1) Locate the serial number on your VW engine. This will be stamped on the crankcase, or at the bottom of the generator/alternator stand. You can locate the generator/alternator by following the serpentine belt until it crosses the alternator pulley. Look between the pulleys for the number and write it down.

2) Go online to [You must be registered and logged in to see this link.] Here you will find a chart with three columns.

3) Look down the third column, on the right of the chart, until you find numbers matching the first few letters or numbers of your serial number.
       
4) Once you find the match in the third column, look to the left. The first column will tell you the year of your engine.