It goes through the timing belt cover, behind which you will find the thermostat housing, it goes on a plastic or, in your friend's car's case, probably a brass nipple that is threaded into the t-housing. Read up on the other post that deals with thermostat/coolant hose that is active right now, and all will be revealed. It's a fiddly affair caused by a construction fault in my opinion: https://www.matthewsvolvosite.com/forums ... 11&t=37005