What maintenance symptom would indicate a coolant system problem such as a cap failure?

What maintenance symptom would indicate a coolant system problem such as a cap failure?

• A. Noisy engine at idle
• B. Excessive fuel consumption
• C. High oil pressure
• D. Loss of coolant

Answer: (D)

A coolant system problem, such as a cap failure, will most directly show up as a loss of coolant. The cap is part of the pressurized system that keeps coolant from boiling and from escaping. If the cap isn’t sealing properly or fails to hold pressure, coolant can be pushed out into the overflow reservoir or leak from hoses, so you’ll notice the coolant level dropping over time. You might also see puddles under the vehicle, steam, or the engine overheating if the level gets too low. Other options don’t point to the coolant system specifically. A noisy engine at idle can come from many sources, not necessarily the cooling system. Excessive fuel consumption relates to engine efficiency and operating conditions, and high oil pressure concerns the oil system, not the coolant system.

A coolant system problem, such as a cap failure, will most directly show up as a loss of coolant. The cap is part of the pressurized system that keeps coolant from boiling and from escaping. If the cap isn’t sealing properly or fails to hold pressure, coolant can be pushed out into the overflow reservoir or leak from hoses, so you’ll notice the coolant level dropping over time. You might also see puddles under the vehicle, steam, or the engine overheating if the level gets too low.

Other options don’t point to the coolant system specifically. A noisy engine at idle can come from many sources, not necessarily the cooling system. Excessive fuel consumption relates to engine efficiency and operating conditions, and high oil pressure concerns the oil system, not the coolant system.