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Why is there no air in the 1-3 gears of the car air conditioner but air in the 4th gear?

1 Answers

DeDylan

07/30/25 8:03am

If there is no air in the 1-3 gears of the car air conditioner but air in the 4th gear, it could be due to a faulty blower resistor. Below is an introduction to car air conditioners: 1. Air Conditioner Layout: Different types of air conditioning systems have different layout methods. Currently, most cars use an integrated heating and cooling air conditioning system. The layout involves assembling components such as the evaporator, heater core, centrifugal blower, and control mechanisms together, known as the air conditioner assembly. 2. Air Conditioner Components: Modern air conditioning systems consist of a refrigeration system, heating system, ventilation and air purification devices, and a control system. A car air conditioner generally includes components such as the compressor, electronically controlled clutch, condenser, evaporator, expansion valve, receiver-drier, piping, condenser fan, vacuum solenoid valve, idle speed controller, and control system. The car air conditioner is divided into high-pressure and low-pressure lines. The high-pressure side includes the compressor output side, high-pressure lines, condenser, receiver-drier, and liquid lines; the low-pressure side includes the evaporator, accumulator, return lines, compressor input side, and compressor oil sump.

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