What causes the Toyota AC switch to blink?

[DeStella]

This may indicate the compressor protection device has tripped. The compressor overload protection trips when the system's high pressure is too high or the current is excessive due to overheating. Here are the relevant explanations: 1. Causes of high pressure or overheating: • Excessive refrigerant: Appropriately reduce the refrigerant amount. • Poor heat dissipation: Appropriately reduce the refrigerant amount. • Blockage in the pipeline system: Diagnose and resolve by referring to the pressure gauge, then reprocess the system. • Dust accumulation on the evaporator or filter, or possibly insufficient refrigerant. 2. Electrical circuit issues: • Faulty control circuit board. • Overloaded temperature sensor. • Information errors. • Loose or poor contact in power wiring. • Burnt-out start capacitor or compressor start coil.