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Q: Check engine light on on 1995 Chevrolet Lumina APV

Afternoon again,
As I stated earier today my check engine light comes on about 15 min. into driving her & stays on this has been going on for some time now.
What I noticed just now is the cooling fan stays on & does not shut off I checked the temp. with an infrared gun & it's runing the normal temp.
Where is the switch that causes the fan to kick on?.
Thank you!
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When some codes are stored, say the engine temperature sensor code, the engine module may not know what the actual engine temperature is so it turns the fans on for safety reasons.
Do you know what codes are stored in the engine module?
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