View 2005 Audi A4 Cooling Fan Relay Location For the audi a4 b7 (8e, 8h) 2004, 2005, 2006, 2007, 2008, 2009 model year. Runs great but when i turn the key on the radiator cooling fans cycle on and off and this 506 relay clicks on and off i also do not have the fan relay is attached to the underside of the frame rail, below the battery tray.