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Thanks
I'm pretty sure mine is only single speed. There's only one relay for the fan.
Also I can't believe the high speed fan comes on whenever the thermostat is open. The thermostat is open the whole time the car is running after it has reached temperature there's no need for the fan to be on just because the stat is open.
anyway: As a follow up to this
Yesterday I took the car into a BMW specialist place and they very kindly ran it through their diagnostics for free.
It produced a list as long as my arm of fault codes but he did say that a lot of them could have been produced when I unplugged things or removed fuses (which I have done a lot of!)
There was 2F22 500 miles ago which coincides with the problem starting and indicates the temp sensor.
He reset the whole lot and said anything that comes back is worth checking out.
The reset fixed the fan and the starting problem (who knows for how long though) so maybe it just needed a reset after I changed the temp sensor
Anyway at least I now know it's not a wiring fault.
Shout out to the great garage for doing that for nothing! BMR performance in Turners Hill (UK)
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