Why does the car AC button not light up or cool when pressed?
2 Answers
When the car AC button does not light up or cool, it is usually because the power fuse for the AC switch has blown, preventing the signal from reaching the vehicle's compressor, which then fails to engage the cooling function. Replacing the AC fuse located in the engine compartment's fuse box should resolve the issue. Below are some tips for AC maintenance: 1. Comprehensive AC inspection: The first time you use the AC in summer, conduct a thorough check of the system. For example, inspect the refrigerant level via the reservoir, check if the AC filter is too dirty, and look for any debris in the radiator. 2. Regular AC cleaning: It's important to replace the AC filter periodically to prevent moldy odors. Additionally, the condenser should be cleaned regularly, and for a thorough cleaning, the radiator should be removed.
I encountered this issue when driving an old car before - pressed the AC button but the light didn't come on, no cold air either, sweating like crazy. Usually it's an electrical circuit problem at play, like a blown fuse - those little things in the fuse box that cut power when burned out, causing unresponsive buttons and a dead compressor. Poor button switch contact is also common - dust buildup inside or oxidized contacts from long-term use can prevent conductivity, resulting in no light or cooling signal. Relay failures can paralyze the system too - you won't hear that familiar click sound. Deeper issues might involve the compressor or refrigerant, but the indicator light mainly depends on electrical components. My advice: first check the fuse (consult the manual for location) and replace it with a new one of the same amperage; if that doesn't work, clean the button or check for loose wiring. Best not to handle this while driving - safer to inspect when parked. If unresolved, visit a professional shop for circuit and compressor diagnostics. For maintenance, remember to inspect AC circuitry quarterly, reduce high-temperature loads, and avoid blasting max power immediately after sun exposure.
