Question

12 ) an engine overheats after a few minutes of driving. which of these could be the cause?
a. a stuck - closed thermostat
b. a plugged heater core
c. a seized fan clutch
d. a failed radiator pressure cap
copyright © the national institute for automotive service excellence (ase) © 2025 - all rights reserved.
review test 12 of 40 questions

Explanation:

To determine the cause of engine overheating, we analyze each option:

• Option A: A stuck - closed thermostat prevents coolant from flowing through the radiator, causing rapid overheating as the engine can't be cooled properly.
• Option B: A plugged heater core affects cabin heating, not engine cooling enough to cause rapid overheating.
• Option C: A seized fan clutch impacts cooling at low speeds, but not as quickly as a stuck thermostat.
• Option D: A failed radiator pressure cap causes coolant loss over time, not rapid overheating in minutes.

So, a stuck - closed thermostat is the most likely cause.

Answer:

A. A stuck - closed thermostat