Question

2000 Volkswagen Jetta overheating?

I have a 2000 VW Jetta 2.0 that has started overheating. About 2 months ago the temperature light came on but the car was not overheating at this point. I did some research and found out that the light will come on if the coolant is low in the reservoir. I added G12 antifreeze to it and it was fine for a week then i had to continue to add to it every few days. As of today, it is now overheating. The reservoir now boils and it seems to be shooting steam/coolant from around the thermostat housing area. The coolant level in the reservoir goes up and down. How can I tell if this is the thermostat or water pump that's to blame or something else?

Answers

Sounds like you've got air in your lines. I had the same problem. Does it really start boiling about thirty seconds after you turn the car off? You know, you might have a leak around the thermostat which let the air get in. Fix the leak and burp the cooling system.

#1

When the car overheats, do you get cabin heat? If not, its the water pump. VW uses a plastic impeller water pump which has a tendency to separate from the metal shaft. Water pump failures are fairly common.

#2

You haven't exceeded the antifreeze mix (max 50/50%) have you? too strong a mix causes overheating. plus it sounds like you have a leak near the thermo housing.

#3