A few stupid questions re: thermostat switch for electric fan

[Eddo Rogue]

Gonna try again to swap in this efan...this time using a non adjustable switch.

I would like advice on what temp range to use, and where to install my thermo switch.
If temp range depends on thermostat, I'd like the ranges for both a 180 and 195 thermostat.
I have hose adapters to run the fitting in the upper or lower radiator hose, or heater hose, would like ideas on where to start first, and hopefully last.

BTW Its a '93 4.0 OHV 5 spd manual w/ the thin core radiator if that matters. Also I have no cooling issues at the moment (just about everything's been replaced)

The temp ranges confuse me a bit. for example if the temp range is 200 on and 185 off, and I have a 195 thermostat, wouldn't the fan always be on? Or does the location difference affect the temps enough to where the range needs to overlap in order not to? Or do I need a higher temp range w/ the hotter thermstat?

 

[Elutheros]

I used a BMW switch mounted in the outlet from the engine to the radiator. It has two temp. ranges. You could just cut the hose and mount a metal pipe with the switch threaded into it. The BMW switch works great with my Volvo fan. I'm using the double core 4.0 radiator with my 5.0 V8 and here in TX even on 100+ days I've never had an issue with overheating. I think there is some information in the tech articles on using the BMW switch.

 

[RonD]

If using a "200 on and 185 off" use it on the upper hose closer to rad than engine
And be sure to mount it side ways or on the bottom so it stays covered in coolant, top side mount can get uncovered if you get air in the system

It will be on as needed, if thermostat is only open a bit then coolant at the temp switch may be under 185deg, if its over 185 then you need the extra cooling

While I would prefer using the temp switch as a ground you can use it for the 12v activation of the fan relay and also hook up the 12v AC trigger, with a diode, to turn on fan relay

 

[Eddo Rogue]

I used a BMW switch mounted in the outlet from the engine to the radiator. It has two temp. ranges. You could just cut the hose and mount a metal pipe with the switch threaded into it. The BMW switch works great with my Volvo fan. I'm using the double core 4.0 radiator with my 5.0 V8 and here in TX even on 100+ days I've never had an issue with overheating. I think there is some information in the tech articles on using the BMW switch.

I had to switch to the thinner radiator for my fan to fit. Its an FFD dynamics. I tried a flex a lite slim fan, but it still wouldnt clear w/ the big radiator. Yea I been doing a of reading, trying to determine my approach angle to this. Good stuff, sounds like a solid setup, thanks.

 

[Eddo Rogue]

If using a "200 on and 185 off" use it on the upper hose closer to rad than engine
And be sure to mount it side ways or on the bottom so it stays covered in coolant, top side mount can get uncovered if you get air in the system

It will be on as needed, if thermostat is only open a bit then coolant at the temp switch may be under 185deg, if its over 185 then you need the extra cooling

While I would prefer using the temp switch as a ground you can use it for the 12v activation of the fan relay and also hook up the 12v AC trigger, with a diode, to turn on fan relay

Sounds good, I was thinking go upper hose for the sensor, theres a nice straight section I can splice into, and run wires cleanly from.
I plan to connect it to ac trigger using diode/relay. Based on what I learned from replies to my other posts.

I switched to a 195 thermostat not too long ago and the temp gauge stays in the middle, or slightly above. I am running stock clutch fan for now. good info on the side or bottom mount, I will be sure to mind that.