Try vw vortex.com. Or get a good Repair Manual.
Ever noticed how some people's answers are so negative? Unlike Mark's unfair assessment of water pumps, I have driven VWs of various engine designs and have had no failures.How do u change a thermostat on 2001 VR6 jetta?By replacing the water pump and timing belt at the same time. Given the truly crappy design of the water pump you'll want to do it all at the same time. It's not if but when your water pump will fail.
