MP 1,1-5,1 PCIe fan not working? [Solved]

[Project Alice]

The PCIe fan on one of my 4,1>5,1 Mac Pros is always at 0 RPM
Its running proxmox and the PCIe slots are full. It doesn’t have Mac OS installed at all so I can’t use Mac Fan Control. Is there anyway for me fo force that fan to run from a firmware command or something?

 

[tsialex]

Defective circuit or even the fan, the PCIe fan always runs and the rotation independently controlled by the SMC, unless you override it via software, but you can't turn it off.

Start testing with the whole fan assembly with another Mac Pro. Also check if any components are not ripped from the area, unfortunately is very common to damage components when removing the mini-PCIe power cables.

 

[Project Alice]

Defective circuit or even the fan, the PCIe fan always runs and the rotation independently controlled by the SMC, unless you override it via software, but you can't turn it off.

Start testing with the whole fan assembly with another Mac Pro. Also check if any components are not ripped from the area, unfortunately is very common to damage components when removing the mini-PCIe power cables.

So the PCIe fan should always be running? Yeah this thing has been running for abput 2 days (not including reboots) and that fan has been off the whole time. There's an HBA card in there and I've been getting some weird zfs errors so that could explain that if the card is getting hot.

I only have one other 5,1 and it is my actual desktop computer running Mac OS; it's fans seem to be working fine. I guess I'll stick the PCIe fan from the server MP to my other one and see if it works or not.

 

[Project Alice]

So I swapped the fan from my "desktop" Mac Pro to the other one, and it turns out that fan is definitely bad. I will keep the working fan in the server since its on 24/7 and has more going on in the PCIe bay than my desktop MP does. I'll order a new one on eBay and til then I think it'll be okay without it.