58rabbit 0 Report post Posted October 25, 2013 I have this problem where the heater fan is running constantly even when the key is removed from the ignition and the aircon display is totally dead. this happened very suddenly after getting out of the car last night. to stop the fan from draining the battery I have disonnnected the battery. can anyone give me some tips as to what the problem might be? and how can I isolate the fan in the meantime? Quote Share this post Link to post Share on other sites
tmase 19 Report post Posted October 25, 2013 Final stage resistor unit, very common, luckily it's not too hard to replace. Ray at Hell BM might be able to sort you a replacement. I've changed two in my E39 in the past. Quote Share this post Link to post Share on other sites
58rabbit 0 Report post Posted October 25, 2013 Final stage resistor unit, very common, luckily it's not too hard to replace. Ray at Hell BM might be able to sort you a replacement. I've changed two in my E39 in the past. Thanks for quick reply, but where is this resistor? Quote Share this post Link to post Share on other sites
allan 295 Report post Posted October 25, 2013 As stated a common problem get a new one as they have been improved upon, pull the heater fuse from the main fuse box the card should tell you which one it is. Quote Share this post Link to post Share on other sites
tmase 19 Report post Posted October 25, 2013 In behind the dash, you can reach it from the drivers foot well if you remove some trim. http://www.bimmerfest.com/forums/showthread.php?t=143393 should help, just remember you have a RHD car not a LHD one Quote Share this post Link to post Share on other sites
allan 295 Report post Posted October 25, 2013 Left hand side of the drivers foot well it's behind the covers tucked away in the heater matrix, plenty of write ups on how to replace them about 20 minutes from memory. Quote Share this post Link to post Share on other sites
58rabbit 0 Report post Posted October 25, 2013 thanks for all replies, most helpful. anyone know where I can get one of these today?? Quote Share this post Link to post Share on other sites
tmase 19 Report post Posted October 25, 2013 Probably the dealer if you need one ASAP, but I doubt it'll be all the cheap there. Quote Share this post Link to post Share on other sites
58rabbit 0 Report post Posted October 25, 2013 is it okay just to disconnect it until I get a replacement?? Quote Share this post Link to post Share on other sites
BM WORLD 1283 Report post Posted October 25, 2013 have in stock in papakura can get one today if needed bm world ltd 021433600 thanks brent Quote Share this post Link to post Share on other sites
58rabbit 0 Report post Posted October 26, 2013 Have tried a 2nd hand one but does not solve problem. fan still running and no aircon Quote Share this post Link to post Share on other sites
mal6 0 Report post Posted October 26, 2013 Have tried a 2nd hand one but does not solve problem. fan still running and no aircon Quote Share this post Link to post Share on other sites
58rabbit 0 Report post Posted October 26, 2013 Got it fixed thanks to Brent at BM World, turned out to be a dead control module rather than fsr. thanks for all the info and BIG thanks to Brent. Quote Share this post Link to post Share on other sites
