My E53s main blower had been playing up for about a year or so. It is pretty much constantly running with auto a/c on and with15yrs/115k miles under it's belt it's done well really.
Symptoms - would just suddenly stop working despite control panel still illuminating/changing values etc. Wishing it was just the FSR, in my case it turned out not to be. Case of an ageing blower motor/worn brushes. I replaced the original BMW FSR though just in case.
I managed to get the blower going again by removing the cabin air filter tray from the bulkhead gaining restricted access to the blower blades. Enough for me to spin them by hand, spraying a bit of contact cleaner in there and eventually coax the blower into life again. Had worked a treat a couple of times over 2020 as wanted to avoid a dash out scenario. December it stopped again and that was it. No luck with the spinning this time. Resided to the fact it was dash out new blower motor time in Jan.
I've successfully removed the whole dash (also involves airbag removal so disconnected battery earth from spare wheel well). Have fitted a brand new Febi Bilstein blower and a brand new Meyle FSR. Now here's my problem. When I connect the battery earth the new blower immediately kicks in on full power. Great to hear a blower again but not constantly.
The a/c control panel fan speed rocker switch will not reduce it's speed or indeed switch it off. No difference if I have the ignition on or not. It is just constantly live. I have tried another brand new FSR just incase had a faulty one but no. Obviously if I unclip the FSR power is cut to the motor and therefore does stop.
I'd like to get her all back together again asap so any ideas where I'm going wrong? Why does the motor now have a permanent live. My only other thoughts are to try another a/c control panel &/or the ignition switch module?? But don't really want to be just chasing my tail and forking out unnecessarily.
Any help/pointers appreciated
Dom
