Purchased, installed and tested hand warmer. All connection points were found in the stock wiring of the Mark, no need to think about it. Quite a cool gadget. Pleasantly blows warm air on your hands and the steering wheel, without needing an electric heater (no need to heat up the car).

installation will require:

1-steering column cover with ventilation ducts and heating button

2-thermal motor in the housing

3-harness of wires with relay (can be made later myself, I'll add details)

4-control module

Before installation, everything is disassembled, cleaned, lubricated!
the heater and part of the wiring are installed on the steering column from below. Connect the connector to the stock wiring.
Reassemble the steering column cover.
Remove the glove compartment.
Find such a connector.
Connect the control module. Reassemble. Check. Enjoy!