What kind of coolant do i need for my volks jetta 2001?

Here is what they say: { ... if your antifreeze is green in color, it's likely ethanol glycol (cheap stuff) and is detrimental to the Vw cooling system and needs to be changed immediately. Click here for our flushing instructions. Use ONLY anti-phosphate anti-amine antifreeze in your Vw. This prevents scale and lime deposits from forming. Other coolants can clogs radiators, bulge hoses at connection points, and weakens plastic sections of your cooling system (see image below). Changing your Vw antifreeze with anti-phospate anti-amine coolant helps extend engine life! ... } VW sells Blue, Pink or Red, and Purple Vw Antifreeze. While I personally believe that anti-freeze type makes no difference at all, I suppose I would be tempted to stay with whatever type it already has in it. And while they will try to talk you into change antifreeze every couple of years, it is better not to. It does not wear out with age, and new antifreeze will allow a small amount of corrosion until it becomes electrically neutral.

VW engines require specific coolant and can not be intermixed with other coolant, because vw coolant is silincant free. MK4 generation golf/jettas use the Pink Coolant, which every VW dealer sells for around $18 for a gallon.