eallanboggs

iTrader: (1)

Installed electric fans using two relays. One is temp. controlled and the other is triggered off of a A/C relay coil circuit wire. I'd like to add and additonal condition to both of these relay coil circuits that says if the vehicle is moving at least 50MPH or the transmission is in 4th or overdrive(either condition will provide the desired result) I want to disable the relay coil circuits. This will save the fans at highway speed which don't need to run at over 50MPH anyway. Has anyone tried doing this?

SOMbitch

iTrader: (8)

The car is going to cool down and the pcm will cut them off at that speed anyway so isn't it kinda redundant??

Edit: Ah, fan still runs regardless if A/C is on. Hard wire them to switch maybe? Sorry I'm no help!!

jimmyblue

iTrader: (11)

If you control for temp off the radiator tank exit
then rolling airflow will do the job for you, when
it's really enough to replace the fans. But I've
seen my car fail to hold thermostat setpoint on
the highway at 80MPH when the A/C is on. So
not sure you really want to consider overdrive
"sufficient proof" that you have enough airflow.

eallanboggs

iTrader: (1)

These are aftermarket fans which I wired myself using the readily available 30A automotive type relays. I've got the thermostat set point just above the normal running temp. so my fans hopefully are off while on the highway unless I'm using the A/C in the summer. I guess I only need a way to tell the A/C relay I use to control the fans to deenergize at highway speed unless the water temp. goes over the set point(over 80MPH) in which case the thermostat controlled relay should override.

oange ss

iTrader: (50)

only if you have electronic controller with a speed refernece input of some sort...i cant think of anyway to get a thermostat type controller to work that way...could just wire a cutoff switch to the A/C relay...