[humbertob]

Hello guys, I'm just wondering how to flush coolant from a F30 (335i) without removing any hose from the radiator, I'm thinking that a good idea to flush all the coolant from the system is to disconnect the hose that is connected to the reservoir tank, and then activate the water pump using the bleeding procedure to get out all the coolant from the system. Do you guys think is this possible ? Thanks in advance for your time to share your opinion on this wondering idea.

[Busa1]

Originally Posted by humbertob

Hello guys, I'm just wondering how to flush coolant from a F30 (335i) without removing any hose from the radiator, I'm thinking that a good idea to flush all the coolant from the system is to disconnect the hose that is connected to the reservoir tank, and then activate the water pump using the bleeding procedure to get out all the coolant from the system. Do you guys think is this possible ? Thanks in advance for your time to share your opinion on this wondering idea.

https://www.newtis.info/tisv2/a/en/f...check/IJQYEotN

[chiefneil]

BMW doesn’t recommend coolant flushing on a set schedule anymore. Test the coolant first to see what kind of shape it’s in. I just had the original coolant in my ‘14 335i tested and the shop said it looks fine.

[Billfitz]

Originally Posted by humbertob

I'm just wondering how to flush coolant from a F30 (335i) without removing any hose from the radiator.

You can't. So long as the coolant in the holding tank doesn't appear dirty, due to rust, there's no reason to flush it.

[humbertob]

Originally Posted by Busa1

https://www.newtis.info/tisv2/a/en/f...check/IJQYEotN

That's what I was looking for ! Thanks a lot !

[jparnes1]

You might want to change your coolant BEFORE you see a rusty color. Rust is a sign of acidic coolant and oxidized metal. Do you want to wait until your engine starts to degrade or change the coolant preventively?

[humbertob]

Originally Posted by jparnes1

You might want to change your coolant BEFORE you see a rusty color. Rust is a sign of acidic coolant and oxidized metal. Do you want to wait until your engine starts to degrade or change the coolant preventively?

Well the reason that I want to change the coolant on this vehicle is because is not blue, is more a transparent color but not blue, definitely is not red or any other degraded or contaminated color but I feel more safe switching to the blue bmw thing !!!! I think that I'll disconnect the hoses attached to the water pump and then refill and bleed the system. Thanks again for your help guys !!!!

[bavarianride]

Originally Posted by humbertob

Hello guys, I'm just wondering how to flush coolant from a F30 (335i) without removing any hose from the radiator, I'm thinking that a good idea to flush all the coolant from the system is to disconnect the hose that is connected to the reservoir tank, and then activate the water pump using the bleeding procedure to get out all the coolant from the system. Do you guys think is this possible ? Thanks in advance for your time to share your opinion on this wondering idea.

To OP, mine was changed in 50k miles/6 years mainly there was a special $250 brake fluid + coolant (with $50 rebate from BMWNA)@dealer. Also the coolant was tested around pH7, with the green-ish blue cue turning to clear, so the anti-corrosion additive wearing out. Dependent on your local condition, pH7 may still be good for a long while though.