What are the reasons for high water temperature when the air conditioning is turned on in a Nissan Sylphy?

1 Answers
VonHailey
07/30/25 7:23am
Nissan Sylphy may experience high water temperature when the air conditioning is turned on due to issues with sensor feedback values. Below are the specific reasons and solutions: Problems with sensor values: Poor grounding between the engine and the vehicle frame can cause inaccurate feedback from the water temperature sensor, leading to false readings on the water temperature gauge. The symptoms include a rapid rise in water temperature after starting the car, regardless of whether the engine is cold or hot, with the issue being most noticeable when turning on the headlights or blower. Alternatively, the water temperature may drop immediately after turning off the headlights and blower. Recommended solution: It is advisable to have a professional electrician inspect the issue or attempt a DIY fix. For a DIY solution, simply run two grounding wires from the negative terminal of the battery to the engine and the vehicle frame to resolve the issue.
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