* Vehicle Variability: There can be variations in the cooling system setup, including the type of thermostat and fan control system, even within the same model year.
* Sensor Sensitivity: The temperature sensor that triggers the fans may have slightly different thresholds depending on its age and condition.
* Environmental Factors: Ambient temperature, load on the engine (driving conditions), and other factors can influence the cooling system's behavior.
How to Find the Right Temperature:
1. Consult the Service Manual: The best source for this information is the service manual for your specific 1990 Nissan Maxima. It will detail the proper operating temperatures and the fan activation points.
2. Check the Temperature Gauge: Your vehicle's dashboard temperature gauge will give you an indication of the engine's temperature. If the gauge starts to climb towards the "H" (hot) zone, the fans should activate.
3. Use a Scan Tool: A scan tool can read live data from your vehicle's computer, including the engine temperature and fan activation points.
Important Note: If you're unsure about your car's cooling system, it's always best to consult a qualified mechanic. Overheating can cause serious damage to your engine.
