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Good morning I don't know what you are working on but possibly your ignition switch, that would explain why when you turn it off and then turn it back on it works. I don't know if this helps you or not. I know when your switch is going out you will get power to some things power not to others. I hope this helps you good luck
check for a bad thermostat or an air pocket in the cooling system...your fans should come on any time you turn on the air conditioning....check to see that both fans are coming on by doing this....trapped air is common because of the odd configuration of the cooling system...turn on all heaters and place fans on high...warm up the engine then add distilled water or dexcool to your engine coolant canister....rev a few times to pump coolant into heater cores.....good luck and be cautious when working on your engine please...
it could be a poor signal from the temperature sending unit, some vehicles have two some only one. in vehicles with two one of them runs the gauge and the other is a sender for your fuel and emissions system and triggers the fan. in either case a poor signal or intermittent signal might throw a trouble code. also it could be triggering at a wrong or low temp.
The fan works from a temp sensor on the engine. You did not give model so its just a shot. You need to check the temp sensor. Now it can also be a blown fuse, you said they appear to be ok, pull any and visual check to see if blown. The check engine light can be just coming on when the engine temps gets to high. The Chevy system uses 2 sensors.
The check engine light is supposed to come on when you turn the key to the on position. That proves to you that the light is not burned out. The check engine light then goes out within 5 seconds after the car starts. That is normal. Also the heat and air all come on when you turn the key to the on position. I don't think there is a problem there at all.
unfortunately anything could be causing your check engine light to come one. You'll actually need to have it towed to autozone or someplace like that to have the car scanned to determine what is causing the issue