What are the reasons for the sudden failure of the Citroen C-Quatre's air conditioning to cool?
2 Answers
The reasons for the Citroen C-Quatre's air conditioning not cooling are: 1. Damage to the piston inside the air conditioning system. 2. Damage to the clutch plate. 3. The engine ECU does not instruct the air conditioning to work. 4. The condenser fins in the air conditioning system are too dirty, causing the pressure and temperature in the system to rise too high. To protect the system, the air conditioning pump stops working, resulting in no cooling. Additional information: The cooling principle of car air conditioning is the same as that of household air conditioning. Both use the principle that R12 or R134a expands rapidly when compressed and released, absorbing a large amount of heat. In the cooling system, the low-pressure vapor of the refrigerant is sucked in by the compressor, compressed into high-pressure vapor, and then discharged to the condenser. The indoor air continuously circulates to achieve the purpose of lowering the temperature.
My Citroen C-Quatre also had its AC break down last month, driving in the scorching heat was like being steamed in a sauna. First I checked the AC compressor - after starting the engine it showed no signs of life, not even the belt was turning. Upon inspecting the fuse box, sure enough I found a blown 15A AC relay fuse. After replacing it, the compressor still wouldn't engage. The mechanic later diagnosed a faulty pressure switch using a multimeter. This component monitors refrigerant pressure and cuts power to the compressor when defective. Ended up spending 200 yuan to replace the switch, plus vacuuming and recharging the refrigerant system. I'd suggest first verifying compressor operation, then checking fuses and pressure switch before considering refrigerant replacement.
