LIDS

I just had problem with my cooling system on my GT3! I have spoken to many people and red alot on the internet so I almost feel like an expert:)

In my case it was a crack inte the coolant resorvair. I replaced it with help from Lorens thread in DIY. Thanks!

So my suggestion is to follow Lorens advice, bleed the system properly!

Good luck

It could be many things, and should probably be checked out by a mechanic since any local overheating can cause metal or gasket damage. Something you said caught my eye, though. You said that the "security pin" had popped up. Might you be referring to the domed plastic device on top of the coolant reservoir near the filler cap? It has a wire bail/handle on the top in sort of a rectangular shape. It is normally roughly horizontal. If you lever it up to vertical, it lifts a plastic pin through the top of the dome. The purpose of that assembly is to vent excess air out of the cooling system, usually after a drain/refill cycle. The 996/997 cooling system is virtualy horizontal, front to rear, allowing lot of places for air pockets to form. Air pockets may equal uncooled places and uneven cooling or localized overheating. So, it's important to be able to vent excess air and can done with the motor running/hot. Anyway, the normal position for the wire bail is horizontal. In vertical/vent mode, it may even allow hot coolant to escape....and, maybe cause steam clouds as the coolant hits hot things.

Yes its that "plasticpin" I mean.

So do you mean that its normal that the plastic pin is "pushed up" eventhough wirebail is horizontal? This happends when the engine is at a normal temp.

Thanks alot for your help :clapping:

Head gasket maybe?

I hope not:(

The cooling system will be under pressure after a drive. Did you happen to notice the reading on the temp gauge?

The temp gauge were at a normal level.

The overpressure made that "secureity pin" to pop upp and it came out water from the lid

Ok, I am going to try to explain my problem in english...

Today I took out my car for the first run after the "winter rest" Its a 996 GT3 Mk1. After a couple of hours of driving when I stopped by my friend och saw a pretty big cloud from the rear.

It was water from the cooling system. My friend who is a pretty godd mechanic told me that I have "overpressure" in the cooling system.

Anyone know what my problem is or have experienced anything simular?

Thanks guys