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DE | I don't think my fan clutch is locking up like it should. How does this solenoid valve control the fan clutch. It has an oil line going to the valve and then one going from valve to fan clutch. It also has one wire going to it. How does this thing work and how do go about testing it? thanks.
Edited by cowhater 6/11/2017 16:57
 (fan clutch.jpg)
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 fan clutch.jpg (74KB - 75 downloads)
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Palestine, IL 62451 | Mine is air operated. Takes air for it to lock in. It is an L10 also. Or maybe air to unlock, but I do know it is air. |
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| I think on my ISM the air is used to release it. I know it's locked in place until you start the engine, then it disconnects until it gets to 200 degrees. |
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DE | Mine turns easy when not running |
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DE | Ok air line my mistake |
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West Central Indiana | I've seen them both ways. Some are air keeps them open and some air locks it closed. |
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| Unhook the line at the fan clutch and turn the key on with the system aired up and see if air starts coming out. Maybe try running it with the airline unhooked and see if the fan is engaged then. Most often, the fan is normally engaged and takes air to disengage it. Clutch could be bad if everything else seems ok. |
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Central ND | L10 should be old school air-on. About 20 yrs ago they came out with air-off fan drive so if the clutch seals failed, you still have fan capabilities, it just runs all the time. On the old ones, if the seals failed, you had to install a lockbolt to engage the fan. In the case of your L10, the solenoid should receive power when the fanstat tells the fan to engage. If the truck has a fan override switch, that would be the first place to start, however, if it's a power supply issue, the override switch may not be getting power. The right thing to do first is find the fanstat (it will be a temperature-sender looking piece with two wires screwed into the thermostat housing) and see if it is getting power when the key is on. If not, start there. If it does have power with the key, you can use a jumper wire from the alternator to the solenoid in your picture to bypass it and see if you can send air to the fan that way. If you can't get air to the fan by hotwiring the solenoid, either it's bad, or you have air issues. I mention air issues because I had an IH 2500 that had an air leak one time that affected the fan. I don't recall exactly the situation, but I had air leaking down on one side of one of the air tanks, but it wasn't being indicated by the gauges. |
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fan clutch L10 Cummins running hot
