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Engine Fan on constantly

Having a problem with cooling fan staying on constantly, C15 (formerly an accert or bridge) can anyone tell me what to check? I am trying not to just throw parts at it. Also how much could this be costing me in fuel mileage?

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Fan stays on, I do notice fan free spins for a few seconds when you shut the engine off. But the moment you start the truck the clutch re engages. Just replaced the fan clutch solenoid with OEM part, since it was the original and not overly expensive. No change in behavior, do have a wire not connected to the harness, test light shows it to be hot only when engine is running and switch is in the auto position. Can not find another wire anywhere behind the dash that corresponds with it

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Check ac high pressure switch that's usually what fails wiggle wires on switch this could show problem 04 truck shouldn't discharge ac to replace high pressure switch on line w/o fill hose

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If the high pressure switch is no good on any vehicle's a/c system it will open the switch blocking power to fan in power off fan, and ground for switch solenoid in power on fan ( ac doesnt't have to be on), high pressure switch is a closed switch until high pressure on the line opens curcuit to engage fan in power off fan and closes curcuit in power on system

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it could be your fan solenoid, located on the front top of the engine, follow backwards the air line from the fan hub to it, check your fuses and check you high pressure switch of your a/c

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Fan clutch solenoid is working properly, even with air conditioning turned off it still is on constantly. I am beginning to think it's a sensor or wire that's causing it somewhere.

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Well if fan clutch solenoid is good and with AC turned off and it still runs it must be the temp sending sensor for the fan clutch solenoid it should be on passage side of engine and normal towards the front. When I had my cat I had to change that sensor every year

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Wouldn't the sensor throw a code?

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You may have an air disengage fan clutch. To tell what kind you have, when the truck is off, can you spin the fan or not. If it doesn't spin, it is air disengage. If it spins, it's air engaged. Do you hear any air leaking? You may need to rebuild you fan clutch. If so get a kit master rebuild kit. Much better than Horton

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James will be eternally grateful.
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