Vibrations on the road when the air conditioner is on and waiting at traffic lights

[omrdml]

Hello everyone,

I would like to share with you a few problems I experienced with my vehicle.

1. The temperature in the area where I live is quite high these days (42C). I have a problem with the speed fluctuation, especially when the air conditioner is on, while driving on the road, or while waiting at traffic lights. I think the vehicle is playing with the engine speed to compensate for the excess energy consumed by a unit.

I understand that when the air conditioner is first turned on, it increases the idle speed of the vehicle, but doing this constantly on and off while driving on the road reduces my driving comfort greatly.

2. I experience this problem constantly. While waiting at the traffic lights, we wait with the gear in D. In this case, I think the EAT6 transmission does not shift itself to N position. For this reason, there is a constant vibration in the vehicle. Is this situation normal? If I shift the gear to N, that vibration disappears. The weird part is that sometimes it can wait without trembling. If this flickering is a normal situation that should be accepted for the EAT6, I don't understand why it doesn't shake at all sometimes.

Thanks everyone.

[Beanee3]

When the Aircon is on yes the engine idle rises to compensate for the load of the compressor. It sounds as though yours is increasing to much and when you sit at traffic lights the automatic transmission is trying to move the car. No the EAT boxes do not shift to N when at rest.
During running the Aircon cycles or you would get very cold in the car so sometimes it will not be engaged whilst at rest.
Other possibility is that the lower engine mount is loose and the exhaust is hitting the floor.

[omrdml]

Hi Beanee3

In fact, the engine speed is 800 rpm under normal conditions, and between 950 rpm and 1000 rpm when the air conditioner is on. In other words, it does not rise high enough to move the vehicle.

To summarize the situation once again, there are two situations when the air conditioner is on. Firstly, the vehicle revs up and down at intervals of 30 seconds and 1 minute, both when it is stationary and while it is moving. This creates a situation where it moves forward and shakes while moving. He also does this while waiting at traffic lights. Secondly, there is a vibration in the vehicle when the air conditioning is on and waiting at traffic lights. The vehicle is a 2024 model, by the way.

You said that EAT6 does not shift the gear to N when the vehicle is stationary. Do any of you, to a greater or lesser extent, experience a slight tremor while waiting at traffic lights, whether the air conditioner is on or not?

Thanks.

[Beanee3]

Ok this is what my C3 Aircross Shine Plus EAT6 2023 does.
Engine warm normal temp 90 c. OAT 21 C .Car stationary on level ground.
Engine off, in P.
Foot on brake.
Start engine. Idles at approx 850 rpm.
Select stop/start Off
Foot on brake.
Foot off accelerator.
Engage D.
Can feel car trying to move.
Release brake.
Foot off accelerator.
Car moves forward and reaches and maintains 4 mph.
Apply brakes. Come to stop.
Select N
Engage Aircon. Engine note drops as the compressor loads it. Rises back to 850 rpm.
Brakes on
Select D
Can feel car try to move
As before the car moves forward and maintains 4 mph.
Apply brakes
Come to stop.
Select P
Switch off air con. RPM rises to approx 1100 rpm but cuts back to 850 rpm quickly.

[omrdml]

Hi Beanee3,

Thanks for your return. Do we need to see this as a chronic problem?

[Beanee3]

I'd have it looked at as my C3 Aircross is smooth at halt with Aircon on.