2010 GMC Sierra radiator fan loud and seems to run all the time 5.3 vortex

look at the oil level and color if it is choco milk color probably head gasket.is the engine noisy or fan. if fan? it is locking up because of the high heat from rad.normal. if engine possible coolant in the oil.

its coolent temp sensor for the radiator fan check it if not that a bad radiator fan relay.

Check the radiator fan to make sure it is turning at full speed. Could be a bad fan-clutch.

idle learn procedure:

turn off all electrical items (AC fan, audio, lights, defogger, etc.)
Start the engine and hold it at 3,000 rpm with no load (in park or Neutral) until the radiator fan comes on or the engine coolant gauge shows normal running temp.

Now let the engine idle for a minimum of 5 mins with no electrical loads. If the radiator fan cycles on during this time, you must add the fan running time to the 5 mins.

Have you checked fuel pressure or for a plugged catalytic converter?

If you read the label on the radiator shroud/fan cowls, you will see that it says "Warning--These fans may operate at any time, even if the ignition is off."
This means that the computer monitors the coolant temperature through the sensor in the water neck, block, or radiator, and turns the fans on if any of them reports (true or not) that the coolant is too hot.
Obviously, there is nothing wrong with the fans, because they run.
First, check your coolant level; if it's too low, then the engine actually boils the coolant in the radiator, causing it to flash over to steam, which is hotter than the thermostat is set to allow the engine to operate. Check this in the radiator itself, not the coolant bottle, with the engine of course cold at the time of your check.
You have, at the least, a false signal from one of these sensors.
You could also have a faulty fan relay in the distribution box under the hood on the driver's side of the vehicle.
You could also have a faulty ECM (hope it's not that one...$$$).
Please let me know if this helps you, and remember to vote/comment.

Heater or radiator? The radiator fan is running to cool the coolant down (since the engine isn't running, no air moves through the radiator) and extend your engine life. It's what it's supposed to do. Don't worry.

Regards,
matt

Just guessing but, I'd say either fan clutch is going bad, not turning as fast as it should be once temps go up or if you have electric fans, either fans or relays bad. I'm leaning more toward the fan clutch. The fins on the impeller of the waterpump can also wear done over time and reduce the amount of water flow.You may also want to make sure the fins in the radiator are clean and not stopping air flow. I'm assuming that when you're moving there's no problem so that should say that water pump, thermostat are doing good. Please rate this. Thanks

It sounds like you either have an condensor fan problem or low freon. The condensor fan is near the radiator. In some cases the radiator fan doubles as the condensor fan. So look there too.

does anyone know what the problem is???? 1998 GMC Sierra blower motor problem.... when fan is turned on it works fine then all of a sudden it makes a loud screeching noise and sounds like its gonna blow up, does it on all speeds. please help