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Engine/Transmission (1994 - 1998) fan clutch question

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I got mine from Mopar Parts for $139 plus shipping. Mopar4less was about the same price but they didn't have one in stock. I don't think Horton makes a model to fit our trucks anymore.
 
Unless there is something totally new, there is no other solution than OE for a fan clutch.



The only other option is electrics and that is a different can of worms.



Yeah I don't want electrics. I don't tow often but when I do its heavy, in hills, and im always going way too fast.
 
I guess this will be my new project I know mag clutches exist for these engines I've seen them in fl60s I even have the vins for the 2 I saw so I guess its time I started doing research about figment and set up. Anyone here work for frieghtliner or have access to looking up a part like that on their database.
 
I guess this will be my new project I know mag clutches exist for these engines I've seen them in fl60s I even have the vins for the 2 I saw so I guess its time I started doing research about figment and set up. Anyone here work for frieghtliner or have access to looking up a part like that on their database.



Mark,

Have replied to your PM, looking forward researching this.



The first thing I am pondering is the control of the fan when the A/C is engaged. As you know the Freightliners and the 3rd gen Dodges have a high pressure switch to engage the fan as the A/C compresser head pressure rises and more air flow is needed for the condenser.



So do the stock 2nd gen trucks have an existing high pressure switch somewhere for compressor protection that could be tapped into or do they only have a low pressure cut off switch????



Alan, Vaughn, do you guys know off the top of your heads??
 
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... So do the stock 2nd gen trucks have an existing high pressure switch somewhere for compressor protection that could be tapped into or do they only have a low pressure cut off switch????



Alan, Vaughn, do you guys know off the top of your heads??



The A/C compressor power circuit includes:

  • PDC relay
  • Dashboard HVAC control
  • PCM (PCM can disable the compressor)
  • Low pressure cutoff switch (when the compressor draws more than comes out of the evaporator)
  • High pressure cutoff switch (when the compressor produces more than the condensor can cool)

In my perusals of the SM, I've never seen any other A/C sensors or switches under the hood.
 
The A/C compressor power circuit includes:

  • PDC relay
  • Dashboard HVAC control
  • PCM (PCM can disable the compressor)
  • Low pressure cutoff switch (when the compressor draws more than comes out of the evaporator)
  • High pressure cutoff switch (when the compressor produces more than the condensor can cool)

In my perusals of the SM, I've never seen any other A/C sensors or switches under the hood.



Thanks for the response, Neal.



I have to go check with my techs and see what system pressure is required to engage the electric fan control for A/C purposes, it is probably a lower pressure than the safety limit for the system.



This may not be all that bad to do, Mark has provided a few FTL vins for me so as to compare fan mountings, etc.



Mike. :)
 
I guess this will be my new project I know mag clutches exist for these engines I've seen them in fl60s I even have the vins for the 2 I saw so I guess its time I started doing research about figment and set up. Anyone here work for frieghtliner or have access to looking up a part like that on their database.



Aren't most of those air or electric? I would guess fitment is going to be the big issue but its possibble a clutch may be found to match a fan the correct size.
 
It will most likely require a fan pulley change to get the correct mounting pattern for the small Horton style clutches.

Can't mess with the fan mounting bracket as the 5. 9 sits low in the frame of an FL series truck so height will be all wrong for the fan blade I'm thinkin'...



Mark has just provided a couple of vins for me so I will make this my "end of month, keep my sanity" project..... :-laf



Mike. :)
 
Mark,

1st truck vin has a Cummins Fan Clutch, very expensive and has an odd mounting system. Price would be $750. 00 to $850. 00 bucks.

Not a contender in my opinion



2nd truck vin has potential, equipped with a Horton Fan Clutch. More common style of mount plus I like how the electrics come out the back with a support bracket.

That would be in the $500. 00 dollar range new.



Link here... . Click boxes on left for dimensions, etc.....

Horton Vehicle Products | Horton



Will dig more as I get time, gotta' close the lunch pail and go back to work.



Mike. :)
 
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Mark,

1st truck vin has a Cummins Fan Clutch, very expensive and has an odd mounting system. Price would be $750. 00 to $850. 00 bucks.

