When will the Emission Inspection System prompt turning on the cooling fan?

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Multiple Choice

When will the Emission Inspection System prompt turning on the cooling fan?

Explanation:
During emission testing, it's important to keep the engine at a stable, representative temperature so the readings reflect normal operating conditions. The Emission Inspection System is set to start the cooling fan when the outside air is warm enough to require additional cooling—specifically, when the ambient temperature is 72°F or higher. This helps prevent overheating and keeps the test conditions consistent. The fan trigger in this context isn’t driven by engine idle speed, road speed, or a fixed engine temperature threshold, but by the surrounding air temperature. Hence, the cooling fan is prompted at ambient temperatures of 72°F or higher.

During emission testing, it's important to keep the engine at a stable, representative temperature so the readings reflect normal operating conditions. The Emission Inspection System is set to start the cooling fan when the outside air is warm enough to require additional cooling—specifically, when the ambient temperature is 72°F or higher. This helps prevent overheating and keeps the test conditions consistent. The fan trigger in this context isn’t driven by engine idle speed, road speed, or a fixed engine temperature threshold, but by the surrounding air temperature. Hence, the cooling fan is prompted at ambient temperatures of 72°F or higher.

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