When your 2022 Mazda CX-5 shakes specifically when the air conditioning is turned on, the AC system is adding load to the engine that's causing vibration. This AC-specific symptom points to issues with how the engine handles the additional accessory load.
AC System Engine Load
The AC compressor requires significant engine power - often 5-15 horsepower depending on conditions. When the compressor engages, this sudden load can cause the engine to momentarily bog down before the computer compensates by increasing idle speed and adjusting fuel delivery.
Idle Compensation Failure
Modern engines automatically increase idle RPM when AC engages to maintain smooth operation. If this compensation isn't working properly - due to dirty throttle body, faulty idle air control, or software issues - the engine idles too low with AC load, causing vibration.
AC Compressor Issues
A failing AC compressor can create vibration through internal wear, bent clutch plates, or bearing failure. As the compressor engages, this internal damage translates to engine vibration. The compressor clutch should engage smoothly without clunking or causing the belt to shudder.
Motor Mount Sensitivity
Motor mounts that are marginally worn may not show problems during light loads but fail to dampen adequately when AC load is added. The additional engine effort and torque reaction overwhelms weakened mounts, transmitting vibration to the body that wasn't present before AC engagement.
Belt and Tensioner
A worn or loose serpentine belt can slip when AC load engages, causing vibration and noise. The automatic belt tensioner should maintain constant pressure, but a worn tensioner allows belt slack that becomes problematic under AC load. Belt slippage may also produce a squealing sound with AC on.
Electrical Load Compensation
AC systems also increase electrical load from the blower motor and condenser fans. Combined with compressor mechanical load, marginal alternators or charging systems may struggle, affecting overall engine operation. This is less common on a 2022 model but worth considering.