Question about 2001 Volkswagen Jetta TDI

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Car problems my jetta is over heating and the ac works some times and the heater works some times and some times the light temp light flasses at me when the car is not low on water or overheating and some times the car will over heat and the light will not come on or the fans and some times the radiator fans are on and the car still over heats and the heater for the most part wont work ive changed the thermostat and the temp sensor and flushed the fluids

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Bad water pump? But with the AC not working all the time I'm not sure. Does the fan always turn on when you turn on the AC? You might want to take off a hose and make sure the T-stat is really opening up and the coolant is being pumped. Just don't burn yourself (remove hose when car off then get it hot with hose aimed at bucket, etc.). Since the AC doesn't work and thwe car overheats it points to a fan problem since thats the only way they are inter-related but some of the other things you mention don't sound like just a fan problem. For instance, the heat should be really hot if the fan isn't working. Heat not working sounds like a bad t-stat or the fluid not moving correctly. Is the t-stat in the right way and you bought the correct temperature one?

The only other thing I can think of is maybe you have the coolant migration problem. In some VWs the coolant in the reservoir gets into the wiring harness at the sensor in the reservoir and travels to all the different electronic systems and screws them up.

Posted on Sep 13, 2008

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Hi,

In my country, most overheating issues on Volkswagen models are resolved by:

  • entirely removing the thermostat (not applicable in cold regions);
  • wiring the fan to switch on once the engine is running (with or without the A/C or heater being turned on);
  • replacing the radiator thermal switch for the fan to a lower temp.
Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards. Thank you for using FixYa.

Posted on Aug 17, 2008

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SOURCE: 2004 VW Jetta 2.0 overheating.

either take out the thermostat or just replace it

Posted on Aug 03, 2011

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