Red Seal Automotive Service Technician Complete Practice Exam 2025

Question: 1 / 400

Which of the following issues can indicate a faulty thermostat?

Low tire pressure

Fluctuating temperature gauge readings

A faulty thermostat can lead to fluctuating temperature gauge readings because it is responsible for regulating the flow of coolant in the engine. If the thermostat is stuck open, the engine may run cooler than normal, causing the temperature gauge to read lower temperatures. Conversely, if the thermostat is stuck closed, the engine can overheat, leading to higher temperature readings. These malfunctions cause instability in the temperature gauge, which reflects the changes in coolant flow and engine temperature.

The other options do not directly relate to the function of a thermostat. Low tire pressure pertains to tire maintenance, flickering dashboard lights may indicate electrical issues or low battery voltage, and excessive oil consumption suggests problems with engine seals or wear. Therefore, only fluctuating temperature gauge readings are a direct result of a malfunctioning thermostat.

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Flickering dashboard lights

Excessive oil consumption

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