What is the reason for no air from the rear air conditioning in a Lexus?
2 Answers
If there is no air from the rear air vents, it may be due to a valve malfunction. If the exhaust valve is open but no air is coming out, it is highly likely that the valve is faulty. Another possibility is leakage at the connection between the evaporator case and the air duct. Additionally, a dirty or clogged air filter in the car's air conditioning system can block the air vents. When a car is driven for long periods in poor air quality, the air filter is more prone to becoming clogged with debris. Tips for maintaining car air conditioning: 1. Do not randomly adjust the direction of the air conditioning vents: When using the air conditioning, not paying attention to the direction of the airflow can reduce its effectiveness. According to the principle that cold air sinks and hot air rises, the correct approach is to direct the vents upward when using the air conditioning for cooling and downward when using it for heating. 2. Regularly start the air conditioning in winter: In regions with milder winters, some car owners may not use the air conditioning at all during the winter. Prolonged disuse can cause the rubber seals to age and the lubricants on internal components to dry out. Starting the air conditioning periodically allows the components to be lubricated and maintains their good condition. Therefore, it is advisable to start the air conditioning at least once a week during winter.
The issue of no airflow from the rear air conditioning vents is quite common in Lexus models. From my experience in car repairs, I've observed several main causes: damaged fan motor, clogged or leaking ducts, malfunctioning rear control switch, stuck or closed vent flaps, or faulty temperature sensors. Any of these can disrupt air delivery. Fan failures often result from dust accumulation or aging; duct issues stem from small debris or broken seals; switch malfunctions are usually due to contact corrosion; and accidentally closed flaps are a common human oversight. If there's no airflow from the rear vents upon startup, try adjusting the airflow using the front panel or rear buttons. Additionally, a blown fuse could also be the culprit. While it may seem minor, this issue shouldn't be ignored as it affects cabin comfort. It's advisable to address it promptly—either by checking the settings yourself or visiting a professional workshop for diagnosis.
