What Causes Fluctuating Car Engine Temperature?

[WalkerRose]

Fluctuating engine temperature in a vehicle is usually caused by wiring faults or sensor abnormalities. Related fault descriptions are as follows: Introduction to wiring issues: Primarily involves grounding problems. Poor grounding, insufficient grounding points, or accidental grounding of wires can all lead to unstable engine temperature. First, check the vehicle's grounding points for firmness and signs of rust. Then inspect the instrument cluster's grounding points for looseness or corrosion. Reasons for fluctuating engine temperature: Sudden temperature fluctuations while driving may be caused by system failures, specifically sensor abnormalities. Sensor issues typically stem from quality defects or temporary malfunctions. In such cases, performing a battery reset for initialization can help determine if the fault persists.