ECU Controlled Fans - VA Binary or Trinary Switch

[Z06vette]

I gave up trying to get the E38 to control twin fans. I used the entropy fan controller. It has has an AC trigger wire, and the dip switches let you easily set the on/off temps for each fan. I know this isnt exactly the answer to what you are asking, but its an option. Scott

[lsuguy]

I found this on a C10 truck forum. It appears that it will work but I am open to comments on this. Worst case is that the fans are powered by more than one relay under some circumstances but I don't think that should be a problem...

I have seen the entropy controller and its a nice setup.

[dhutton]

That will work fine. I did the same thing several years ago. I prefer the series/parallel low/high setup, but this will work, just a little noisier in low speed.

Don