Why did the 4s shop let me change the throttle when the air conditioner was turned on?

Hello, this is very simple. After you turn on the air conditioner, the car needs more power, but the throttle can't satisfy this. There are two reasons why 4S stores say this. I want to collect more money. If it is a cable throttle, the idle motor should be replaceable separately. The second is the electronic throttle, which can only be replaced together in this case, otherwise it is very likely that the problem will not be solved.