What is the reason for the automatic shutdown of the Alphard's AC switch?
2 Answers
The reasons for the automatic shutdown of the Alphard's AC switch: 1. Poor contact between the air conditioning line pins and sockets; 2. Blockage in the air conditioning system. The Alphard's body dimensions are 4975mm in length, 1850mm in width, and 1945mm in height, with a wheelbase of 3000mm. It features a front-engine, four-wheel-drive layout, with a MacPherson independent suspension at the front and a double-wishbone independent suspension at the rear. The Alphard is equipped with a 2.5L naturally aspirated engine, paired with an e-CVT continuously variable transmission. This engine delivers a maximum power of 86kW and a maximum torque of 198Nm. The engine also incorporates hybrid injection technology and uses an aluminum alloy cylinder head and block.
I've been driving an Alphard for many years and have encountered the AC automatically shutting off a few times. It's probably an issue with the air conditioning control module, where the computer misjudges and turns off the AC. It could also be a blown fuse—when the current overloads, it breaks to protect the system, causing the AC to stop working. If the temperature sensor is inaccurate, it might mistakenly think the temperature has reached the set level and shut off. Sometimes, it's due to poor wiring contact or a short circuit, which is more common on bumpy roads. If you're trying to fix it yourself, I recommend first checking the AC fuse in the fuse box and replacing it with a new one. If that doesn’t work, it’s best to take it to a repair shop and have them scan for error codes with a diagnostic tool. For safety, avoid disassembling the dashboard yourself to prevent making a short circuit worse. Unstable battery voltage could also be a factor—regular maintenance can help prevent this issue. Pay attention to any unusual sounds when the AC is running; a humming noise might indicate the compressor is failing.
