Note: A vapor cloud or hissing sound near the filter indicates a leak.
The cooling system plays an important role in overall engine performance by keeping the engine within the normal operating temperature range - hot enough for efficient combustion, and cool enough to prevent engine damage from overheating. Good preventive maintenance practices, along with monitoring cooling system performance, go a long way in preventing engine damage that could result from cooling system problems. The maintenance items and tests outlined in this section should be performed at the intervals
Radiator Pressure Cap
Source: MaintainX (Community Member)