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Old 11-28-2006, 04:28 AM
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Default 1998 Freightliner FLD120 ***PROBLEMS***

Does anyone have any suggestions on why my fan won't shut off....???

It cools my engine right down to less than a 100 F

Thx Mike
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Old 11-28-2006, 05:04 AM
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Is this a new problem?

If it has "always" done this since you have had the truck check to see if someone has run a jumper wire at the fan.

If it is something "new" then check the switch on the dash.

If that isn't it then it is probably a bad temp sensor.
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Old 11-28-2006, 05:11 AM
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"down" to 100? There's no way your engine should be able to cool itself off that much.
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Old 11-28-2006, 06:47 AM
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Quote:
"down" to 100? There's no way your engine should be able to cool itself off that much.
It could if the thermostat is bad as well. Nothing like a bad thermostat to make a long drive on a cold day/night a living hell.
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Old 11-28-2006, 02:58 PM
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Most fans are controlled by air to turn them on and off. There is a internal gasket that could be bad. There are fan hub kits to fix this problem, just make sure the hub is put back on straight. The kit is in the 200 range and a new one is in the 500-600 ranges. That bad gasket is the most common problem with a easy fix.
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Old 11-29-2006, 02:56 AM
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I live in calgary alberta...the temp outside right now is -25 C. I tried changing the the EDM under the dash as well as changed the sulanoid for the fan still nothing...So i took it one step futher, on the EDM there is a wire labelled (Fan Control). I spliced into it and hooked a two way switch up to the wire and grounded it. works great but still not fixed anymore ideas???

thx for the idead btinc
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  #7  
Old 11-29-2006, 06:24 AM
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As for the engine temp. If you have a Detroit, the thermostats go bad on a regular basis. Change both, and use new seals.

The fan is probably a Horton. The Horton fan switch go bad on a regular basis also. It is either screwed into the fan shaft behind the pulley, and if not, follow the air line back until you come to a connector that has an electrical wire to it.


This is the Horton fan control. Change it if you haven't. I have seen them go bad at the rate of two a year, while some will last for several years.
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Old 11-30-2006, 12:37 AM
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I don't know about your fan clutch, but mine works by applying air to the clutch to disengage the fan. With the engine off and air up, remove the air line to the cluch, apply 12v to the solinoid by use of a jumper. If that works, try using the trucks 12v, key on, not running. If that works okay, reattach the air, apply 12v, (do not start engine), and smack the fan clutch hub with a hammer, and see if the fan rotates freely. If air goes where it supposed to, you're good to the clutch. If it won't break loose, rebuild or replace the clutch assy.

You get all that??? (mine likes to stick if it's been sitting for awhile)
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  #9  
Old 11-30-2006, 04:20 AM
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I did mr pearsons thx. Ive tried everything except change the thermostat and rewire the whole thing. If its not the thermostat m guessing its grounding out somewere. For now, the switch i put in works great but ill have to fix it b4 summer as its not working right. Im gonna try the thermostat this weekend and see if that does it. I dont think its the fan hub because i can't hear any leaks with the truck off. I had it in the shop this week and it cost me 500 bucks only to find out it still wasn't fixed.. Thx for all the ideas, pls keep em' comin
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Old 11-30-2006, 04:23 AM
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Thx for the help people
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