My polo is in the garage relating to the same thing. Revving itself and eventually overheating. Solution 1 was to replace the temperature gauge/sensor - this didn't work. Solution 2: was to replace the water pump. This isn't the problem, it's in good working order. Final solution is that there is a cylinder leak and a new head gasket is needed. It's having a cylinder test later which will pinpoint where it's losing water and causing the engine to overheat.
The overheating is the end result of whatever is causing your overrevving and it could very well be either the engine temp sensor or the water pump but in my case it's neither.
Posted Sep 16, 2009 (15 years ago)
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