What are the reasons for the Honda CRV air conditioning not cooling?

[JonathanRose]

The reasons for the air conditioning not cooling are roughly as follows: 1. Insufficient refrigerant: Insufficient refrigerant causes the compressor not to work. When the refrigerant is insufficient, it will cause the air conditioning clutch to frequently engage, or even the compressor not to work. Check by bridging the low-pressure cycle switch. If it engages, it is mostly caused by refrigerant leakage. 2. Air conditioning clutch relay failure: The air conditioning clutch relay failure causes the compressor not to work. Check the condition of each terminal of the air conditioning clutch relay 14. There should be 12V voltage on terminals 30 and 85; terminal 87 should have a resistance of several ohms to ground; terminal 86 is the ground terminal provided by the PCM. After turning on the air conditioning, the resistance should be below 10Ω. Bridge terminals 30 and 87, and the clutch should engage. Otherwise, it is an air conditioning clutch relay failure (coil failure, poor coil grounding, or poor contact).