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What causes one side of the car air conditioner to blow cold air while the other side doesn't?

1 Answers

MasonRose

07/30/25 3:02am

Car air conditioner blowing cold air on one side but not the other may be due to insufficient refrigerant or compressor failure, among other reasons. Here are the specific causes: Insufficient or low refrigerant: This could be caused by a minor refrigerant leak. You can observe this through the sight glass on the dryer. If continuous bubbles appear in the sight glass while the air conditioner is running normally, it indicates insufficient refrigerant. If obvious bubble flipping occurs, it indicates severe refrigerant shortage, and refrigerant should be added. Compressor drive belt looseness: If the drive belt is loose, the compressor will slip during operation, leading to reduced transmission efficiency and decreased compressor speed. This results in reduced refrigerant compression and delivery, causing the car air conditioner to stop cooling. If the compressor drive belt is too loose, it should be tightened. If it cannot be turned by hand, it means the belt is too tight and should be loosened slightly. If tightening is ineffective or the drive belt shows cracks, aging, or other damage, it should be replaced with a new one.

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