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Thread: Hard wiring Thermofans

  1. #1
    Junior Member Grease Monkey
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    Default Hard wiring Thermofans

    I know thermos have been dicussed in depth, inc wiring. What I'm wondering is why should I bother with a switch? Why can't I just have them run all the time? I think I would prefer to know they run all the time...

  2. #2
    Junior Member Grease Monkey
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    Default Re: Hard wiring Thermofans

    So that you allow the engine to get up to operating temp.
    MX83 Grande 1jz GT35R buildup here.
    http://www.toymods.net/forums/showth...ghlight=grande
    Some say that his heart has 6 cylinders. All we know, is he's called,

  3. #3
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    Default Re: Hard wiring Thermofans

    but the thermostat is still there, how will it be different from running the clutchfan?

  4. #4
    Toymods Net Nazi Too Much Toyota river's Avatar
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    Default Re: Hard wiring Thermofans

    Hi,

    The clutch fan (I assume you mean viscous coupled) comes on when hot and backs off when not, so it is not on all the time.

    Having it on all the time just means that you increase wear on the electric fan, plus all the time it is operating it pulls power from your battery, which means your alternator is going to have to deliver more energy to keep the battery charged, which means more load on your engine to keep the alternator charging at a higher level.

    Nothing technically wrong with it, but sort of wasteful on energy.

    Why don't you leave your headlights on all the time too?

    seeyzuz
    river
    The thinking man's clown and the drinking woman's sex symbol
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  5. #5
    Junior Member Grease Monkey
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    Default Re: Hard wiring Thermofans

    Just looking for a cheap temporary solution till I get some money to do it properly...

    But you made me think...

    Maybe I can wire them up too my head lights and when the car starts overheating I'll just flick the lights on...

  6. #6
    Toymods V8 Member Too Much Toyota CrUZida's Avatar
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    Default Re: Hard wiring Thermofans

    Or just spend the $50 on a proper switch???

    Running them all the time will use more fuel and sap power (ignoring all the other reasons why not to do it).
    Peewee
    1985 MZ12 Soarer - 1UZ Powered
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  7. #7
    Forum Member Grease Monkey
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    Default Re: Hard wiring Thermofans

    Quote Originally Posted by 88MKIII 1G-GTE View Post
    Maybe I can wire them up too my head lights and when the car starts overheating I'll just flick the lights on...
    or wire them to your neutral switch.. when the car overheats, put your gear into neutral and have a beer somewhere. i hope you're kidding

    wiring to head lights is only 0.01% easier than proper manual switch. of course the best way is to use the thermoswitch.

    but as for hardwiring the fan, i don't see any harm as far as electrical load goes. if you see the charge light comes on often then you know your alternator is not up to the job.

    the only downside i see is you'll wear out the carbon brush on the fan motor much quicker and longer time to reach operating temps upon cold starts. correct me if incorrect?

    **edit**

    yes fuel consumption should suffer also from hardwiring but how significant is it as long as it's just a temporary solution?

  8. #8
    Junior Member Grease Monkey
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    Default Re: Hard wiring Thermofans

    Yes that was a joke.

    Can I really get what I need to do it for $50? I doubt so...

    Thermoswitch, relays, wire, fuse....

    I think I'll wire it direct to battery with some clips to I can just disconnect when I get out. Will only be like that for a couple of weeks

  9. #9
    Toymods Club Member Conversion King big_zop's Avatar
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    Default Re: Hard wiring Thermofans

    Mate, you should be posting in this thread if you are going to do that - http://www.toymods.org.au/forums/showthread.php?t=11264

  10. #10
    Toymods Net Nazi Too Much Toyota river's Avatar
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    Default Re: Hard wiring Thermofans

    Hi,

    Just put a switch in the cabin to turn the fan on and off manually as required, but you'll need to keep an eye on the temp gauge so you dont cook your engine.

    It's a crude extemporisation, but workable for the short term.

    seeyuzz
    river
    The thinking man's clown and the drinking woman's sex symbol
    RA25GT - There is no substitute | 18R-G - Toyota's Dependable Masterpiece
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  11. #11
    Junior Member Grease Monkey TRD-12A's Avatar
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    Default Re: Hard wiring Thermofans

    agreed with the switch TEMPORARILY but in saying that if you dont run a relay anyway and you leave the fans on for too long youll burn out the switch either way you look at it if its not done properly its only gone last a short period of time as for dodgy things they defanitely are temporary you know like to just get home or to get to 1 place wouldnt recomend it if your driving it a fair bit plus you robably could buy everytyhing for round $50 you just got to go the right place

  12. #12
    Blasphemist Chief Engine Builder Bananaman's Avatar
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    Default Re: Hard wiring Thermofans

    Switch doesn't work for me - i always forget. Previous owner did mine that way, and it was a pain in the ass - i just left on all the time instead to save forgetting. Now i've reqired it properly its great to know i don't have to think about it. If you are going to do it dodgy, at least use a relay so that it only comes on with ignition?

    If you want to be tight the get secondhand themo switch and relays from a wreckers? Cable costs SFA.
    KE20 CA18DET / RN25 12R / IS200 1G / NA MX5 B6

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