Not a contender in my opinion



2nd truck vin has potential, equipped with a Horton Fan Clutch. More common style of mount plus I like how the electrics come out the back with a support bracket.

That would be in the $500. 00 dollar range new.



Link here... . Click boxes on left for dimensions, etc.....

Horton Vehicle Products | Horton



Will dig more as I get time, gotta' close the lunch pail and go back to work.



Mike. :)



Thermal Switches are here, scroll down the page below the solenoid valves to see the thermal switches.



Horton Vehicle Products | Horton



Mike. :)
 
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Regarding Horton fan clutches, there's a couple of downsides to consider. They are "digital" in that they are either fully engaged or not engaged at all. When it engages the fan really roars, especially if you are taking off from a stop and revving the engine up, and it has noticeable drag. I really doubt you would want to set it up to be engaged all the time with the AC on. One of the NW Bombers had one on his truck he was demonstrating at a BOMB party and when he kicked it on it sounded like his truck was going to inhale everything parked within 50 feet of him. Once you are rolling down the road the AC doesn't need assistance from the fan.



I would suggest keeping the stock setup and adding a fairly low draw (maybe 200-300cfm) electric fan to kick on when the AC is turned on, which will keep air flowing in stop & go traffic and not be a HP robbing item on the highway.
 
Regarding Horton fan clutches, there's a couple of downsides to consider. They are "digital" in that they are either fully engaged or not engaged at all. When it engages the fan really roars, especially if you are taking off from a stop and revving the engine up, and it has noticeable drag. I really doubt you would want to set it up to be engaged all the time with the AC on. One of the NW Bombers had one on his truck he was demonstrating at a BOMB party and when he kicked it on it sounded like his truck was going to inhale everything parked within 50 feet of him. Once you are rolling down the road the AC doesn't need assistance from the fan.



I would suggest keeping the stock setup and adding a fairly low draw (maybe 200-300cfm) electric fan to kick on when the AC is turned on, which will keep air flowing in stop & go traffic and not be a HP robbing item on the highway.



I'm having trouble coming up with an A/C pressure switch that will work because I also would hate to see Mark have to leave it locked on at low speeds to keep the cold air coming.



Horton used to make a bunch of switches just for that purpose that would kick in at 300lbs. and kick out at 200lbs. for example but they have discontinued them as there is no demand anymore.



All that type of thing is controlled by the ECM or PCM on the trucks, the temp and pressures sensors only tell the control module what is going on nowadays.



Mike. :)
 
However, the dude in front of you at the stoplight texting would have to run home and change his shorts if your fan kicked in... ... ... ... ... ... ... :-laf



Mike. :)
 
Mark,

Have replied to your PM, looking forward researching this.



The first thing I am pondering is the control of the fan when the A/C is engaged. As you know the Freightliners and the 3rd gen Dodges have a high pressure switch to engage the fan as the A/C compresser head pressure rises and more air flow is needed for the condenser.



So do the stock 2nd gen trucks have an existing high pressure switch somewhere for compressor protection that could be tapped into or do they only have a low pressure cut off switch????



Alan, Vaughn, do you guys know off the top of your heads??



i thought about that too, and i dont think there is anything like that on the 2nd gens. what would need to be done is a switch set for the right pressure; right around 250, that could be put into the charging port. downside is it would have to be removed everytime you serviced the ac.



It will most likely require a fan pulley change to get the correct mounting pattern for the small Horton style clutches.

Can't mess with the fan mounting bracket as the 5. 9 sits low in the frame of an FL series truck so height will be all wrong for the fan blade I'm thinkin'...



Mark has just provided a couple of vins for me so I will make this my "end of month, keep my sanity" project..... :-laf



Mike. :)



i suspect it will need a different pulley, and im sure a different fan too. as far as how the engine sits in the truck i think its pretty close, but its been a long time since ive looked at an fl60



Mark,

1st truck vin has a Cummins Fan Clutch, very expensive and has an odd mounting system. Price would be $750. 00 to $850. 00 bucks.

