I own an 87 Iroc with a 355 c.i. in it. When I had the motor built the guy wired my fans to come on at the same time at 200'o. My problem is that when they both kick on, they really spike the alt. I have to keep putting regulators in every few months! I'm looking to see if anybody makes a fan temp switch that I can make one fan come on at 200'o and the other at 210'o. Does anybody know of any companies?? Any info will be helpful, Thanks guys!!

 

There arent any, they control both fans at one temp. You can either add another switch, or what I would do is use the stock switch in the passenger side head, maybe get a lower temp one like at 210 which isnt too hard to find at an auto parts store, just ask to look in their buyers guide, it should list all PN's and temps. Standard Ignition has a very good buyers guide listing.

BTW, I am thinking you have a different problem. I happen to have an insane cooling fan setup on my car, and I dont have any alternator problems. You can always try it, but I suspect its something else.

 

I am sorta with mad

I got a perma cool adjustable fan switch and was using it on a SPAL twin 12 inch setup (that pulls 37 amps). You could not adjust the off setting on the perma cool (they make two different fan controls by the way, one is adjustable and the other is set at 180) and the fans could still be running when the temp had gone below 180. So, I put one on a toggle switch and the other I have running off of the adjustable sensor.

The one fan will allow the motor to stay above 190 and if it gets more than 205 the second fan switchs on.

I did not run it long with both fans but I did not have a problem with regulators.