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  #1  
Old 03-06-2012, 11:19 AM
Junior Member
Audi TDI, VW TDI forum newbie
 
Join Date: Mar 2012
Car: Polo classic 1.9 tdi/2001
Location: copenhagen
Posts: 1
Default Polo classic overheating

Hello everyone...

I have a 2001 polo classic 1.9 tdi 90 hp. Whenever driving past 90 km/h it starts to overheat. When i drive under, there is no problems, even driving for a good amount of time. I've changed the thermostat, flushed the radiator. The coolant is clear. It needs an oil change, but that would not cause it, would it?
Only fault code was 17978.

Hope to get some help here...
Thank you very much...
René
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  #2  
Old 03-06-2012, 01:44 PM
Seatman's Avatar
Senior Member
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Join Date: Jul 2010
Car: 2000 Mk4 Golf Estate 1.9tdi 174 bhp
Location: Scotland UK
Posts: 4,294
Default

Maybe it's the water pump, they do break and can cause these sort of issues. As for the code that's for the immo but you might just be able to clear it as the car's starting fine.

http://wiki.ross-tech.com/wiki/index...8/P1570/005488

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