E34 535i heater blower only works on full?

[Bogracer]

Hi working through the niggles, the heater blower only works on full not on the lower setting?

Hint, tips and fixes please?

Cheers,
James

[johnfm]

is it the Heater FSR?

Just about to replace mine - the fan is pulsing at most speeds except full an minimum.

It is a spiky looking thing (a resistor module with cooliing spikes). bout £24-40 part and a very tricky 1 hr job.

[Pole84]

Sounds like you need a new heater resistor.

You should be able to pick them up quite cheaply off ebay. Search for "hedgehog resistor"

[Six Fiend]

On mine it was the actual dial switch (the innards corrode), took it out and cleaned it up. Worked a bit then gave up properly so got a new one and job done

Here's the guide for sorting it out if it's not the switch:

http://www.bmwe34.net/E34main/Maintenance/Electric...

[Frances The Mute]

The E34 resistor unit is built in, so you'll need to replace the control panel.

They're a common failure point.