Heater Blower not working..

[Multispacer]

Had the [quite common] fault appear on the B9 Multispace [2008] or the heater no working on any selections. Went for the relay first as everything seems to point to that as the most common cause. It wasn't that.

Ordered a resistor pack that turned up recently and had a chance today to practice being a contortionist in the driver's side footwell.

And I took out the plug and went to undo the screw that holds the pack in place........and another "curve ball" it's not a screw or even a torx headed bolt but just a normal hex headed bolt but it's tiny [smaller than 6mm] Smallest sockets and spanners I have are 6mm and they are too big.

Anyone know what size the bolt is please as I'm going to have to go out and buy a tiny socket tomorrow?

[Before any says it, I've tried getting a pair of pliers on it as it's only a small bolt but they keep slipping and there isn't really great access]

[Multispacer]

Answering my own question, someone at PSA has a weird sense of humour. The hex bolt head size on the resistor pack for the heater is 5.5mm !!! [I double checked this with some digital calipers when I got it out as I couldn't believe they used such a strange size]

Remembered I had bought a small set of metric spinners for working on computer building and the largest in the set was 5.5mm....

Replaced the resistor pack [it went back with a philips headed bolt] and guess what............It still doesn't work on any settings!!!

So have replaced both the relay and the resistor pack..............any ideas where I go next??

Going to have to get out the meter when I'm next off work to check for supply but the only other things in the system I assume are the selector switch and the actual blower fan??

Anyone got a wiring diagram of the system they would like to share please?

[Sol]

The selector switch, fuse, and wiring could all still be culprits. The switch should have 12v at one of the pins all the time I expect. I'd get the meter out mate.