There are several main reasons why a cars AC may not cool when in a stop and blows cool only when moving. The most typical reason is the cooling fan for the condenser isn't working. It's important to know that numerous times the cooling fan is shared by the radiator and condenser, sometimes there are TWO separate ones. The reason why a negative cooling fan can affect the AC so drastically may be the fact that heat from refrigerant (Freon) is normally cooled when passing from the condenser. So even if your condenser fan is NOT working, it may not get a new AC whilst the car is moving at highway speeds. This is because air is passed with the condenser when driving down the road and so the fan is not needed. When the vehicle is at a stop, the condenser is entirely dependent on the cooling fan to cool it down. Sometimes the cooling fan may be working, but it might be moving too slowly to sufficiently cool the condenser. To look at the motor, an exam light could be utilized to verify it is getting power and ground for the electrical plug in. If power and ground is present along with the motor is not working, the motor has a circuit. When the cooling fan motor is worn, it may be started sometimes temporarily by lightly tapping about the electric fan motor using a small hammer or wrench. If the fan turns at all when that is done, replacing the motor will be necessary. This is just another way to verify that it is receiving the power it has to operate. Also keep planned that a cooling fan may turn whenever you want (some even come on with all the engine off) so take care never to stick your hand within the way with the blades! Note that in the event the cooling fan motor has seized, it's likely that this fuse has blown also. So if there is no power towards the fan along with the motor is locked up, a fuse will more than likely need to become replaced at the time in the fan motor replacement.
Other Causes of Car AC Not to Cool at an Idle or possibly a Stop
The car could be overheating - brought on by something more important other compared to the cooling fan.
Heat transfer from your radiator to the condenser can alter efficiency, in the event the car is overheating.
The AC compressor will not be pumping sufficiently at slower RPM's (revolutions per minute).
An expansion valve might not be regulating the refrigerant correctly.
Condenser fins may be bent or the condenser could possibly be obstructed by foreign debris.
There are special condenser fin combs to straighten condenser fins. But during my experience, bent condenser fins aren't much of the common problem. A more prevalent problem should you drive inside country, is pollen accumulated with time in between the fins. Trash from the road being a plastic bag or piece of paper obstructing part of the condenser reducing performance sometimes happens anywhere. It's funny in my experience that inside my time being an auto technician, many customers came in concerned the AC wasn't cooling, but failed to notice that this car was overheating - even though the temperature gauge was pegged!
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