I am in the process of converting my SC3 to IS300 e-fans, but have one question. I am wanting to use 2 radiator temp switches to control the fans for example, one at to close at 160 and the other to close at 190 degrees but I am unsure of a part number for these switches. I took the schematic that Gerb posted several years ago to make my wiring harness, but need this last piece of info.
I went up to autozone (should have known better) and asked the guy working the counter if he could help with this question and was told that he would need a part number to do so.
Thank You
Scott

 

2 suggestions if you have not considered.. you will need to change your alternator to at least a 170amp as OEM will not be completely up to the task as these fans do crave some amps and in conjunction with Alternator upgrade , upgrade the cable from alternator to battery/fusebox

As opposed to using temperature switches that do give random performance at best , I would recommend if not using a standalone , to use a dual fan controller with ac override to ensure both fans kick on at high speed with ac load .. remember, these fans are designed as low speed/high speed fans ..

I do have this setup but use PHR aluminum fan shroud and I use 2 of the 5 blade is300 fans

 

Thank you for the input, I will definitely upgrade to a 170amp alt and upgrade the power wire as well. Where would I find or who sells the "dual fan controller with the ac override" that you would suggest? When using google, I have found several ranging from $50-$300 and most of them say they are for chevys and fords. I was looking at the wiring harness from PHR, but its a little on the pricey side at $300

 

You won't need 170A unless you're building a show car with a sound system. You can get by with 130A.

 

For what its worth, I think the is300 only had 110 amps. Granted thats ~10% more than ours but I will be taking the plunge soon with is300 fans on my 1JZ so i'll chime in with more firsthand info

 

In OEM form , is300 came with a solid state relay / fan control module to mitigate amperage draw . One could use something similar I guess but from what I've researched in the past was cost prohibitive. I use a mechman 170amp for when you couple the fans usage with running dual pumps and gauges , I'd rather play it safe especially in south Florida heat when ac is also in the mix