California BAR Smog Technician Practice Exam

When should the Smog Check approved fan be used?

Always Below 72 F Above 72 F Never

Correct Answer:

Above 72 F

Explanation:

The test checks when you should use the Smog Check approved fan to ensure the engine can be cooled properly during the test. It is used only when the ambient temperature is above 72°F, because hotter conditions make it harder for the cooling system to maintain stable engine temperature and prevent heat soak, which could skew emissions readings. In cooler weather, natural cooling is usually sufficient, so the fan isn’t needed; using it then could alter readings, and never using it in hot weather would risk overheating and invalid results.

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