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Discussion Starter · #1 ·
R55 Cooper Clubman but I assume it's the same as an R56??.
2010, 50,000 miles

This has just started happening: Fan comes on when the engine is cold and continues to run for a while after the engine is switched off even though the engine is cold( like 45C read from OBD as the car doesn't have a gauge!!). AC on or off makes no difference.
This symptom also started at the same time: Sometimes takes 3-4 times to start the car or it starts then dies immediately, I assumed this was the temp sensor sending the wrong information to the ecu and under-fuelling what it thought was a hot engine so I replaced the temp sensor. It made no difference. No fault codes at all on the OBD reader.

If it wasn't for the bad starting I'd think it was the fan unit but I'd like to have other ideas as that's quite expensive.

This car only has the R3 relay not the R4 as well so I assume it's a single speed fan.

Any ideas? TIA.
 

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Discussion Starter · #2 ·
As a follow up to this
Today 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
 

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BMR looks to be a fantastic outfit. Gutted I'm north London, will try and get down to them one of these days.
 

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Discussion Starter · #4 ·
As a follow up to this, the fault returned. I changed out the whole thermostat housing which I didn't realise has another sensor underneath it (built in and non replaceable) . I have no idea what that further sensor does. Anyway it seems to have fixed the problem. Getting the small clip back onto the water pump to thermostat housing was a total bitch of a job. I can only assume that garages would remove the intake manifold to do that. I didn't and you need the hands of a pixie with the strength of an ox.
I bought my own code reader which reads and resets the codes that don't cause dashboard lights to come on. I can recommend it as inexpensive and functional.
 
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