sounds like the water pump.

the fact that it has overheated, many times i assume, you may have damaged the head gasket. have a leak down test done to confirm the head gasket

Roy

Answered by ASEMaster6371 (expert)
24,973 answers provided

The light comes on because of low coolant level... the water is boiling because the water pump is broken.

You need to replace the water pump, timing belt & tensioner.... you can check for correct water pump flow like this:

Bad: http://www.youtube.com/watch?v=thcwatH_BpI&feature=plcp

Good: http://www.youtube.com/watch?v=SJN3biTfdGE&feature=plcp

The stock pumps have plastic impellers that break:

http://www.youtube.com/watch?v=WJlS7MvfRXo&feature=plcp

This is a video of me showing what is involved to replace the timing belt & water pump on a 1.8T Jetta engine: (same engine as yours)

http://www.youtube.com/watch?v=SMoypqbXT9w&feature=plcp

Once those items have been replaced, you can verify thermostat & Radiator fan operation.

Thomas

Answered by exovcds
0 questions asked