How to bleed coolant
 

Ok so I've had numerous coolant leaks, first from the expansion - replaced, and the oil temp sensor (was leaking first but slow). Now i've gotten my new sensor (also got the o ring by it self, but was afraid of breaking the temp sensor if just replacing the ring and not being able to move the car until i got a new sensor).

Now I want to replace the sensor and also bleed the system, but how do I do this? I don't have the battery charger? Is it necessary?

What is the year and model of your car?

2003 (aus) M54 engine

If you have the electric pump then you just need to activate via the accelerator pedal and heater on high. Id my bleeding with battery power only (my battery was under a couple months of age and i knew it was fully charged). you should be fine to do it over battery power but a battery charger is highly recommend.

You have a mechanical water pump. bavauto.com has some good instructional videos and articles.

Here is the video for doing a coolant flush.

Ok thanks for that,

What Oil temp sensor do i have? ZZ i bought it but it has the 'arms' to squeeze on the side.. I've taken off my connector but my plug doesn't have it, its just a plug and it looks like its held down by a metal wire/clamp connected to the hose... sigh.. does this part fit?