Where is the clutch auto adjustment located at on a 98 manual Volkswagen jetta?

You most likely have a hydraulic clutch, which the clutch master cylinder is located on the firewall on the driverside close to your drivers side windsheild.it takes brake fluid to fill dot brake fluid will fill it properly. however if your slave cylinder on the transmission is leaking,this will require a replacement of the clutch slave cylinder. look for leakage under passenger side,,just under or below passenger side seat onto ground. recommend if you replace the clutch slave cylinder,you also replace clutch master cylinder located on the drivers side firewall at wind sheild.look under the car while someone pumps the clutch in and out,if you see brake fluid leaking under car onto ground or inside onto carpet at brake pedal,you have a bad clutch master cylinder. recommend you replace both slave cylinder and clutch master cylinder. this will save you lots of time and headaches. thank you for choosing fixya.com