E46 Electric Fan issue

Ok so i acquired a 2001 E46 325i touring (Manual)
It has the Electric Fan ( Between Radiator and Engine ONLY ) no aux fan and viscus like the Auto models.

https://ibb.co/mhbosk

I have Searched But non specific to mine... All the others i read, the Fan STAYS ON After the car is turned off and locked. Mine goes off immediately when the car goes off.

It was knocked in front and I have repaired it..

First test driver after Accident repair:
* Car drove fine and Fan was not on
* At operating Temp, the Fan kicks on and made this Loud, metal on metal Noise.
* It disengaged ( Shut off ) and carried on with test drive.
*While siting and reading codes for a Missfire, noted the Temp gauge broke the halfway mark
* Fan refused to come on at all

I removed the Fan and it was pretty difficult to spin up...
So i figured it got hurt in the accident so i got a replacement part from a Breaker, it came off a 318i touring with about 180k on the clocks..
Fan looked near new condition...

Installed the new fan

Second test drive after Fan replacement:
* Car starts and after about a Minute or so, The fan kicks on
* this happens even on COLD START
* Fan stays on and spins at High speed all the time the cars on
* Fan switchs off when i turn the engine off
* Fan Stays off

Troubleshooting:
* Temperature stays at the halfway mark
* No errors Detected on Delphi
* Checked and Replaced the 50A Fuse on Fuse box
* Tested continuity on the Small Green wire to the Fan plug
* Removed and Refitted the Fan
* Checked Coolant levels
* Checked for water leaks
* Bled coolant system again

There are no Relays to check on these fan setups as the Silver control box between the Fan and the Plug is what communicates to the DME ... NO RELAY!! Thumbdown

Now, the Breaker is adamant that the fan is 100% ok and stated that the Car he removed the part from, (i was standing there when he removed it), blue its head gasket due to a Fault Thermostat and not the Fan not working.

With the Fan spinning, Clearly its "Working" but not as it should

Question:

* Is this Fan a DUD?????!!!!!
* Could a Faulty Coolant Temp Sensor cause this? ( I did not replace this during
Accident Repair )

Apparently i was told that BMW built in a Fail safe so that car does not overheat. When the Coolent temp sensor at the Radiator fails to give the ECU a temp reading, the ECu then Kicks on the fan to Not allow the car to overheat

There are still no codes at all...
I was told that should this fan burn out, It could start a Fire...
So a bit worried about this and the Breaker is not playing ball


Any info would help.

E46 Electric Fan issue