I know that the stock computer uses all 4 relays to run the stock fans. How does the PFC go about controlling them? Does it use all 4 relays to run the fans through all of the different modes, or does it just do an on/off operation? I am asking bc I am thinking of going to new fans, mine burnt up, and was wondering if I could pull a couple of those relays out. Anyone know?

 

It appears to run as stock as it still has three fan speeds.
You have to use a Datalogit to change the temperature change points.

 

Yeah, I've switched them before w/ the Datalogit. Does it have three speeds, or just three different set points? Thanks for the reply though.

 

"It appears to run as stock as it still has three fan speeds."

You can verify this if you have the fan mod switch installed or ground out the thermoswitch.

 

Would doing that verify how the PFC controls them? How so? I've never thought to look and see if both fans switch on when the PFC turns them on or not.

 

Both fans always work together at the same time.

 

So if both fans work together all the time, There really is no need for all 4 of those relays is it? You should only need 1 to turn the fans on.

 

You need to read about the fan control in the manual as you are still "in the dark".

 

In the dark? Maybe, or either I have thought about this too much and just confused myself. I know the stock computer uses all 4 relays to run the Fans. Are you saying that the PFC manual tells you it uses all 4, or that it only runs in a certain mode? I'll have to read them again when I get home in the AM. Like I said in the first post, I am installing new fans, and want to know if some of the relays can be pulled. Thanks for the help.

 

The Mazda manual explains how the relays work to control the fan speeds.

Many are show the way, but few follow the correct path to fulfillment!

 

Yeah, I read the manual about it, and I understand how it goes about controlling the speeds and fans on/off time. I just wonder if I install new FAL fans (or something similar) whether or not I need to leave all that in, or if I could pull off just running new relays for those fans. Wouldn't it be more simplified to just run them on high? I don't drive this car alot, its not a daily driver, and it can get right hot and humid here, so running them at full on, for the few times I drive the car shouldn't be a bad thing. Thoughts? And thanks for the imput, I appreciate it.

 

If you have aftermarket fans with only a single speed, then you only need one relay to run them. Pick a relay that always is on when the temperature is reached with the PFC.

Our fan motors are wired for three speeds and you can wire them to always run thatway by using jumper wires to energize them.