close-up look at engine under the hood

Reasons for no cold air from the AC

Why is my car’s air conditioning not blowing cold air?

Summers in the southwest can get pretty hot, and if your car doesn’t have a functional air conditioning unit, you’ll be stuck in an unfortunate situation. While many drivers never have to deal with an air conditioning system that blows hot air only, some of us do, and it can make long road trips miserable. Take a look at some of the reasons below why your car’s air conditioning may not be blowing cold air!

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mechanic posing by a car with an open hoodAC compressor isn’t circulating refrigerant

The AC compressor has the function of circulating refrigerant through the system, providing cool air that will blow out of the vents. There could be a leak in one of the seals, which will cause contamination with exterior debris. This can stop the cold air from coming out of the vents.

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Contamination of the Accumulator/Drier

The purpose of the Accumulator/Drier is to absorb moisture, because moisture in the internal system can damage the components inside. If moisture or any other kind of debris builds up, it will cause the system to malfunction.

Refrigerant levels are too low

While damage to one of the components is often the reason for warm air blowing out of the vents, sometimes it’s simply a lack of the refrigerant itself. Refrigerant may have leaked out of the compressor, or there may have not been enough there to begin with. Check to see that the levels are high enough and refill if necessary.

AC evaporator is old and worn

The AC evaporator is like a giant ice cube, holding onto the cold air and circulating it back through the vents. Over time, this system can age and become less effective, resulting in warm air blowing out of the vents.

If you’re struggling with a malfunctioning AC system, come chat with us here at Mercedes-Benz of Gilbert and see what our service team can do to help you out. They’ll have you back on the road with a working AC system in no time. Schedule a service appointment today!