Dual Fan SETUP what kind of switch ?

[m3f_Kyser-Soza]

i replaced my old radiator with a mishimoto and bought a mishimoto scion tc dual fan setup arrot:. i fabricated it to fit looks really good and it was cheap:shiftdriv. i was wondering if any one recomended a fan switch with a temperature switch i want to leave my auxiliary fan alone i just want to wire up my dual fans with a temperature sensor and relays of course. has anyone done this what do you recommend ?

[m3f_pbonsalb_ba5494e5cb]

Show us a picture of the Scion TC dual fan on the BMW Mishimotor radiator.


Ideally, mount the switch for the primary cooling fans in the cylinder head. TRM sells an adapter for the throttle body coolant line port if you are not using the throttle body heater anymore like many of us. But it fits only 1/8 NPT so you have to find a switch in that size. Alternatively, you can find inline switch holders for the upper radiator hose. TRM may sell those or you can buy a generic one from summit or jegs for 1.5 inch hose. You have to choose an on/off temp or spend much more for a programmable controller like Spal or Flex a Lite PWM.


If I had to choose a fixed on/off, I would choose something related to the thermostat temp. Some people use colder thermostats. I run the 80C or 176F, so I would want to let the radiator attempt to do its thing and not run the fan unnecessarily. If the radiator can keep the temp around 180, no need for the fan. Thermostats don't just pop open. The rated temp is when it starts to open. It might take 5-10 degrees to fully open. Ideally, put it in water on the stove and watch. I would want it fully open before I trigger the fan. So I would guess maybe 195 as the fan trigger and 180 as the fan off.


Any thoughts on this? I ran a primary electric fan off a colder radiator switch, but was not content. I have a lot more thermal load than most people with about 2.5 times stock horsepower. I am back to a clutch fan now, but am considering trying an electric primary again with a PWM controller and head mounted switch (which will let me experiment with on/off temps since the PWM controllers are programmable).

[m3f_M33P]

Google DCC Controller, im from the mustang community and these are EXTREMELY popular for people running electric fan setups.


edit: heres a link http://www.dccontrol.com/fancontrol.htm

[m3f_Kyser-Soza]

ok so i ended up buying a relay from radio shack and wired it up to a temp switch from an e30 they have two switches built into the radiator i picked the one with the same temp as the m3. wired it in and it works perfect. cost me $15

[m3f_Kyser-Soza]

yeah i have to figure out how to post pics i used a saab over flow tank and mounted it on the drivers side fender between the shock tower and headlight it is working great. my ac dosnt work so i disconnected the aux fan.

[m3f_Richardspe_ff9fba485e]

Why not just use the stock aux fan temp switch? Or the reduced temp switch from the FDM? Or the stock aux fan wiring? I mean, since it's already there, and it's already relay controlled?

[m3f_das borgen_362acec4fe]

Take a picture of the dual fan on the radiator for us. So if your stock aux fan is running off the switch in the radiator, where are you putting the new E30 switch?



I have attached pics of my project, now using a Mishimoto Z3 radiator with a 2.5 inch thick core but thin endtanks, and a cooling components fully shrouded 2500 cfm fan. This fan is only 2.625 inches thick including shroud. I will control it with a Dakota variable speed unit running off a head mounted sensor.



that s pretty sexy actually



source for shroud and fan?

part numbers?

or is it custom from cooling components by giving them general radiator dimensions?

[m3f_pbonsalb_ba5494e5cb]

Standard issue Mishimoto Z3 98-02 radiator (smaller side tanks, thicker core than regular E36 radiator; core is much thicker than the stock Z3 S54 radiator that I am running now). Fan is standard issue Cooling Components. It is the version that can be cut down to 17 x 21.5, and I did have to trim the sides down to 21.5 (left the top and bottom).


As for the stock or lower temp aux switch, you are free to use it if you are happy with it. I used it with a Spal puller fan for several years while supercharged and was not content with the consistency of the engagement temperatures under a variety of weather and driving conditions. For my primary cooling fan, I will use a variable speed controller running off a head or block mounted switch.

[m3f_Kyser-Soza]

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[m3f_Kyser-Soza]

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[m3f_Kyser-Soza]

ok figured that out it was easy to post pics. so i used a hole saw hack saw a file and had someone weld the tabs on to the top. i cut a slot for them then had it welded. i used a relay because my aux fan connector was faulty and these are better fans for my fan delete plus they are high powered and needed a relay. bmw always under cools their cars. the overflow tank took a long time to figure out it is off of a saab my bracket isn't the best but its been this way for a year. i would like to upgrade to an aluminum over flow tank i would just make the dimensions similar to the saab tank and the tank is a dual chamber tank so it works great. only thing i would have done different is i would have used a fiber wheel fro my grinder instead of a hacksaw. warning using a normal grinding disk on aluminum can make the disk explode so make sure you use a fiber one or just use the hacksaw. :greenchai

[m3f_pbonsalb_ba5494e5cb]

Looks like it will get the job done. I like the high mount overflow tank. That really helps with bleeding the system and frees up some space on the side of the radiator. Other BMWs put a high mount tank on the strut towers and I think that is a great location if you have the space (removed stock airbox or relocated washer fluid reservoir). I am using the Euro tank that locates near the ECU, but you have to remove or relocate the secondary air pump to run that on 96-99 cars.

[m3f_Kyser-Soza]

yeah i didn't want to move my air pump but i think i found the euro bottle on something else lie a 90s e30 318i but i could be wrong. i did find the same euro bottle on something just cant remember for sure if it was on a bmw. the plus side to using the scion tc dual fan is they are cheaper. i picked it up for $60 brand new i got a deal on the welding so for anyone else that wants to try this just make sure you can find some one to weld aluminum at a good price or if you can then your set. :thumbsup2: