need to know where transaxle fill plug is located it has a 5 speed transaxle on 1990 Volkswagen Jetta

It is actually a 1985 Jetta with a 1.6 turbo diesel

Asked by for the 1990 Volkswagen Jetta
there is a hexagon plug on the side of the transmission it is a 17mm allen you need to open it to check the fluid level