Coolant flush

JACKSONPULLAR

MEMBER
2008 BMW 335
3.0L
6 CYL
TURBO
2WD
AUTOMATIC
100,000 MILES

If there is a suspected clog in the system, are there any dangers of flushing that clog out and causing other problems/damaging other parts of the system/engine?

Monday, June 14th, 2021 AT 10:36 PM

1 Reply

KASEKENNY

MECHANIC
18,907 POSTS

None at all. I would suggest flushing the entire system using a heat exchanger.

Here is a guide that will help with step by step instructions:

https://www.2carpros.com/articles/coolant-flush-and-refill-all-cars

Also, if you are concerned with a blockage then I would recommend flushing them it in sections. The radiator, engine and heater core. This way you can make sure each portion is free and clear.

Also, when you are finished and put it all back together (or before you start) check the heater core lines that go into and out of the heater core. They should be about the same temp when the engine is hot. If they are not then the heater core is blocked.

Please run through this and let us know if you have questions. Thanks