Red Seal Truck and Transport Mechanic Practice Exam

Which of the following is a sign of low coolant levels in a truck?

1. Engine overheating

2. Excessive oil consumption

3. Slow acceleration

4. Improper tire alignment

The correct answer is: Engine overheating

Engine overheating is a clear sign of low coolant levels in a truck. The cooling system relies on coolant to absorb and dissipate heat generated by the engine. If the coolant level is low, the system cannot effectively regulate the engine temperature, which leads to overheating. This situation can cause severe engine damage if not addressed promptly. Low coolant can result from leaks in hoses, radiator, or engine gaskets. When the coolant level drops, there is not enough fluid to carry heat away from the engine, which causes the engine temperature to rise above normal operating levels. This can trigger warning lights or gauges on the dashboard, alerting the driver to potential engine problems. The other options relate to issues that may not necessarily be directly linked to coolant levels. For instance, excessive oil consumption may indicate problems with oil seals or piston rings, slow acceleration could be tied to fuel delivery or air intake issues, and improper tire alignment is a mechanical issue unrelated to the engine's cooling system.