What is the reason for the engine jitter when the air conditioner is turned on?

Both air conditioners and fans may be controlled in two or more stages, that is, when the temperature (water temperature, compressor) reaches a certain level, the working conditions will change.

For example, if you idle for half a day, because there is no oncoming wind, the water temperature cannot be effectively dissipated through the radiator. At this time, you need to increase the power of the fan to dissipate heat. So the jitter at this time is actually caused by the accelerated rotation of the fan.

High-end models, fans and air-conditioning compressors are all stepless controlled, so there is no such problem.

If the air conditioner is not turned on in cold weather and the engine vibrates irregularly, you can consider: cleaning the throttle, injector, oil filter and air filter, checking the throttle motor (idling motor, which varies from car to car), and then taking the high speed!