Great Wall Haval 2.4 turns on the air conditioner at idle speed 1 100 to 750. The engine is noisy and has no power. Increased fuel consumption

Your car is an old car. . . Many questions,

First of all, you can smell gasoline. Maybe the exhaust pipe under the car is broken.

Is there belt noise when your car starts? Check whether the value-added belt is loose.

I used to have an old Pu Sang with the same problem as you, but I went to have it repaired.

It seems that three belts and a cylinder pad have been changed.

By the way, I forgot to ask you. Is there a breeze in your car? If so, turn off the breeze and have a look.