Dont know about the 98's but if its anything like the mk4's it would be located in the fuse box that sits on top of the battery.
it is under the steering wheel behind the dash board
where is the starter relay on a 1998 vw beetle
starter relay location
Thermastat
The 1998 VW Golf flasher unit can be found beneath the drivers side dashboard. The flasher unit relay switch will be above the gas pedal.
It's a 30amp fuse for the rad fan motor on a 1994 vw golf 1.8L engine. It's location is #19
rtrt
unlikely, try a mk 3 golf instead.
i believe its right under the coolant container its the long black box if your fan its not coming on you can check the radiator by the battery side that's the temp switch they go bad too or check the fan belt.
On top of the battery
I have a 1998 VW Golf wagon with tire size of 195-60-R14. I believe it has the original size tires.
under the dashboard number 167.