How do you replace the thermostat located on a 1991 VW Golf?

hi mate you have to take the alternator off and you will see the bracket that holds the alternator on i think there is 4 to 5 bolts on it take them off remove the bracket and you will see the water pump remove the pipes and 4 bolts pull the water pump off and you will see ablack cover on the bottom with 2 10ml bolts take them off and the thurmostat is there cheers tony hello, I have an M reg Golf gti, I found it quite easy to get to the thermostat housing by removing the steering oil pump. 2 vertical and one horizontal bolts and the adjuster bolt, this reveals the stat housing. Good luck witht the top 10mm bolt, it snapped for me. Good site. Hugh (Oxford)