Coolant flush on a n46 tips

[TIMMOS29]

Just going through the history of my car and i cant see any record of a coolant flush, so im going to add to the list a coolant flush.

I was wandering if any body has any how tos for the 2 litre engine? And are they really a pain to bleed?

Thanks

 

[Scooba_Steve]

And are they really a pain to bleed?

I've not done a 2.0, but if you have an air compressor then a vac filling tool is well worth the cost. I got mine for about £70, they're a bit more now.

Drain looks to be rad screws x2 (I would buy new ones just in case). 1x engine block bolt.

Important!
An activation of the electric coolant pump (ignition and/or engine on, heating controller to max. temperature) with sealing cap open will cause air to be drawn into the cooling circuit. Complete filling cannot be guaranteed.

Open cap on expansion tank.
Open vent screw (1) on heat exchanger.
Add coolant slowly until coolant emerges from vent screw, close vent screw
Fill expansion tank with coolant up to edge
Close cap on expansion tank
Set heating controller to maximum temperature. Set fan to low setting. Run engine for approx. 30 secs. and then flush through engine cooling circuit by pressing accelerator pedal three to four times (approx. 4500 to 5000 rpm)
Switch off engine
Switch off ignition
Open cap on expansion tank
Fill expansion tank with coolant up to edge
Close cap on expansion tank
Allow engine to warm up until thermostat opens.

Coolant level check:
To check coolant level, allow engine to cool down; coolant temperature must not exceed 30 °C. If ambient temperature is above 30 °C, allow engine to cool down at least to ambient temperature.
Slowly open cap on expansion tank so that residual pressure reduces gradually.
Check coolant level; if necessary, top up coolant until float (1) is level with top edge of expansion tank (2).
Close expansion tank.
Note:
The tank mark indicates the fluid level at approx. 20 °C.