{"id":32958,"date":"2024-11-11T02:23:33","date_gmt":"2024-11-11T10:23:33","guid":{"rendered":"https:\/\/getjerry.com\/wp-site\/?p=32958"},"modified":"2024-11-20T08:53:11","modified_gmt":"2024-11-20T16:53:11","slug":"why-does-my-car-ac-only-work-when-driving","status":"publish","type":"car-repair","link":"https:\/\/jerry.ai\/car-repair\/why-does-my-car-ac-only-work-when-driving\/","title":{"rendered":"Why Does My Car A\/C Only Work When Driving?"},"content":{"rendered":"\n

Question:<\/strong> I hate the heat and I\u2019ve been noticing that my car\u2019s air conditioning system stops working when I\u2019m stopped at a red light or if I\u2019m idling. Why is the A\/C only working and blowing cold air while I drive?<\/p>\n\n\n\n

Answer:<\/strong> If your AC only produces cool air when your car is moving, then you might have a fault somewhere in your AC system. Let\u2019s take a look at possible suspects.<\/p>\n\n\n\n

Faulty AC condenser fan<\/h2>\n\n\n\n

A faulty AC condenser fan could explain why you get decent air conditioning while moving but nothing when you are stationary at a red light or while parked.<\/p>\n\n\n\n

Here\u2019s how it works in simple terms. Refrigerant in an AC system goes through the system, into the cabin of your vehicle, absorbs heat from the cabin, and then goes to the AC condenser in your engine bay to get cooled.<\/p>\n\n\n\n

When you are driving, air that moves over the AC condenser provides the wind chill required to lower the temperature of the refrigerant. However, once you stop driving, you have to depend on the AC condenser fan to provide the wind chill. A broken AC condenser fan would cause poor heat dissipation, causing a stark contrast in performance of your AC when you\u2019re in motion and when you\u2019re stationary.<\/p>\n\n\n\n

Low on refrigerant<\/h2>\n\n\n\n

The quantity of refrigerant is important because it acts as the medium for heat exchange. If your refrigerant is at required levels, you should have no problems getting cool air from your vents. However, if your refrigerant levels are low, and you notice that there\u2019s a correlation between higher RPMs and air conditioning performance, then you should check whether you are low on refrigerant.<\/p>\n\n\n\n

How this works is that as you increase your engine speed, the AC compressor has an easier time pumping more refrigerant through the system. However, at idle speeds, the anemic AC system might not be able to pump enough refrigerant through your system.<\/p>\n\n\n\n

Blockage in condenser<\/h2>\n\n\n\n

While the AC system should be a sealed system where no debris or foreign objects should be able to enter, old systems can decay and allow foreign particles to permeate into the system. These clog the system, leading to a poorer flow of refrigerant through your AC.<\/p>\n\n\n\n

When it\u2019s normal for AC not to work while driving<\/h2>\n\n\n\n

There are also some circumstances where your AC wouldn\u2019t produce cold air. Some modern cars have a start-stop function which shuts down the engine when you stop your car at red lights. In most cases, when the engine is off the AC does not run, only the blower fans do, which could be one reason. However, some vehicles with stop start technology have electrical AC systems, meaning they will continue to run when the engine is off.<\/p>\n\n\n\n

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