Bleeding the system

[944cabby]

I seem to be topping up the coolant in the reservoir in my 944s2 fairly regularly (every couple of weeks or so) - i've filled a fifth of a litre in today which has taken it to the "max" level.The car runs ok - no overheating, visible leaks etc and i really don't think the head gaskets on the way out - no oil in water or visa versa - she smokes a little white on start-up (condensation as she's not every day) but soon it clears.
I have changed the radiator earlier on this year and have just fitted a new expansion tank cap today (the old one looked worn and had cracking around the rubber seal).
I have a very strong feeling i may have an airlock and that i haven't bled it correctly - has anyone got a pic of where the bleed screw is on an S2?
When she's fully warmed up the coolant in the expansion chamber goes past the "max" level nearly up to the filler neck so i have a feeling some of the coolant is being forced out the breather pipe whilst i'm driving.
Is it normal for the coolant to fill the expansion chamber when warm or stay at the max level.It's never dropped desperately low and it's always about the same amount i have to top up.
Any advice would be much appreciated.Thanks.

[Lawrence Coppari]

You may have some air in the system. If your coolant level is getting above the maximum mark on the reservoir when hot, the vapor pressure is probably opening your pressure cap so it can relieve itself. When the level gets that high, there is not sufficient vapor space to account for the thermal expansion of the liquid coolant. Hence, the pressure is being relieved by the cap.

One way to check on whether you are relieving is to attach a balloon to the end of your relief tube. Tape it on the end of the tube. Drive car. See what is captured in the balloon.

Don't know where bleed screw is on an S2. Someone else on this list will know.

[Porsche944]

The cooling system is OVER FILLED. The proper level is between the MIN and MAX marks on the expansion tank when the engine is HOT.

[944cabby]

Thanks chaps - i've bled it today, all seems ok so far on that front.
Problem i've got now is a small oil leak towards the front left-hand side of the engine bay as you stand in front of it.
The leak looks like its coming from the bottom of hose "c" in the picture and leaks onto the plastic tray underneath straight onto the ground.

I've run my fingers all around the oil filter area and although it's very dirty it doesn't looks like it's leaking oil from there as the leak is really clean oil and not contaminated with dirt etc.I can't feel any leaks at the top of the hoses either to indicate it's travelling down from the oil filter, oil pump/cam area etc.
Can anyone possibly tell me what the three hoses are (a,b &c in the pic) so that i can order them and replace the lot, (i think the top one's power steering).

In this second pic you can see the clean oil puddle underneath the bottom hose.
Many thanks for the help.

[944cabby]

Anyone any ideas which one carries any oil a,b or c and what the part numbers would be?Many thanks