2018 Mazda CX-9

Engine complaints dominate what 2018 CX-9 owners report, with cooling system failures being the most consistent thread. Owners frequently describe overheating events tied to radiator failure, often with little or no dashboard warning before significant damage occurs, several report coolant entering the engine and causing what they characterize as catastrophic internal damage. A recurring detail is the absence of a timely warning light, leaving drivers unaware until white smoke appeared or the vehicle was already disabled. Some owners specifically report cracked cylinder heads, cracked exhaust manifolds, and turbocharger damage on engines with mileage in the 80,000–130,000 range. Powertrain complaints are a distant second, and electrical reports include a liftgate that opens on its own and creates a parasitic battery drain. The cooling-system-to-engine-damage sequence is the clearest pattern across multiple independent reports.