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Well I would first ask why you would want them on. The computer grounds the fan relay when the fans are needed. They don't run until the ac is on or the engine reaches 220 degrees. Sometimes smoke in the radiator is a sign of a leaking head gasket.
The trouble code is related to a lean engine fuel trim problem. This particular code can be caused by a vacuum leak, low fuel pressure or faulty MAF or MAP. Check for vacuum leaks first, if you cant find any broken or cracked hoses, you might want to take it to a good shop and have live data read to determine if there is a component defective.
The fan should come on when the coolant temperature goes up to a certain degree that the Temperature Fan Control Switch is set at, usually 190-200 degrees. if your electric fan is not coming on when the A/C is off, than you will need to replace the Temp Fan Switch. If your radiator was recently replaced maybe the mechanic did not re-connect the wiring harness to the switch. The switch is usually located in the Cylinder Head.
most electric fan motors will spin at 200 degrees, u may need to replace the entire fan unit or the thermostat, however, its no big deal if the fans keep running (just keep ur fingers clear cuz they are supposed to run if the engine is above 200 degress even if the ignition is off)
No, it should only turn on when the temperature switch tells it to. On a hot day you may hear it running even after shutting off the engine. The fan is set up so that when you are moving at enough speed the fan shuts off to save energy, when you slow down or stop the fan should come on to maintain airflow. If you check it at this point yes it should be running. When you start it cold the fan will not turn on for maybe 10 or more seconds when the engine starts to warm up. Hope this helps.
Things to be concered about; 1.) the fan never seems to turn on. This will cause your engine to overheat when you stop. 2.) Your heat is not working. The heat going away can be a sign that you antifreeze is low and that you are about to overheat.
Most GMs use a relay package to turn on the fans. That is often controlled through a processor package. Very complicated...if yours is one of them. You will need Mitchell's manual or equal to trace this to see if you have all the signals.