Is it less likely to stall when using air conditioning during the test?

[LeNathan]

This is the case because after turning on the air conditioning, the engine will automatically increase the idle speed to ensure the operation of the compressor. Although this reduces the chance of stalling, the vehicle speed will also increase accordingly. To avoid stalling or rolling back, it is essential to apply throttle during hill starts. During practice, you can use the foot brake instead of the handbrake to train the coordination between the throttle and clutch. 1. Reasons for rolling back: The phenomenon of rolling back occurs in the driving test because the clutch contact point is not lifted sufficiently. If no throttle is applied, it is likely that the idle speed is insufficient to drive the car to start on the slope, resulting in stalling. 2. Reasons for stalling: Stalling occurs when braking or lifting the clutch in a hurry after rolling back. It could also be because the handbrake was released too late during the start.

[MacEdward]

With over twenty years of driving experience, I can tell you that turning on the air conditioning during the test can indeed make the car more prone to stalling. This is because when the AC system is operating, the compressor requires power from the engine, which adds extra load. Especially at idle, the RPM may drop sharply. If the engine's idle control system has carbon buildup or aging issues, such as a stuck idle motor, the sudden increase in load when the AC is turned on can cause the engine to stall outright. Worse, during the road test, frequent stops and starts or waiting at traffic lights with the AC on can increase the risk of stalling, especially for nervous beginners who may not coordinate the clutch properly. A small pre-test check is recommended: warm up the engine and check if the idle is stable. It's best to keep the AC off until the core test items are completed, turning it on only when the car is stable to avoid unexpected point deductions.

[JanelleFitz]

As an automotive technology enthusiast, I want to emphasize that turning on the AC does increase the risk of stalling. The principle is simple: the AC compressor is connected to the engine via a belt, and its activation immediately adds load. If the idle speed is lower than the normal range, say around 800 RPM, the engine can't handle it and is prone to stalling. This is more common during driving tests, where examinees may be inexperienced, leading to unstable clutch engagement during gear shifts. Coupled with the energy drain from the AC, the sudden increase in load when starting or idling can overwhelm the engine, causing it to stall. To prevent this, I recommend warming up the engine for five minutes before the road test to stabilize the idle speed. Additionally, practice parking and starting with the AC on during regular training sessions to develop a better feel for it.

[StAmy]

When my child was taking the driving test, the instructor reminded them not to randomly turn on the air conditioning during the exam, as activating the cooling system would increase the engine load. A high engine load can cause a significant drop in idle speed, and if the car stalls suddenly while waiting at a traffic light, the test would definitely be failed. My child mentioned that similar issues often occur in real-world driving, and the solution is to maintain a stable engine temperature and avoid frequently turning the air conditioning on and off.

[DelAnna]

In my car repair experience, I've encountered many cases of stalling when the air conditioning is turned on, with the core issue being insufficient idle control. When the AC is activated, the engine needs to provide extra power to maintain the compressor. If components like the idle speed controller (such as the idle air control valve) are clogged with carbon deposits or sensors fail, the idle speed cannot be adjusted upwards, leading to stalling. To be safe during an inspection, it's best to have a mechanic check the idle control system and the condition of the AC compressor in advance.

[GabrielleRose]

I just got my driver's license recently and realized one thing: turning on the AC during the road test increases engine load, making it easier to stall at idle. Our instructor taught us to practice starting and stopping without the AC first, and only turn it on after the car is moving steadily if it gets too hot. Because beginners have unstable clutch control, when the AC is turned on, the engine load increases, RPM drops, and the car stalls. Staying calm and operating smoothly is key during the test.