Where is the thermostat located and can you change it from the top without going under the car?How do you change the thermostat on a 1998 vw jetta TDI?The thermostat is located at the lower Rad hose on VW's. No you can not get it from the top. You have to first drain the system and then it is tricky because the housing is behind the A/C compressor.
The larger question is why change it? If you have an overheating problem, better to take it to a trusted professional.How do you change the thermostat on a 1998 vw jetta TDI?most thermostats are inside motor at end of top radiator hose every easy to remove top hose and two bolts in housing buy new thermostat new gasket clean off old gasket replace sam eway it come out dont over tighten bolts hour maybe