Toyota vellfire aircond no cold, change compressor, condenser and Flushing aircond.
After changing the compressor, condenser, and flushing the air conditioning system, the most likely reasons for a Toyota Vellfire's AC to still not blow cold air include a
refrigerant leak, a problem with the expansion valve/orifice tube, a malfunctioning blend door actuator, or an electrical fault.
Potential Issues
Refrigerant Leak: A leak is the most common reason for insufficient cooling, even after major component replacement. The system is a sealed loop, and a loss of refrigerant means the leak was not detected and repaired during the initial service. A professional should use a UV dye or electronic leak detector to find and fix any leaks, then recharge the system to the precise factory specifications.
Clogged Expansion Valve or Orifice Tube: The flushing process might not have cleared all debris, or the new components could be a different type than the original, causing issues. A clogged or faulty expansion valve/orifice tube restricts the proper flow of refrigerant to the evaporator, preventing effective cooling. This component should be inspected and replaced if necessary.
Malfunctioning Blend Door Actuator: This is a small door within the ventilation system that controls the mix of hot and cold air. If it is stuck in a position that draws air from the heater core, the system will blow warm air regardless of other component changes.
Electrical Issues: Problems with components like the AC pressure switches, relays, fuses, or the compressor clutch control circuit can prevent the system from operating correctly. If the compressor clutch is not engaging or is cycling on and off rapidly, this can indicate an electrical issue or low refrigerant level.
Insufficient Airflow: While less likely after major service, a clogged cabin air filter or a problem with the condenser/radiator cooling fans can restrict airflow and impact cooling efficiency. The fans must be running at the correct speed when the AC is on.
Contamination/Improper Oil Level: If the system was not thoroughly flushed, contaminants might have damaged the new components. Also, an incorrect amount or type of compressor oil during recharge can cause issu
A professional AC technician should perform a thorough diagnosis, checking system pressures with a manifold gauge set and inspecting electrical components and the blend door actuator to pinpoint the exact cause of the problem.
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