Full coolant drain down, help needed

Ladderman · Post by **Ladderman** » Sun May 17, 2020 9:58 am

Could anyone recommend the best way to drain down as much old coolant as possible from my 3.0si engine. I know were the drain plugs are at the bottom of the rad, but this doesn't drains all the fluid. I don't think theirs a plug on the block either, so do I need to take off a hose near the pump? Any help would be much appreciated.

Jl-c · Post by **Jl-c** » Sun May 17, 2020 10:13 am

I think the official BMW way is a vacuum pump that empties the system then refills in reverse by using the tool and an air compressor. It’s a similar process to the 911. Manually I can’t help but indy’s may well have the tool?

saj77 · Post by **saj77** » Sun May 17, 2020 10:42 am

You can remove the coolant hose from the thermostat.

See here for full guide.
https://www.newtis.info/tisv2/a/en/e85- ... ve/I1qdK1F

Ladderman · Post by **Ladderman** » Sun May 17, 2020 10:42 am

Jl-c wrote: ↑Sun May 17, 2020 10:13 am I think the official BMW way is a vacuum pump that empties the system then refills in reverse by using the tool and an air compressor. It’s a similar process to the 911. Manually I can’t help but indy’s may well have the tool?

Hi. I've had a look at those systems, but I'd need an compressor too. The costs would totally out way the need. The other option would to get a local garage to do it. I know it's a quick job so I don't think the labour costs would be too high.

Ladderman · Post by **Ladderman** » Sun May 17, 2020 10:44 am

saj77 wrote: ↑Sun May 17, 2020 10:42 am You can remove the coolant hose from the thermostat.

See here for full guide.
https://www.newtis.info/tisv2/a/en/e85- ... ve/I1qdK1F

Great I'll give that a go

saj77 · Post by **saj77** » Sun May 17, 2020 10:51 am

Bit more info - I’ve just done this when replacing the stat and water pump.

7.6 litres of G48 coolant required according to BMW spec.

And the guide for electronic bleed procedure.

https://www.newtis.info/tisv2/a/en/e85- ... ve/OYeyvvP

Good luck

Ladderman · Post by **Ladderman** » Sun May 17, 2020 11:05 am

saj77 wrote: ↑Sun May 17, 2020 10:51 am Bit more info - I’ve just done this when replacing the stat and water pump.

7.6 litres of G48 coolant required according to BMW spec.

And the guide for electronic bleed procedure.

https://www.newtis.info/tisv2/a/en/e85- ... ve/OYeyvvP

Good luck

Yep I'll be using G48. Cheers

saj77 · Post by **saj77** » Sun May 17, 2020 11:07 am

I used the same but the ready mixed version.

AndyJB · Post by **AndyJB** » Sun Jul 05, 2020 12:15 am

Is there something about this coolant that makes it the best for these engines? I have just picked up my first Z4 last week and would like to do a few preventative maintance jobs. I see a lot of talk about using BMW Blue coolant, but finding it is proving difficult, hence looking for good equivelants. Thanks!

MKZ4000 · Post by **MKZ4000** » Sun Jul 05, 2020 1:21 am

Go to a main BMW dealer. It’s cheap about £11

AndyJB · Post by **AndyJB** » Sun Jul 05, 2020 5:44 pm

Thanks, will do.

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