Why is the cold air from a diesel car's air conditioner not cold?
2 Answers
The reasons why the cold air from a diesel car's air conditioner is not cold are as follows: 1. Too much refrigerant: This leads to a decrease in cooling efficiency. 2. Too little refrigerant: Insufficient refrigerant causes the condenser to become dirty, and a loose compressor drive belt can also result in the air conditioner not cooling properly. 3. Excessive impurities: If there are too many impurities in the refrigerant and the refrigeration oil, minor blockages can occur, leading to insufficient cooling capacity. If there is excessive dirt in the refrigerant and refrigeration oil throughout the entire air conditioning system, it will inevitably clog the filter screen of the filter, reducing the cooling passage capacity and increasing resistance. This also means less refrigerant flows to the expansion valve, resulting in insufficient cooling capacity.
Oh, after driving diesel vehicles for so many years, I've seen plenty of issues with the A/C blowing warm air. The most common is insufficient refrigerant, possibly due to a small leak that wasn't noticed in time; the compressor not working properly—listen for unusual noises when the engine starts; fan failure or a blown fuse causing poor heat dissipation; the A/C filter being clogged with dust, reducing airflow; or a faulty thermostat giving inaccurate temperature settings. Last time I encountered this, it was the filter—cleaning it fixed the issue immediately. I recommend first checking the refrigerant level—if it's low, top it up with R134a, but don't mess with the pressure yourself; if the compressor makes strange noises, it's best to take it straight to a mechanic; maintain it regularly, replace the filter annually, and check everything before summer to avoid misery on the road. Diesel engines put more strain on the A/C system, making it age faster—paying attention to it can save you hassle and money.
