Originally Posted by Don-T
Actually that makes sense. If the switch is set to 185 and the thermostat is set to 195 then the fan will never shut off. Probably would be better to have a switch that turns off at 195 and on at 200. One problem with that though is that they are not that exact, switches can vary by 5-10 degrees.
Having said all that it still comes back to what seems like the better option of measuring the radiator temp. I am seriously tempted to braze a bung in the radiator for a sensor there.
As I mentioned originally I am going to wire up with a manual switch for now and get a feel for how often the fan needs to come on before I do anything with a sensor. After that my plan is to use a thre position switch on-off-on. First position to auto operation, then off, then manual high speed.
I have the Hayden "fin" type probe. I don't know where I should put it. I have an aftermarket radiator and the fins seem too close together to shove the little Ziptie thing they sent with it through there. I have heard about people just JB welding it to the radiator. That might be a little permanent for me (don't want to have to buy a new radiator if there is a problem. I have also heard about people putting the probe inside the top radiator hose. I kind of like that one but am concerned about it leaking or the probe lead getting damaged. What methods have you guys all used? And how well have they worked?
I did all the current measurements and posted them a while back. If you are doing the Tarus fan I would go with the Hayden controller(Cheap but funtional) because it is capable of dealing with the slow speed current from the fan. Wire it uop as designed. The conroller does have a high side for the AC you can use it to control a higher current relay or in my case I used a solid state relay that is stiched. The inrush is very high in the high speed but the amount of air that fan can move is nothing short of incredible and overkill for 99% of what you do with your Jeep. My .02
I have the controller and it will be actuating a higher amp relay, I think I have all that under control. I just don't know the best way to attach the probe to the radiator or in the top hose. I would like to know how other people have mounted it. I like the idea of putting it in the top hose I'm just wanting to know if anyone has had any trouble with leaking or damaging the lead off the probe. Oh yeah, the controller has two terminals, that aren't labeled. does it matter? Or does anyone know which one should go to ground and which one should go to the relay?
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