Mercedes-Benz Idle Air Conditioning Not Cooling

1 Answers
StIsabel
07/30/25 8:28am
The most common fault when a Mercedes-Benz's air conditioning does not cool during idle is refrigerant leakage in the air conditioning system, leading to insufficient refrigerant and thus the air conditioning not cooling. The solution is to add refrigerant along with fluorescent dye. After the vehicle has been used for a period, inspect the air conditioning system with a specialized UV lamp. If there are any leaks, they will glow, allowing for the repair or replacement of the leaking components. During idle, the engine speed is low, causing the compressor speed to also decrease. Combined with insufficient refrigerant, the instant pressure boost fails to reach the standard state, resulting in excessively low high pressure and the air conditioning not cooling. Observe through the sight glass on top of the dryer tank. During normal operation of the air conditioning, if continuous bubbles are seen in the sight glass, it indicates insufficient refrigerant. If bubble flipping occurs, it signifies a severe shortage of refrigerant, necessitating the addition of refrigerant.
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