Variable Fan speed controller 12v dc

Discussion in 'Automotive Electronics' started by Automan350, Jun 15, 2015.

  1. Automan350

    Thread Starter New Member

    Jun 15, 2015
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    Hi! I am wanting to retrofit two cooling fans into my 80s chevy truck. Issue is I really want to control the fan speed. I know these fans come from a vehicle that uses a 50 amp fuse or breaker as circuit protection. I would like to be able to use the fans at 60% and 100% of the fan speed. I figure a max of 750 watts is what they will pull. can you all help me create a speed controller? I am good at soldering and am mechanically inclined. this will be used on a 12v-14.5v system Thanks!
     
  2. Automan350

    Thread Starter New Member

    Jun 15, 2015
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    Anyone?

    I will assume all liability on me and not take anyone at fault if something goes wrong. its really a project I want to do for my family to show them you can do anything you put your mind to...
     
  3. Georacer

    Moderator

    Nov 25, 2009
    5,142
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    Hello Automan350,

    Commonly in our forum, an answer might arrive several hours later. I suggest you wait a bit, until another member takes interest in your problem.
     
  4. MaxHeadRoom

    Expert

    Jul 18, 2013
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    This may do it for you?
    Ebay 141607466889
    Max.
     
  5. Automan350

    Thread Starter New Member

    Jun 15, 2015
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    Thanks Georacer! I figured since this is a new forum this thread might not get any answers due to liability issues.
     
  6. Automan350

    Thread Starter New Member

    Jun 15, 2015
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    Hi Max. I searched ebay for that part number but didn't come up with any results. might you have the link to this? I was kind of wanting to build this but if I cant Ill just buy a unit to work with.
     
  7. Automan350

    Thread Starter New Member

    Jun 15, 2015
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    actually nevermind....

    Notice how the number shows up differently when I quote your post? Hmmm
     
  8. MaxHeadRoom

    Expert

    Jul 18, 2013
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  9. Automan350

    Thread Starter New Member

    Jun 15, 2015
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    thanks!
     
  10. Automan350

    Thread Starter New Member

    Jun 15, 2015
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  11. MaxHeadRoom

    Expert

    Jul 18, 2013
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    Looks like it should work, I assume you are controlling them together, not individually?
    Max.
     
  12. Automan350

    Thread Starter New Member

    Jun 15, 2015
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    Yes sir both together. The fans will be from a dodge charger. when they are in the charger they operate a two speeds. originally I wanted to mimic those two speeds via resistor, but I see it is not that easy. Thus I come to the forums here for help.
     
  13. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
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    I work on cars,trucks,and diesels.. What you are asking for info involves alot tech data cause of the start up rush current and normal operating current. Check out summit racing or jegs for a fan controller cause by the time you figure out how to build a proper controller the it will cost alot more in parts,time,and testing .. Also you could try using a ford turus fan controller which alot of people use and grab from junk yards..
     
  14. JoeJester

    AAC Fanatic!

    Apr 26, 2005
    3,373
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    I would have thought the PWM was controlled by a temperature sensor, so the link that automan found might not be what he needs.
     
  15. Dr.killjoy

    Well-Known Member

    Apr 28, 2013
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    No cause the max watts is 720 for 12v and for that setup it will be on the edge or over cause of the charging voltage and the rush current and operating current..You also have to watch cause sometimes those fans pull alot more current than posted..
     
  16. Automan350

    Thread Starter New Member

    Jun 15, 2015
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    Hey thanks I am mainly interested in a variable voltage controller that won't cost me an arm an leg. I have seen the ones that summit and kegs have to offer and really don't want to spend hundreds if i can make it or buy it for less. I guess what your s saying is i will need a voltage regulator ahead of this controller i am looking at?
     
  17. Automan350

    Thread Starter New Member

    Jun 15, 2015
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    I just used a calculator to figure out the wattage given they have a 50 amp fuse. Is there another way to go about this?
     
  18. Automan350

    Thread Starter New Member

    Jun 15, 2015
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    Ok do if you do the math with 50 amps and 12 volts the watts come out to 600 watts
    With 50 amps and 14 volts it comes out to 700 watts. This should be ok correct? Either way the fuse is rated for 50 amps and i highly doubt the fans will draw that or it wouldn't be safe to be mass produced and sold in to the public correct? Please correct me if I am wrong.
     
    Last edited: Jun 16, 2015
  19. #12

    Expert

    Nov 30, 2010
    16,261
    6,770
    Typo in the third line..."50 amps"

    ps, I suck at automotive. I'm just watching because I'm learning.
     
  20. Automan350

    Thread Starter New Member

    Jun 15, 2015
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    Thanks!
     
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