ok see if i can find something other than a factory setup.
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.
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.
... 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.
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,
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.![]()
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.
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??
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.![]()
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.![]()
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
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.