What Causes the Buick Excelle to Spray Water?
1 Answers
Detailed explanations are as follows: I. Water spray caused by poor water flow: 1. Fault causes: Radiator core tube blockage; Inner layer detachment or excessive softness/collapse of the water pump inlet hose. 2. Fault diagnosis: When water flow is obstructed at the pump inlet section (i.e., radiator lower tank), sudden throttle increase rapidly raises pump speed and water output. If the coolant in the lower tank cannot return promptly, water level rises in the upper tank, increasing pressure and causing water to spray from the radiator filler neck. 3. Characteristics: Each sudden throttle application triggers one spray episode; Maintaining high engine speed without sudden throttle may elevate water level but typically prevents spraying. II. Water spray caused by overheating: 1. Fault causes: Excessive scale buildup in water jackets; Reversed fan blade installation or belt slippage; Damaged/inoperative pump impeller; Overly retarded fuel injection/ignition timing; Poor coolant circulation; Prolonged engine overload operation. 2. Fault diagnosis: When engine overheating occurs, coolant boils and sprays from the radiator filler neck. 3. Characteristics: No spraying during cold starts; Spray occurs during hot operation; Spray intensity increases with higher temperatures; Engine speed variation shows no significant impact on spraying behavior.