Not a contender in my opinion



2nd truck vin has potential, equipped with a Horton Fan Clutch. More common style of mount plus I like how the electrics come out the back with a support bracket.

That would be in the $500. 00 dollar range new.



Link here... . Click boxes on left for dimensions, etc.....

Horton Vehicle Products | Horton



Will dig more as I get time, gotta' close the lunch pail and go back to work.



Mike. :)



thanks for the info so far i really appreciate it. the horton clutch is definately a contender in my mind. i havent had time to look at your link but will when i can.



Regarding Horton fan clutches, there's a couple of downsides to consider. They are "digital" in that they are either fully engaged or not engaged at all. When it engages the fan really roars, especially if you are taking off from a stop and revving the engine up, and it has noticeable drag. I really doubt you would want to set it up to be engaged all the time with the AC on. One of the NW Bombers had one on his truck he was demonstrating at a BOMB party and when he kicked it on it sounded like his truck was going to inhale everything parked within 50 feet of him. Once you are rolling down the road the AC doesn't need assistance from the fan.



I would suggest keeping the stock setup and adding a fairly low draw (maybe 200-300cfm) electric fan to kick on when the AC is turned on, which will keep air flowing in stop & go traffic and not be a HP robbing item on the highway.



your right the fan needs to be setup to engage for the ac perssure, since i dont want the fan on all the time when at low speeds with the ac on. the noise im dealing with by looking at the horton wind master revolution fan. its supposed to be very quiet when engaged and more effiecent. plus it should be able to work with just about any one of their clutches. i like the on/off of the electric and air clutches. that way i can manually engage the fan when i want, as well as having a truely free spinning fan when its not needed and engine driven, no weight restrictions, fan when i need it.



your idea of adding a electric pusher fan to the condenser when its operating might be a good idea to free up the engine fan from having to do that job.



I'm having trouble coming up with an A/C pressure switch that will work because I also would hate to see Mark have to leave it locked on at low speeds to keep the cold air coming.



Horton used to make a bunch of switches just for that purpose that would kick in at 300lbs. and kick out at 200lbs. for example but they have discontinued them as there is no demand anymore.



All that type of thing is controlled by the ECM or PCM on the trucks, the temp and pressures sensors only tell the control module what is going on nowadays.



Mike. :)



mike if i recall correctly i came across some freightliners that would kick the fan on when needed like we are talking about. i seem to remeber one such switch giving me problems in an ac diag. i forget if it was the high pressure cut out or for the fan. i think my forman told it was for the fan.
 
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also just a thought does anyone know where its possible to get a mag clutch that would fit our trucks? i dont mind switching to a different fan provided it fits if thats what is required. mag would be nice since it wouldnt spin at all untill its needed.



I called Horton back in '95 or '96 about their electromagnetic clutch fan. I could have gotten one for about $400. Everything included. I held-off. Big Mistake



Fans and Fan Drives - EC600/EC450 / Electromagnetic Fan Drives | Horton
 
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I called Horton back in '95 or '96 about their electromagnetic clutch fan. I could have gotten one for about $400. Everything included. I held-off. Big Mistake



Fans and Fan Drives - EC600/EC450 / Electromagnetic Fan Drives | Horton





What a find, Bill!!!! That is a nice all-inclusive kit. Just what Mark is looking for. I did not know that Horton had offered one.



I just found the Dodge kit install manual with part numbers, it even has a tee to handle the dual high pressure switches needed for the A/C.



Checking to see if the part numbers are still good. .



Link to manual here.

Horton Login



Mike.
 
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What a find, Bill!!!! That is a nice all-inclusive kit. Just what Mark is looking for. I did not know that Horton had offered one.



I just found the Dodge kit install manual with part numbers, it even has a tee to handle the dual high pressure switches needed for the A/C.



Checking to see if the part numbers are still good. .



Link to manual here.

Horton Login



Mike.



Fan clutch is still available as Horton Part Number 996018, threads right on to the left hand stub on the pulley. Show the fan as no longer available.

I will call Horton tomorrow to se what the story is and if there are any of the small parts left.



Mike. :)
 
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