steam comming from the coolant bottle on a 1.6 golf.... what causes this?

[jnk99]

Steam comming from the coolant bottle on a 1.6 golf.... what causes this?

There was also a hi- pitch sound before this happened. Temp guage OK at 90

Any clues??

[Njay]

It could be due to the high temperatures

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[jnk99]

Simple as that.

OK Thanks.

[mikk]

perhaps the cap is venting from the high temperature. how much steam is coming out? did the underneath of the bonnet get sprayed with coolant?

[Lito]

Are your radiator fans working, this is a common fault on the mk4s and could possibly be making your coolent over-heat