635 Csi Overheating

[NewB MW]

Ok so my 6 is drinking and drinking and drinking water....and overheating. I have put about 6 liters of water in since yesterday. I drove about 50km in traffic this morning and the temperature was good. As I pulled into my drive it stated getting hot. Popped the bonnet, no water in the resivor tank

If i run the car in the drive with a hosepipe in the tank there is no leaking. Now when i did it the tank was empty and all of sudden it stated overflowing onto the bricks.

I know there is a bleed screw but I have no idea where it is...I understand there might be a air block but where is all the water going?

I really need a step by step basic set of instructions if you have any ideas...

 

[Dippies]

sounds like airlock.

but where is the water going then if there is no leak. :fencelook:

 

[Rooi_Willie]

Burning away in the cylinders? :fencelook: I hope not!

 

[Wes]

#7 is the bleed screw (i think).

Towards the top of the water pump.

Will have to check on the car when i get home.

 

[Clownshoe]

Water pump? Check dipstick for water in oil.

When my hoses started going I didn't see much leaked water, only when the pressure was up did they leak.

 

[wikk3d88]

pressure test your cooling system?

 

[abmi0000]

Burning away in the cylinders? :fencelook: I hope not!

My thoughts too based on the volume of water.

 

[NewB MW]

ok so here is an update, went out for dinner last night and as we were walking away from the car in the underground parking a river separated me from the door. looked under the car and water was gushing out. So my guess is under pressure of driving it really flows. I think I've located the hole in a pipe between then fire wall and the engine. I have the biggest hands of any person i know so this is a challenging spot to get to....

 

[Dippies]

Glad you found the problem. That is also whats creating the airlock.

Good luck with he repairs and with your "small" hands. :thumbs:

 

[Rooi_Willie]

What a relief! Good luck with the fix!

 

[Clownshoe]

http://bigcoupe.com/phpBB2/viewtopic.php?t=16101&highlight=coolant+leak+firewall

Check out this link. Discussion on possible leaks from the firewall area.

 

[JayDrft]

Hey NewB,

I encountered the same problem on my m40 318i. only discovered the fact that there was air in the system once my head gasket popped. So lets hope that you have not popped a gasket.

Is the car running or idling irratically? If so, that supports the theory of it burning in the cylinders - but that would push positive pressure through your water system, it would end up gushing out any possible opening. This would indicate your gasket blown between your water port and combustion chamber.

If you have checked your dipstick for oil and water mixing, and it turns out clean, then your gasket has not gone between a water and oil port.

A cylinder pressure test would indicate whether or not the gasket has gone. If you find any variation in the cylinder pressures - its a sure thing, but by the sounds of it, i doubt you popped the gasket.

Loosen your bleed screw as indicated in the picture 635Wes, flood the system until the water comes out of the bleed screw hole, close up nice and tight. Run the motor and monitor water level, top up with water if needed. Also as a pointer, make sure you have at least a litre of anti-freeze in.

Hope it helps and that there is no serious damage. Keep us posted.:thumbs: