Fans run very slow

This engine has what is called a hydraulic cooling fan. Basically, it is a fan clutch that is engaged using fluid.

I doubt this is a relay or electrical issue, but we should check voltage coming out of the fan ECU just to check and make sure it is being commanded on high when it is supposed to be.

https://www.2carpros.com/articles/how-to-check-wiring

However, if the fan starts spinning as soon as the engine starts and does not speed up then I suspect the fan has failed.

Here is a guide that will help with similar information even though this is a slightly different system:

https://www.2carpros.com/articles/fan-clutch-symptoms

I am attaching the info below on this fan including the bleed procedure to see if this restores normal operation or even improves it.

Please run through this info and let us know what you find. Thanks