

There definitely is an auxiliary water pump because I've put my eyes (and hands on it) when I overhauled the entire cooling system in my car.

https://www.realoem.com/bmw/enUS/sho...diagId=17_0675

It's #19.

If you removed the coolant expansion tank, it's mounted in the vicinity of the coolant thermostat behind the passenger side headlight.

[thejeremyman9]

Originally Posted by visionaut

Thx. Research and graphics from Realoem plus BMW tech training/N55 docs.

I have found NO ‘auxiliary pump’ cited in any of my research. Just the belt-driven water pump and the single electric pump. Maybe folks are confusing the oil-to-coolant heat exchanger (#9) with being an extra pump?

Based on your new diagram i have everything which is consistent with what i remember. I have a 2015, Msport, hot climate, with Mbrakes, so that would ive me every aux cooler.

AFAIK there is an aux water pump if you have the aux radiator, and i thought there were actually 2 electric water pumps and nothing belt driven.

[Polo08816]

Originally Posted by visionaut

So here’s the N55 cooling system diagram, marked up to what I now understand about the cooling system variants, particularly the remote oil cooler #2 and the auxiliary radiator #15 (after wading into it a lot deeper, ha!).

Leaving the auto trans cooling stuff out for now (which also varies with M Sport Pkg/M Brakes).

Also, going back to Phil’s original Q - I added a pic of the parallel flow auxiliary radiator hookup. Maybe it’s not that many new hoses and replacement connections to splice in..?

So some aspects of the diagrams are confusing. When you get in the engine bay while replacing these components, it won't immediately "jive" because the relative physical positioning of these components are not accurate.

(Forgive me, I'm trying to remember exactly what I did over 2 years ago when I overhauled my cooling system. I will say that the BMW parts diagrams are confusing enough that I did a parts cannon order for all the components listed in RealOEM and returned what I did not use or need for my configuration).

[Polo08816]

Originally Posted by thejeremyman9

Based on your new diagram i have everything which is consistent with what i remember. I have a 2015, Msport, hot climate, with Mbrakes, so that would ive me every aux cooler.

AFAIK there is an aux water pump if you have the aux radiator, and i thought there were actually 2 electric water pumps and nothing belt driven.

This is correct.