What Causes the Air Conditioning in Diesel Vehicles to Not Blow Cold Air?

1 Answers
DePaige
07/29/25 8:30pm
Diesel vehicle air conditioning not blowing cold air may be due to refrigerant issues. Here are the specific details: 1. Excessive Refrigerant: This is usually caused by overcharging the refrigerant during maintenance, as the proportion of refrigerant in the air conditioning system must meet certain requirements. If the proportion is too large, it can affect heat dissipation. If too much refrigerant is added during maintenance, the cooling system's heat dissipation capacity will also decrease. 2. Insufficient Refrigerant: The main reason for insufficient refrigerant is minor leaks in the system. If there is not enough refrigerant in the air conditioning system, the amount of refrigerant sprayed into the evaporator from the expansion valve decreases, leading to less refrigerant evaporating in the evaporator. The amount of heat absorbed will also decrease, resulting in reduced cooling capacity.
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