PWM cooling fan(s) control using ECM

[Syclone892]

Hi Scot

I am defiantly new to this stuff and trying to understand just so you know and can go easy on me
From what I have been reading the dominator will send out a pwm + or - signal, if I wire that to a solid state relay the relay is able to handle the pwm signal and will pulse the power or ground of the fan. Here is where I got the idea
http://forums.holley.com/showthread....Fan-Holley-EFI
So the way I understand it is the ecu is doing the controlling and can speed up or slow down the pwm and the relay will then pulse the power (or ground depending on hookup) to the fan.
To me thats what the stock e67 ecu is doing and sending it to this module which to me sounds like a ssr.

If I was able to get more info on this control module I may be able to understand it more but so far thats what I have gotten out of it

If this is just a nice ssr I was thinking of using it to control my fuel pump also because that is way less amps than fans.

Thanks for more info I hope I can understand this stuff even more before I have to start doing the actual work!

[samckitt]

Hmmm, give ti a try then & see if it will work. Let us know.

[Syclone892]

Well I just got one from amazon. First thing I must say is wow its bigger than I thought. Guess I should have looked at the amazon ad where it says 6x6x4. Figured I would mention that maybe others have thought it was smaller also.

I am still waiting for the dominator to show up so I can not test anything just yet but I defiantly will when it gets here
Now on the connector I would really like to find it, my brother looked at the #'s that were posted and he said the part # is the first 5, 48769. The 4 after it has something to do with the cavity and all the others are the type of material, pa6 is some sort of material along with gf and the 15 and 30 are the percentage of gf.

We searched all the places he could think of and no luck so far. He wanted to see if anyone could get some good pics of the connector especially on where the #'s are as that helps to see what brand it is I guess.
Hes also going to check through his work his they can come up with anything.
Otherwise I told him I'm going to have him 3d print me one

Just wanted to give an update and if/when I find anything on the connector I will get the word out and hopefully be able to help someone!

[dontlifttoshift]

When starting from scratch, how are you guys mounting the GM AC pressure switch?

[parsonsj]

It was a 3 step process for me: 1. get a sensor from GM (I called Jeff Tate at Riverside Chevrolet). 2. Get an adapter (I went to the local auto A/C expert) for the sensor to screw in. Cost me $20. 3. Send the assembly to Vintage Air, and they brazed #8 A/C ends on the adapter.

[dontlifttoshift]

I see, you put it in the 8. I'm going in the 6 with mine....at least I want to.

For an #8 with EZclip weatherhead FJ3427-0808s is an inline splice with the correct M10-1.25 port on it.

I was hoping someone had an adapter that would go in the drier.

[parsonsj]

Yep, that would be cleaner... but not how GM did it.

My Z06 has the sensor inline in the 8, so I followed suit. I doubt it matters.

[samckitt]

Is there a preferred position where the AC pressure switch needs to mount? Between compressor & evaporator, evaporator - condenser, or condenser - compressor?

[Vince@Meanstreets]

Originally Posted by samckitt

Is there a preferred position where the AC pressure switch needs to mount? Between compressor & evaporator, evaporator - condenser, or condenser - compressor?

anywhere between the condenser and evaporator. #6 line

[snappytravis]

Originally Posted by Syclone892

Hi Scot

I am defiantly new to this stuff and trying to understand just so you know and can go easy on me
From what I have been reading the dominator will send out a pwm + or - signal, if I wire that to a solid state relay the relay is able to handle the pwm signal and will pulse the power or ground of the fan. Here is where I got the idea
http://forums.holley.com/showthread....Fan-Holley-EFI
So the way I understand it is the ecu is doing the controlling and can speed up or slow down the pwm and the relay will then pulse the power (or ground depending on hookup) to the fan.
To me thats what the stock e67 ecu is doing and sending it to this module which to me sounds like a ssr.

If I was able to get more info on this control module I may be able to understand it more but so far thats what I have gotten out of it

If this is just a nice ssr I was thinking of using it to control my fuel pump also because that is way less amps than fans.

Thanks for more info I hope I can understand this stuff even more before I have to start doing the actual work!

I hooked my fans up to the holley hp ecu. I had to go in and turn the fans on and then designate two wires for 12-, I set the temp at when I want fan wire 1 to come on and it sends a 12- signal to the relay. I then set the temp for fan 2 wire and it also goes 12- when the temperature is reached. Seems to work good so far. For your fuel pump get a hold of Carl Casanova he is the owner of vaporworx. Good guy and great tech support.