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yup 3 pin is cruise control vacuum pump.
blue one could be the heater temp sensor if you have climate control, or the evap solenoid if it is over by the coolant tank
Allright, I'll have a look into that this weekend. I have digital climate control, but heater fan isn't working. That's another thing I have to look into. When I turn the ignition on, I only get a short blip of 3-4v to the fan.
What exactly does the sensor do?
If at first you don't succeed, destroy all evidence that you tried.
It just tells the Climate ECU the coolant temperature
Maybe you have a problem with the fan speed controller. You can use one off B5 A4 or Passat I think, much easier to find
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