open bonnet.remove plastic scuttle pannel near windsreen.looking from front of car,just under left wiper wheel box,,think theres 4 or 5 wire plug and 2 spade ternmials,held in by torx screw on later models,,also known as rheostat,£25 approx from vauxhall,2 different ones 4 + 3 speed versions,,
tony, April 2009