46+ 2008 Audi A4 Ac Compressor Relay Location For audi a4 (b8), audi s4 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 model year. Yesh, haven't pulled codes yet, will do that later this week. VWVortex.com - HELP: fuel pump kill switch from i18.photobucket.com 2005 audi a4 #384 ac compressor relay energizes the solenoid valve there is no clutch 2005 audi a4 #384 ac compressor relay energizes the toyota is aware of a high failure rate from these relays, and has issued a technical sevice bulletin regarding this.