My Weekend

[Bret]

I didn't care for bulb style adjustable thermostats so I used a CSR temp gauge. I didn't buy the installation kit because I was using a different relay. Gauge only was about $85 + shipping. Temp sender is in the intake manifold by the thermostat housing.
http://www.csr-performance.com/Merc...de=SC&Product_Code=DTG_1225&Category_Code=DTG

I ordered 2 Bosch 75A relay's from BPG for $23 each. Depending on how much current your fan draws this may be overkill. cat# 0-332-002-156
http://www.bpg-inc.com/Power.htm

I got a 100A waterproof circuit breaker from West Marine. $50 Cat# 593251
http://www.westmarine.com/webapp/wcs/stores/servlet/product/10001/-1/10001/136048/10001/119/118/9

The CSR gauge has a programmable output so you can turn it on at whatever temperature you want. It provides signal power to the Bosch relay which controls the fan. I originally got 2 relays for high and low, but ended up not using the low. I now have a spare relay. The gauge is also accurate to .5'F and is suppose to be very durable. No moving parts and such. Haven't tried it under water, but tech support advised against it. (go figure) All you need to do for manual control is put a switch in line with the signal wire.

If you want very simple use a temperature switch similar to this
http://store.summitracing.com/defau...eywordSearch&DDS=1&N=115&target=egnsearch.asp

Then ground the relay signal through temp switch. There are a couple temps available through Summit and Hypertech.

The only down side to the electric cooling fans for me is at idle my alternator doesn't quite keep up.

 

[fussy_cruiser]

so in your design you used three different relay? what amps were they rated at?
what all came in the "fan relay kit"?

where was the adjustable therm mounted ?
where was the fixed therm. mounted?

2 x 40A Lighting relays
1 x 80A relay - NAPA part# ST85

"Fan relay kit"
1 x fan relay
1 x wiring kit
1 x temp probe/switch (fixed 185 therm)

Totally not worth it, but I though I would mention

Below pic - the adj is mounted in the top circle and the fixed is mounted between the rad fins in the bottom circle. Both probes should reside above the bottom rad inlet.

 

[FJ40_owner]

Worked the first freaken time.

Only cost me:
$35 Fan - Local Pick and Pull
$60 Big Relay - ST85 - Napa
$19.95 - "Fan Relay Kit" - Advance Auto Parts
$14.95 - Extra relay - Standard 40A light relay - Advance Auto Parts
$19.99 - Adjustable temp controller and probe. - JC Whitney
$30 - Odd and ends - connectors - tape - cable management

Comes on @ 185, high kicks in @~220. Everything hooked to the battery so no key intervention ect...

Does anyone with a taurus fan notice how little these things come on? It has been cool in Colorado, but it came on 4 times on my way to work. Approx 20 minutes of some highway and lots of stop and go. I was amazed. Puts alot more in the pedal too.

I will try and post up my schematic later.

What is the width of the fan you chose to use?
Was it difficult to fab up to the radiator?

Anyone know the dimensions of the stock 40 radiator (1978)

I have an absolute maximum of four inches from the radiator fins to my water pump shaft. Do I need to worry about my engine moving forward at all, even say an eighth of an inch?

Nice mod.
Thanks,
JB

 

[bandy rooster]

thanks alot for your info on this setup its a great help.




fj40 owner.... 3 of the 4 bolt holes on the taurus line up with the ones on the 40 rad. it is fairly easy to make it fit. If you check somewhere online where you can buy a V6 tuarus radiator you should easily be able to find the aprox. dimensions.. you could probably move your radiator forward an inch or so as well.