* Engine Condition: A poorly maintained engine might run hotter or colder than ideal.
* Coolant Level: Low coolant will lead to overheating.
* Coolant Condition: Old or contaminated coolant is less effective.
* Ambient Temperature: Extreme heat will cause the engine to run hotter.
* Driving Conditions: Idling or heavy towing can impact temperature.
* Thermostat: A faulty thermostat (stuck open or closed) will greatly affect operating temperature.
* Radiator: A clogged radiator will cause overheating.
* Water Pump: A failing water pump will impede coolant flow.
The gauge in the 1991 Jeep Wrangler provides an approximation, and the actual temperature should ideally be checked with a more accurate thermometer. If the temperature consistently runs outside the normal range, professional diagnosis is needed to identify the cause.
