Well, maybe the switch is working, but the fan ain’t coming on. When I flip the switch to “on“, I hear air coming from a small valve towards the top rear on engine(DDECII). What’s going on?
‘89 W900B manual fan switch not working
Discussion in 'Heavy Duty Diesel Truck Mechanics Forum' started by mile marker 27, Jun 24, 2021.
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I’m not sure about your particular truck
But usually the fan uses air pressure to turn it off and lack of air to turn it on, just like the parking brakes.mile marker 27 Thanks this. -
You’ve got a broken/leaky air line or solenoid. Charge up the air system, shut the engine off, turn the key back on and turn the fan switch on, locate the air leak, fix it and then retest.
mile marker 27 Thanks this. -
Last edited: Jun 27, 2021
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Probabaly just has trash in itmile marker 27 and Roberts450 Thank this. -
What’s the minimum psi, that the fan clutch can be engaged? What coolant temperature does the electric fan engage?
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The fan will most likely auto lock on around 100-90psi as they normally take air to unlock them and with the Detroit Id venture to so the ecm will probably turn it on around 200-210 but not sure.
mile marker 27 Thanks this.
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