PWM cooling fan(s) control using ECM

[andrewb70]

Originally Posted by 68LS1

Can someone confirm the part number for suitable fans to use with Holley EFI

What are the suitable fan options? C7 Corvette and any thing else.

This is for my 71 Blazer, but may also update on my 72 C10

thanks

There are many brushless fans that will work with the Holley EFI. It would be helpful to know the size of the core of the radiator you are using. On my 70 GTO I am using the dual Chevy Volt fans that fit the 26x18X core very nicely.

Andrew

[68LS1]

Originally Posted by andrewb70

There are many brushless fans that will work with the Holley EFI. It would be helpful to know the size of the core of the radiator you are using. On my 70 GTO I am using the dual Chevy Volt fans that fit the 26x18X core very nicely.

Andrew

The core size is 16-1/8" H x 28-3/8" W. I have a preference to run a single fan

Will be using a Holley Terminator Stealth

[andrewb70]

Originally Posted by 68LS1

The core size is 16-1/8" H x 28-3/8" W. I have a preference to run a single fan

Will be using a Holley Terminator Stealth

The C7 fan should fit your core nicely and will work very well.

Andrew

[68LS1]

Originally Posted by andrewb70

The C7 fan should fit your core nicely and will work very well.

Andrew

Is this the one I should order, Part No 84486698?

https://sdparts.com/i-24135048-genui...iator-fan.html

thanks

[andrewb70]

Originally Posted by 68LS1

Is this the one I should order, Part No 84486698?

https://sdparts.com/i-24135048-genui...iator-fan.html

thanks

That is the one...

Andrew

[flyingv]

For any of you with an E67 from an 09' vehicle, here is what changes I made to finally get the C7 PWM fan to work.

1. I changed the OS from 09' CTS-V to an 09' ZR1

I did confirm through a document on the EFI Live forum that the 2 OS's are compatible.

*no matter what i did with the CTS-V calibration, I could not get a output signal from X3-49*

2. I changed fan settings to PWM Electric 100hz

*PWM EV 100hz did not work per the C7 calibration*

3. Fan State vs. Desired (all zeroes)

4. Output State vs. Control (all 1's)

5. Wired in AC pressure sensor @ X3-21, X3-57, & X3-37

Viola! PWM fan control works in the scanner!

[andrewb70]

Originally Posted by flyingv

For any of you with an E67 from an 09' vehicle, here is what changes I made to finally get the C7 PWM fan to work.

1. I changed the OS from 09' CTS-V to an 09' ZR1

I did confirm through a document on the EFI Live forum that the 2 OS's are compatible.

*no matter what i did with the CTS-V calibration, I could not get a output signal from X3-49*

2. I changed fan settings to PWM Electric 128hz

*PWM EV 100hz did not work per the C7 calibration*

3. Fan State vs. Desired (all zeroes)

4. Output State vs. Control (all 1's)

5. Wired in AC pressure sensor @ X3-21, X3-57, & X3-37

Viola! PWM fan control works in the scanner!

Good information. Nicely done.

Andrew

[samckitt]

Originally Posted by flyingv

For any of you with an E67 from an 09' vehicle, here is what changes I made to finally get the C7 PWM fan to work.

1. I changed the OS from 09' CTS-V to an 09' ZR1

I did confirm through a document on the EFI Live forum that the 2 OS's are compatible.

*no matter what i did with the CTS-V calibration, I could not get a output signal from X3-49*

2. I changed fan settings to PWM Electric 100hz

*PWM EV 100hz did not work per the C7 calibration*

3. Fan State vs. Desired (all zeroes)

4. Output State vs. Control (all 1's)

5. Wired in AC pressure sensor @ X3-21, X3-57, & X3-37

Viola! PWM fan control works in the scanner!

Did you use EFI Live or HPTuners to change the OS?
Will it work without the AC pressure sensor or is that required?
Thx