MG mg7 air conditioning relay has no signal wire.

Check for fluorine. Fluorine-free compressor does not run, with power-off protection function.

You can also check again whether the air conditioning panel has power supply, whether the negative network is normal, or whether the fuse of the air conditioning control unit is powered normally.

The signal is controlled by the engine computer. It may be that the engine electronic control system is faulty, the water temperature is too high or the throttle signal is faulty.