Experiencing a thermostat problem with a 2013 Mini. Require assistance

[MrGreedy]

Hello. My 2013 Mini Cooper is displaying a code for the thermostat. P0128. The thermostat has been replaced, nevertheless the problem persists. The fan activates immediately upon starting the vehicle and continues to operate for about 10 minutes after shutdown. Identically to its function prior to the thermostat replacement.

I just replaced the head gasket and timing chain due to a ruptured freeze plug. I discovered a loose junction with orange and white wires behind the intake manifold. I cannot locate a nearby hookup for it, and my schematics indicate it should be for the friction wheel; however, my vehicle is not the electric version.

However, given that this is on the same circuit as the thermostat, it leads me to believe the problems are interconnected.

Are there any recommendations from the experts available?

Is there a method to reset the ECU to enable recognition of the new thermostat or a similar component?

Thank you.

[Rojoires]

The fan operates because the ECU detects a defect, serving as a protective measure.

P0128 may be attributed to:

Thermostat that is leaking or remains open
Insufficient engine coolant level
Inadequate warm-up duration
Defective engine coolant temperature sensor; the sensor harness is either open or short-circuited.
Deficient electrical connection in the engine coolant temperature sensor circuit

Provided that the coolant is adequately filled and thoroughly bled, and the thermostat installed is both accurate and functional (the mere fact that it is new does not guarantee its efficacy), I would examine the coolant sensor harness and connection, as well as trace back to the ECU for any signs of damage, corrosion, or a compromised connector. I would consider replacing the sensor and then clearing the codes.

[MrGreedy]

I have verified all your statements, although I remain doubtful when I believe I have completely bled a system. I will attempt it again, since pockets of air might unexpectedly emerge despite a consistent flow of water before.

Do you possess any information about the loose connection I am experiencing? The cable is around 6 inches and originates from a harness attached to the mounting bracket of the intake manifold. The last wire from this harness connects to the VANOS solenoid.

[p00rmansp0rsche]

This seems to be the guided oil pump feed, which connects to a harness at the back of the engine that passes through the base plate.

[p00rmansp0rsche]

It is a PCV heater located at the base of the PCV pipe, extending to the bottom of the intake manifold. In some vehicles, a heater is installed for emissions control to diminish NOx emissions via the breather system.

[MrGreedy]

The oil pump feed is not the issue, since it is linked to another comparable plug and is functioning well. However, I did not see a PCV heater socket on the manifold. I will examine it one more. Is it visible from under the vehicle? Must I disassemble the manifold one more?

Thank you very much.