bmw overheating

[lioosa]

i just got the cylinder head gasket done on my car and now its still losing water i've replaced the radiator ,water pump, water bottle, thermostat but the problem is still there oh and its boiling up within seconds of the engine running i got the full thing checked by 4 mechanics and no ones seems to know what the problem is and theres no blockage in any piped anywhere. Has anyone had this problem please help me thanx

[burnhal]

if its overheating that quickly then it sounds like no coolant flow. I did a quick google using 'bmw overheating quickly' . seems to be a common problem- have a google and see what the answers were- blocked hoses- thermostat (I know you have replaced yours!) blocked radiator- anything basically that obstructs water flow

[asallen]

If it's a BMW then you must keep it moving, and fast.
Tailgate other cars and push other people along. Overtake on roundabouts. Turn right from the left hand lane (and vica versa). When leaving the motorway stay in lane 3 until 50 yards before exit.
When joining motorway get in lane 3 50 yards after joining motorway.
On country roads you must overtake no less than three cars when approaching blind bend.
I have noticed all BMW drivers drive like this to keep air flowing through the radiator.
Why you also have to deal in drugs, I dont know!

[edd2blue]

might be far out here but do you need to bleed prime water pump?

[bigbus]

is your cooler fan working?

[markja]

if it's stone cold, then you start it and within a minute or two it starts to force water out of the engine then it's not going to be the cooling. ( it won't have got hot enough in that short time. )
it will be
1) cylinder head gasket leak.
2) cylinderhead cracked.(or distorted, not flat. )
3) cylinder bore cracked.

as you will have seen, these all will allow the high pressure fron the combustion chamber to escape into the relatively low presure area of the cooling system. resulting in loads of gasses bubbling up through the radiator / overflow.