Heater fan not working. NOT resistor pack.

[Fishfire]

Ho All, hoping someone can help with this.

So I fixed the hot/cold control that had the standard crack in it, and prior to this, the fan was fine. Only issue was getting stuck on hot or cold.

Unplugged both servo motors, removed and zip tied the cracked hot/cold control ring. Promptly bolted it all together and now I have no fan at all.

I removed the resistor pack and bridged the pins and the fan came on immediately so I thought it's the resistor pack. Well, I've now tried three proven, good resisters and it simply won't work with a good resistor pack attached.

Is there another part of the system I need to check, because I'm now stumped!!

 

[Fishfire]

UPDATE

So I replaced both the stepper motors and a thd wiring and hey presto, I have.....most of it but not all 😕

- Fan control WORKS
- Blower position WORKS
- Hot/Cold mixer stepper motor NOT working 😣

The plastic ring was repaired, its the stepper motor not activating.

Any ideas?

And anyone know what this plug is?
It wasn't plugged into anything and comes off the loom to the climate control panel