WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
Fig 1: Identifying Hose To Heater And Hose
Courtesy of VOLVO CARS OF NORTH AMERICA.
Connect hose (1) to heater and hose (2) to the water pump, adjust so that they do not rub against sharp edges or similar.
Tighten hose clamps until the screw heads break off.