Thermo switch do I also need thermostat

Discussion in '6th Generation 2002-2013' started by BigRocketMan, Sep 4, 2021.

  1. BigRocketMan

    BigRocketMan New Member

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    Hi all, I’m thinking of swapping over the Thermo Switch for a 85C (185F) one in preparation for my upcoming summer.
    I read somewhere that the Thermostat also needs to be changed for a lower temp rating or the Thermo Fan will run most of the time. Kind of makes sense as the stock Thermosat starts to open at 80-84C and fully open at 95C.
    Any thoughts fellow VIffers ?
     
  2. raYzerman

    raYzerman Insider

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    I'd personally leave it alone. If you feel you need the fans on, why not simply wire in a switch to the fan switch sensor.
     
  3. BigRocketMan

    BigRocketMan New Member

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    Sure, an idea. Just would prefer it to be automatic.

    104C/219F fan engagement for the stock set up seems high all considered. Japan is a hot country I'm sure the Honda engineers have got it worked out.

    I hired an 08 CBR600RR in Thailand a few years back, saw the gauge at 114C/237F !!
     
  4. Diving Pete

    Diving Pete Member

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    you are over thinking this - VFR's run hot - that's just the way it is. If you want then fitting a manual switch to turn the fan on isn't a bad idea.
     
  5. raYzerman

    raYzerman Insider

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    Coolant under pressure of the rad cap will not boil until ~265F. Temperature should not go higher with the fan on, but may if you're sitting and idling.
    One thing you can do is keep the rpms up a bit so coolant is circulating at a faster rate. Riding more than 30mph will help immensely too.
    You could also change your coolant mixture from 50-50 to say 60-40 water to coolant as water transfers heat better than ethylene glycol.. in a hot climate that may help, and I assume your freezing temperatures will never go low enough to actually freeze. Check chart on coolant jug..... if you can go 65/35 or even 70-30 for freezing temps in your area.
     
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