The green temperature warning light on your dashboard in the UAE primarily signals that your engine is still warming up and has not yet reached its optimal operating temperature. It's not an immediate alarm like a red light, but ignoring it in our extreme climate can lead to premature wear. For instance, during Dubai summers with constant 45°C+ heat and prolonged AC use, repeatedly driving hard while this light is on—common in high-traffic stops on Sheikh Zayed Road—places extra stress on engine components. According to periodic vehicle inspection guidelines from RTA Dubai and technical advisories from MOI UAE, operating an engine consistently outside its ideal temperature range can accelerate oil degradation and increase long-term maintenance costs. A typical GCC-spec Toyota Land Cruiser or Nissan Patrol with a V8 engine might take 5-8 minutes of normal driving in winter to reach operating temperature, but in summer, this time can be halved. If the green light stays on for an unusually long time (e.g., over 15 minutes of mixed city driving), it could point to a faulty thermostat—a common issue in older Toyota Camrys and Nissan Sunnys used as taxis—stuck open, preventing the engine from warming up efficiently. This leads to suboptimal fuel economy, often dropping by 1-2 km/l in city traffic, and increased emissions. The most cost-effective approach is to monitor it: if normal, just drive gently until it goes off; if persistent, get the thermostat and coolant level checked at the next service, which for a common car like a Toyota Corolla in Sharjah, might cost around 250-400 AED for parts and labor.
