How to Do a Mercedes Air Conditioning Reset

One of the most common complaints of Mercedes users is issues with the air conditioning system. In many models, the AC keeps blowing hot air even after recharging the coolant. It is a frustrating problem, especially during the summer, when it is almost impossible to drive a car without the AC on. A Mercedes air conditioning reset is a possible solution. Do you know how to do it? Is there any other way to fix the glitch?

How To Do A Mercedes Air Conditioning Reset?

All Mercedes cars have a series of service lights that there is something wrong with an internal component or system. However, there might not be any damage in the AC unit when it is blowing warm air or not running properly. It could be a temporary fault and a reset is likely to be enough to restore the normal function.

Sometimes, the process is called a Mercedes climate control reset. The reset procedure is similar no matter whatever you call it. However, if the AC shows any trouble after resetting, you have to take it to a servicing shop or the dealership for a permanent fix.

mercedes climate control reset
Resetting the AC is a simple task. (Photo Source: mercedesclub)

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Mercedes Air Conditioning Reset

Step 1: To do the resetting, you have to insert the ignition key to its slot and turn the ignition cylinder to the position ‘2’. This is the highest point that the cylinder can go without activating the engine.

Step 2: Press the buttons for recirculating air and defrosting at the same time and hold them for somewhere between 5 to 10 seconds. To be on the safe side, hold them until their LED lights start flashing.

Step 3: Wait for about a minute for the LED lights to stop flashing. When they do, turn the car off. Wait one more minute before restarting the engine.

The AC system is reset now and the hot air blowing problem is likely to be solved.

If your Mercedes car does not respond to this procedure, you should check the owner’s manual. For example, if you want to know about Mercedes E320 AC reset, it is better to check the manual and follow the manufacturer’s recommendations.

AC Blowing Hot Air: Other Possible Reasons

If a Mercedes air condition reset does not work, these following reasons could be causing the trouble:

When the AC is releasing hot air, the possible reason could be a defect in the damper. The component is in charge of the air path that goes into the cabin. Check the onboard computer if it can verify the damper’s position. If one of the controls is ‘out of range’, the damper is surely the root of the problem.

mercedes air conditioning reset
Look for other reasons when resetting does not work. (Photo Source: specialist-auto)

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A leak in the AC refrigerant is most likely the culprit when the blown air not hot but not cold either. It could also be a clogged AC fan blower motor. The first one could result in an expensive repair but fixing the second component is easier and less inexpensive.