Does the car air conditioning not cool when the engine is off?
2 Answers
When the car engine is not running, the air conditioning switch can be turned on, but the air conditioning system does not function - it only blows air. This is because the air conditioning requires significant power consumption that the car battery cannot sustain. Therefore, when the engine is off, the air conditioning automatically enters protection mode and cannot operate. Below is relevant information: 1. Automotive air conditioning system: The car air conditioning system is a device that cools, heats, ventilates, and purifies air inside the vehicle compartment. It provides passengers with a comfortable environment, reduces driver fatigue, and improves driving safety. Different types of air conditioning systems have varying layout configurations. Most passenger cars use integrated heating and cooling systems. 2. Layout configuration: The typical layout combines the evaporator, heater core, centrifugal blower, and control mechanisms into a single unit called the air conditioning assembly.
Having driven for many years, I often encounter similar issues. When the car isn't running, the air conditioning indeed doesn't cool. This is because the AC compressor is driven by the engine. If the engine isn't running, the compressor stops working, the refrigerant can't circulate, and naturally, no cool air comes out. Once, I sat in the car wanting to cool down without starting the engine, only to find the AC blowing out hot air—completely futile. I also asked a mechanic friend, who said this not only wastes battery power but could also damage the starting system, leading to a drained battery. Since then, I've remembered to always start the car first when I want cooling, waiting until the engine warms up for the AC to be effective. Additionally, in the summer heat, this habit can protect the car, avoiding extra wear from frequent starts and stops.
