What Causes the Car to Feel Underpowered When the Air Conditioner is On?

[LaRachel]

Because the car's air conditioning compressor is driven by the engine, it consumes a portion of the engine's power. Here are the relevant explanations: 1. Direct Drive: Unlike household air conditioners, car air conditioners are usually directly driven by the engine, with power typically ranging from 1kW to several kW. However, when the air conditioner is turned on, the blower is usually also activated for air circulation; otherwise, effective cooling cannot be achieved. 2. Power: The car air conditioning compressor is the source of cooling, and its power comes from the engine. The compressor alone consumes approximately 2KW of power when operating, along with related current consumption.

[DelHope]

I've been driving this car for over a decade, and every summer when I turn on the AC, I feel the engine struggling. Mainly because the AC compressor diverts some of the engine's power once it starts, especially noticeable in smaller displacement models. If you also neglect regular maintenance, like a clogged air filter reducing intake efficiency, the engine's combustion becomes less efficient, naturally leading to decreased power. Additionally, prolonged high-load operation, such as driving fully loaded or climbing hills, results in slower acceleration. I recommend regularly checking the cooling system and filters, and cleaning the throttle body can also help alleviate the issue, keeping the engine running at its best and avoiding dangerous power shortages during sudden lane changes or overtaking.

[LeLiam]

As a frequent driver, I've noticed that the power weakens when the AC is turned on, often due to inadequate maintenance. A clogged air filter can restrict airflow, reducing engine output; if the fuel line is blocked, poor fuel supply further hampers performance. Avoid aggressive acceleration during daily driving and start gently to reduce strain. It's also worth checking if the compressor belt is worn or loose, as this affects transmission efficiency. Timely replacement of worn parts and system cleaning can effectively improve power response and ensure smooth driving.

[StDawson]

I just bought this manual transmission car not long ago, and it feels sluggish when starting with the AC on. It turns out that the AC compressor consumes engine output power, occupying about 10% of the power. Especially for older cars or those with small displacements, acceleration is more affected. Usually, pay attention to the engine temperature to avoid overheating and ensure the fan is working properly, which can alleviate this sluggish feeling. Cleaning the throttle body or replacing spark plugs can also help.