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    rad fan switch sensor
    #1
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    Where cen I get a fan switch sensor for my civic rad
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    Re: rad fan switch sensor
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    Super Moderator minibajaman's Avatar
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    I am using this one from Summit:

    Derale Cooling Products 16749 - Derale Performance Deluxe Adjustable Controllers with Pipe Threaded Probes - Overview - SummitRacing.com

    Works well and is adjustable which is important for snowmobile engines since they don't run as hot as automotive and bike engines.

    I have the sensor installed where the pressure cap on the engine goes.
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    Re: rad fan switch sensor
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    Thanks, thats exactly what I want and thats what I want to use it for is a sled engine.
    Could you explain a bit better as to where you have it installed.
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    Re: rad fan switch sensor
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    Super Moderator minibajaman's Avatar
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    Quote Originally Posted by Stomper View Post
    Could you explain a bit better as to where you have it installed.
    On the engine I used there was a coolant pressure/fill cap on top of the head. Since the radiator was now the highest point and has it's own cap, I machined a cover plate with a tapped hole in the center for the sending unit. The last pic is an older version before I put the sending unit there.
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    Re: rad fan switch sensor
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    Cool, thanks minibajaman. I understand now.
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    Re: rad fan switch sensor
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    Super Moderator minibajaman's Avatar
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    I can no longer recommend using the adjustable fan controller. It has a circuit board inside and is prone to failure. I just had mine fail for the second time this weekend.

    I am thinking about just using a fixed temp switch from now on. They have ones that turn the fan on at either 180 F or 190 F, either of which would be fine. I think the temp warning light on the sled is 205 F. Probably the 180 on and 165 off would be best, as that is pretty much the range I am using now which seems to work well.

    Premium version with relay for up to 25 amps

    Super simple switch version, max 15 amps
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    Re: rad fan switch sensor
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    I ran their 190 degree unit on a car and it worked great but I think it turned on a bit hotter then the 190 advertised. Also I would run the two wire verson.
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    Re: rad fan switch sensor
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    What temperature would a sled engine run at in the summer. Would the simple switch work for a sled engine.
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    Re: rad fan switch sensor
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    Super Moderator minibajaman's Avatar
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    Quote Originally Posted by MC@ Performance Fab View Post
    I ran their 190 degree unit on a car and it worked great but I think it turned on a bit hotter then the 190 advertised. Also I would run the two wire verson.
    Ok, that confirms that I will stick with the 180 degree version. By two wire version, do you mean the simple one or the relay one?

    Quote Originally Posted by Stomper View Post
    What temperature would a sled engine run at in the summer. Would the simple switch work for a sled engine.
    I have been running my sled engine around 175 deg F with no issues. As I said earlier over 200 is too hot. The simple switch vs. relay switch depends on your fan and how much current it draws.
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    Re: rad fan switch sensor
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    Good point about the current draw. I never thought about that.
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