Passat overheating at speed

[si196904]

Hi, so my i'm on the motorway an driving at 70mph and everything is fine, but if i am doing 80mph after a while the car overheats, the car seems to be creating pressure at speed, but is fine afterwards as long as I dont do over 70mph, PLEASE HELPShift+R improves the quality of this image. Shift+A improves the quality of all images on this page.

[size12]

How's your radiator looking? Not blocked dirty or missing lots of fin's?

[kite]

Broken water pump.

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[si196904]

rad looks fine no leaks

[si196904]

would that cause loss of water and no sign of it anywhere?

[size12]

No, if your loosing water too with no signs of leaking I would be checking the head gasket water pump could also be leaking!
How much water has it lost over how long? Is there any mayonnaise under oil filler cap?

[kite]

Are you topping up the coolant on a regular basis ? Water pump vanes break up, this makes them less efficient as pumping the coolant round. This normally shows up at higher speeds as yours does. The cooling system is able to cope at lower speeds due to the rad doing its job.

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[Crasher]

Classic PD 8 valve head gasket failure symptom.