[Polo08816]

Originally Posted by Eschmacher

I just did a coolant refresh at 90k so I could get to my DV and replace it. All the pipes near the waterpump and thermostat seemed like they were still in great condition. Didn't feel it was necessary to replace them at all.

The PCV pipe on the intake though... was not in good condition. Cracked immediately, luckily the dealer had one in stock.

The only piece I'd recommend replacing preemptively on the coolant system is the overflow hose from the upper radiator hose to the coolant reservoir.

I just noticed you're in Sterling, VA so that's "close" to me in Frederick County, MD.

The other item that may be worth it to replace is Part #3.
https://www.realoem.com/bmw/enUS/sho...diagId=11_5169

When I removed that the fitting into the engine block was cracked.

https://www.ecstuning.com/b-ecs-part...it/004503la01/

I replaced it with this which was a metal fitting.

[Eschmacher]

Originally Posted by Polo08816

I just noticed you're in Sterling, VA so that's "close" to me in Frederick County, MD.

The other item that may be worth it to replace is Part #3.
https://www.realoem.com/bmw/enUS/sho...diagId=11_5169

When I removed that the fitting into the engine block was cracked.

https://www.ecstuning.com/b-ecs-part...it/004503la01/

I replaced it with this which was a metal fitting.

You're right, that's the one that goes in near the oil filter housing on the head, right? Luckily I had just done my ofhg so the hose is new. But yes, that's another one that breaks often.

[Polo08816]

Originally Posted by Eschmacher

You're right, that's the one that goes in near the oil filter housing on the head, right? Luckily I had just done my ofhg so the hose is new. But yes, that's another one that breaks often.

Yeah, it's right near the oil filter housing on the head. I did have to disconnect the oil cooler lines in order to access those 10mm bolts for the coolant pipe flange.

Do you track with NCC or PCA Potomac at Summit Point?

[Eschmacher]

Originally Posted by Polo08816

Yeah, it's right near the oil filter housing on the head. I did have to disconnect the oil cooler lines in order to access those 10mm bolts for the coolant pipe flange.

Do you track with NCC or PCA Potomac at Summit Point?

I'm currently doing auto-x with NCC, but looking to do an HPDE soon. Either at summit point or dominion.

[2Crazy187]

No not done yet. Mine care is from 2015

[Revoltos]

My 2013 335i reached 71k a few weeks ago so I decided it was time for a coolant system refresh.
I replaced waterpump, thermostat, headertank cap, bleed screw and O ring. I changed the mickymouse hose, the three way waterpump hose, the radiator top hose and the expansion tank return hose. I also carried out a liquid moly coolant system flush and i reverse flushed the heater matrix with distilled vinegar and copious amounts of water.
The car thanked me by giving me a post cat oxygen sensor failure! 🤣

[erickonphoenix]

Sorry to revive old threads but I just did a complete cooling system refresh on my 14 328xi at 102,000.

The old coolant from my 60k flush looked good so I opted not to replace the Radiator.

• Replaced water pump
• Thermostat
• Expansion tank
• Updated the coolant hose flange to a metal one
• Changed out all the hoses
• Swapped the front and rear diff fluids while the car was in the air

The original hoses were definitely still in good condition so I wager one could let the originals ride another 50k miles. With the Texas heat and traffic I optioned to just change them all and be done with it.

The clip and o-ring system on BMW hoses is so bullet proof as long as you're careful about the removal and install sequence you won't have any problems.

The auto coolant bleed procedure is genius and purged all the air the first pass. Topped the coolant off, ran the procedure again and it was done.

[Neue_Klasse]

Great job doing this!
Bentley guide does recommend to replace all hoses every 4 years as a preventative maintenance but it does feel a bit excessive.

How many hoses in total did you replace and where did you order them?
How long did it the whole cooling system overhaul take?

[erickonphoenix]

Originally Posted by Neue_Klasse

Great job doing this!
Bentley guide does recommend to replace all hoses every 4 years as a preventative maintenance but it does feel a bit excessive.

How many hoses in total did you replace and where did you order them?
How long did it the whole cooling system overhaul take?

8 hoses total, I ordered all the parts over the last year from FCP Euro to spread the cost out. It was around $900 in parts.

I did the refresh the day after Christmas and it took the whole day. Getting up and down to work on the top and bottom of the engine wore me out, so I did the fill the next morning along with the bleed procedure while I was fresh.

[Neue_Klasse]

That’s a lot of work but now you should have another 5-10 years without any issues!