Question about 2002 Volkswagen Jetta TDI

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My vw polo keeps overheating after 1 mile or 2 the fan dont come on in car thermostat reads hot but i felt the radiator and it was warm not hot any ideas could it be radiator or thermostat water pump thanks

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  • james_cordwe May 17, 2009

    so i need a new water pump or can i buy the plastic impeller thanks

  • james_cordwe May 17, 2009

    can i some how over ride the fan so it stays on and if so would that let me drive it 40miles as thats how far the car is from my home and need to get it home thanks

  • james_cordwe May 20, 2009

    just tested my engine thermostat opens when hot but dont close when water cools down can this be the reason the car keeps overheating thanks

  • james_cordwe May 21, 2009

    removing pump in morning to replace it if its not that then could it be the radiator thanks



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Buy a nissan my polo and my friend richards golf both have the pump problem plastic impellers typical cost cutting methods

Posted on Apr 06, 2013

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Sounds like the plastic impeller has broke on the water pump.

Posted on May 17, 2009

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  • Colin Stickland
    Colin Stickland May 20, 2009

    water pump complete ,sorry and no you cant drive it evan with the fan on and the interior heater .The water isnt circulating

  • Colin Stickland
    Colin Stickland May 21, 2009

    thermostat fine ,remove the pump and check the impeller or if your not competent to remove the pump take it to a mechanic

  • Colin Stickland
    Colin Stickland May 22, 2009

    once pump is out check the impeller ,hold drive and try to turn impeller to see if its loose on the shaft.if its ok then refit ,and we will start again



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Normal operation is that the engine starts the thermostat is closed , engine block heats up and opens water starts to circulate around the block

So to check that you need to fill the radiator with cold water run it for a few minutes check the bottom hose it should be cold

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Vw polo keeps overheating and the fan dont come on what could it be

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I take it you have the radiator full and the drive belts properly tensioned.
Here is the ordered check list;
1) Get the error codes read-out. Many chain auto part stores will loan a meter to get this for free. Call. They may be mis-leading because of other problems, but may still be useful.
2) Check the fuses
3) If the radiator fan is not running while the car is hot you may need to check the thermal switch. This switch will turn on the radiator fan. If the connection to the switch was good, you may need to replace the switch. I believe the switch is in the lower section of the radiator with wires connected to it.
4) Check the thermostat and its housing for damage. Water has to flow through it.

I believe the temperature sensor that you see displayed on the dash is located on the engine near the heater hose. if everything else checks ok you may check this for false readings.

The problem should be corrected for the temperature sensor. The engine can be in hot/cold start mode and Lambda probe would get the wrong info.

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