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Question

Difficulty: EasyBasic Maintenance and Daily Checks

When checking or topping up the engine coolant level, the expansion tank cap should only be removed when the engine is cold.

Answer: Answer

Answer

True
The correct evaluation is True because vehicle cooling systems become pressurized when hot. Allowing the engine to cool down fully ensures that pressure dissipates and prevents boiling coolant and steam from spraying out when the cap is loosened.

Step-by-Step Solution

1
Identify the operational state and physical hazards of an engine cooling system.
Cooling systems operate under high pressure and reach temperatures above 90°C during vehicle operation.
Understanding system pressure and heat is necessary to determine safe maintenance protocols.
2
Determine the safety requirement for removing the coolant expansion cap.
The engine must be completely cold before opening the expansion tank so that internal pressure has fully dissipated.
Opening a hot expansion tank releases boiling fluid and steam rapidly, presenting an immediate scalding hazard.

Key Concept

Safe procedures for inspecting and topping up engine coolant reservoirs
Estimated Time:45s
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Topics

Basic Maintenance and Daily Checks

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