No Heating at All [08/2023 - ]: Description
WARNING: This page is about a different car, the 2025 Lexus RX 450h+ and 2024 Lexus RX 450h+. However, it is still accessible from the selected car via links, so may be relevant.
If cool air blows from the registers regardless of the temperature setting of the air conditioning system, the following factors may be the cause.
| Malfunction Status |
Factor |
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- Refrigerant pressure
- Cooling electric expansion valve (cooler expansion valve)
- Heating electric expansion valve (No. 2 cooler expansion valve)
- Low pressure magnetic valve (No. 1 magnet valve assembly)
- Evaporator front magnetic valve (No. 2 magnet valve assembly)
- High pressure magnetic valve (No. 3 magnet valve assembly)
- Air conditioning coolant temperature sensor (engine coolant temperature sensor)
- Flow shutting valve
- Servo motor
- Damper and damper link
- Warm-up control
- Heater radiator unit sub-assembly
- High voltage electric heater (electric heater sub-assembly)
- Heating three-way valve (heater water valve assembly)
- Electric water pump (heater pump assembly)
- Water cooling condenser refrigerant temperature sensor (No. 2 air conditioning thermistor assembly)
- External condenser refrigerant temperature sensor (thermostat assembly)
- Evaporator refrigerant temperature sensor (No. 4 air conditioning thermistor assembly)
- Evaporator temp. sensor (No. 1 cooler thermistor)
- Air conditioning pressure sensor
- Heat pump ECU assembly
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