Section 3 (Specifications & Drive Belt Routing): Description
WARNING: This page is about a different car, the 2001 Volvo S60. However, it is still accessible from the selected car via links, so may be relevant.
Electric cooling fan is operated by a relay, either in response to engine temperature signal received by Motronic control unit or directly by pressure switches mounted in A/C high pressure line. Cooling fan relay is located in front of battery.