Heater fan picks up radio 4!!

[ric220]

Hi All.
Having recently complained that my heater fan has died (ran very slowly or not at all, totally dead for past month), this morning at start of my 35 mile commute it came on, albeit very very slowly! There was a slight rumble (probably would have gone away if running at normal speed), and after turning radio on, a distinct interference "click" was heard at same speed as the fan! I quickly ran a series of tests to see if my heated rear window hadn't turned into an MP3 player as well, but no luck. Does this indicate heater motor may in fact be ok, but poorly earthed?? Where would I check (I know naaathing 'bout electrics - I still rub the dead batteries in remote controls expecting it to spring to life and am disappointed when nothing changes...).
Thanks in advance.
Rich

 

[Myros]

it probably wants a capacitor

that would smooth out the interference. Most likely the on already in there has broken down. Or the brushed for the motor are the end of their life and are arcing a bit. or some other electronic doings

 

[ric220]

Thanks - am not too bothered about radio interference at mo - am due to get heater motor replaced next month at big cost so just want to make sure it's really busted. Is there anything I can do to check whether there is a dodgy earth to motor or any other prob? As I say, I'm useless with electrics so suggestions would need to be in detail if poss.
Many thanks, apologies for being a pain...

 

[television]

Hi All.
Having recently complained that my heater fan has died (ran very slowly or not at all, totally dead for past month), this morning at start of my 35 mile commute it came on, albeit very very slowly! There was a slight rumble (probably would have gone away if running at normal speed), and after turning radio on, a distinct interference "click" was heard at same speed as the fan! I quickly ran a series of tests to see if my heated rear window hadn't turned into an MP3 player as well, but no luck. Does this indicate heater motor may in fact be ok, but poorly earthed?? Where would I check (I know naaathing 'bout electrics - I still rub the dead batteries in remote controls expecting it to spring to life and am disappointed when nothing changes...).
Thanks in advance.
Rich

any interference is normally generated by the carbon brushes, the only way to test it is to put the full 12v through it.

Malcolm

ps I could send you a variable condenser you could couple up to give you Radio 1 or 2