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Hey I think it's your water pump from my experience the water pump in the Passat are made from plastic and over time can break down resulting in overheating at high engine speeds.. a new aftermarket water pump is available with improved metal parts these cost the same and I am 80% sure this will resolve your problem.
What else can I help you with?
Why is your 2004 Chevy impala overheating while idling?
Check the fan control
Why does 2003 Toyota Sienna stall when idling?
2001 sienna stall while just stop while driving. electric just cut out power, then switch can operated but idling roughling
What should you do if your car is overheating while driving?
pull over and call for help
Why does it smell like antifreeze in car when driving?
your vehicle may smell like antifreeze while driving because it is overheating
What would cause your 1994 351 engine to increase or decrease rpms intermittently while idling and driving?
air leek
Why would a car vibrate or shake sometimes while idling and whle driving 65-70mph?
Loose motor mounts.
What can be the cause while driving and when the car comes to a stop the engine revs for a few seconds and goes back to normal idling mode its a Opel Corsa classic 1400.?
It is the idling sensor on top of the intake
What makes a car squeal when sitting still and make a ringing noise when driving?
Most likely it is a belt on your car. Usually the squeeling is from a loose belt while idling and will also make noises while driving.
Why does a 1996 Ford Windstar stall out while idling or driving?
get an engine diagnostic check, a lot of different problems can contribute to your situation.
What causes a 2001 vw to shut off intermittently while idling or driving at slow speed?
check the crank shaft actuator?
Why does your heater blow cold air while idling but blows hot air while driving?
Low coolant, failed thermostat, partially plugged heater core...............
2001 Chevy cavalier no heat turns cold while driving idling its hot why?
I'd check the coolant level first, then the thermostat.
