PWM cooling fan(s) control using ECM

[will69camaro]

Originally Posted by samckitt

I can't say 100%, but I pulled mine off of early 2000 front wheel drive cars. I pulled a few for friends & they all worked. I bought the connector from EFI Connection & it was the same connector as what I found in the junkyard. I assumed/hoped that it was the same sensor. I think I paid $5 a piece for the connector pigtail, sensor, & segment of hose.



I haven't done it on my AC line yet, but buddy took one of these to AC shop & they removed the fitting from the tube & then braised to an elbow that then gets crimped onto a hose.

For what it's worth, a Vendor sells something that would make this slightly easier possibly.

http://www.restomodair.com/shopproducts/t-fitting/

I think that's the route I'll be going.

[SlowProgress]

Originally Posted by samckitt

Is this it?

That looks like it. I am interested in the shell, seals, large terminal and the small PWM terminal for the mating side (socket side). See slightly better photo below.



Thanks,

Scott

[samckitt]

I ordered 15 sets the last time I ordered the PWM module connectors to sell as pairs. But the place I ordered from said that was all the parts that make up the assembly that theirs doesnt require the white piece. Not sure how watertight it would be.

[SlowProgress]

So does the female side have the gasket shown in the junkyard version you posted back around page 24 or so?

[/QUOTE]

If so I would be interested in the mating female connector pins and the seal (shown here in orange).

Scott

[4wheels]

Some of the service information for the 2016 CTS-V, ATS-V and Camaro refer to a fan controller but the controller is integral to the fan itself so the ECM is sending the control signal directly to the fan. No separate/serviceable controller exists as the DC brushless (BLDC) controller is built into the fan.

Originally Posted by andrewb70

Can you post a picture of the fan itself? Is this a 800 watt fan? Presumably a 2016 CTSV uses a PWM controller for that fan...

Andrew

[samckitt]

Originally Posted by SlowProgress

So does the female side have the gasket shown in the junkyard version you posted back around page 24 or so?



If so I would be interested in the mating female connector pins and the seal (shown here in orange).

Scott

The only seals I have are the ones for the wire to connector body. I have emailed the place I ordered them from to see if they have the gaskets.

[andrewb70]

Originally Posted by 4wheels

Some of the service information for the 2016 CTS-V, ATS-V and Camaro refer to a fan controller but the controller is integral to the fan itself so the ECM is sending the control signal directly to the fan. No separate/serviceable controller exists as the DC brushless (BLDC) controller is built into the fan.

So is the fan looking for a PWM- signal at the same 128Hz?

Andrew

[4wheels]

Most of the fan controllers accept a fairly wide frequency range sp I wouldn't be surprised if all of the GM applications being discussed would operate correctly at 100 to 128 hz. You do have to be careful as to what the expected duty cycle is. What is maximum speed on one variable speed fan (or pump) can be off or an error mode with another.

Some fans also have different polarity of the signal, causing the desired fan control logic to be swapped (maximum speed vs minimum speed).

Originally Posted by andrewb70

So is the fan looking for a PWM- signal at the same 128Hz?

Andrew

[SlowProgress]

Originally Posted by samckitt

The only seals I have are the ones for the wire to connector body. I have emailed the place I ordered them from to see if they have the gaskets.

Thanks for all the good information guys. I won't be wiring until later this year so let me know on the gasket if you hear back. It sounds (and looks) like you have everything else right there.

PWM Controller - I think it was clear earlier but just in case anyone is confused this fan has the controller integrated into the fan motor housing.

Scott

[andrewb70]

Originally Posted by SlowProgress

.....

PWM Controller - I think it was clear earlier but just in case anyone is confused this fan has the controller integrated into the fan motor housing.

Scott

Scott,

Do you know the exact specifications as to what the controller is looking for?

Andrew