Adding trinary switch signal to fan relay setup
Thread Starter
On The Tree
Joined: Sep 2010
Posts: 197
Likes: 1
From: Phoenix, AZ
OK, cool. I'll just add the extra relay for the trinary signal. As long as the pcm is safe/happy when the high temp relay(s) and trinary relay are all latched, I should be good to go. It's an easy wiring job too.
Thanks!
Thanks!
TECH Addict
Joined: Oct 2016
Posts: 2,513
Likes: 480
From: PDX-OR-USA
Good luck, yea I just had to do the head gasket on the Honda (07 FIT) because the radiator cracked and the fan never came on till it was a geyser.. 
Thats when I figured out the fan spec.. arg.. 
I wanted to run a stock ecu (but for vats, etc) and the fan engagement temps were higher than I wanted. Besides, I had a PWM digital variable speed fan controller already on the car. No high amp motor starts, only spin the fans as fast as necessary to maintain set temp, activation with the a/c, and a much tighter operating temp range. Been out of the relay business for 15 years. But I did use the higher temp fan activation ground to illuminate a high temp light in the dash...
