I've only had one fan working for a while now. Read, read, and read some more and finally ordered a new controller.
Put it in yesterday and today the car overheated. It seems the new controller only spins the fans at very slow speed.
Tried the AC on coldest setting and no change. Tested both fans before plugging in new controller and they work full speed.
Getting ready to put old controller back in since it never overheated with it, but it's not correct either.
In addition to only spinning one fan it didn't seem to have any speed management, only full speed.
It also seems to stay on longer than I would expect after turning the car off. It does come on with AC.
The old controller has #'s 940.0040.03 & 301000299109 partial sticker, that one may be missing digits off the beginning.
New controller is beck/arnley part # BEC203-0291. The controller itself looks identical to the old but has #'s 3604-353 & 231127 on it.
This is on an 07 3.0
Edit... both controllers have the 4pin input, remember reading that cheap ones only have 3pins
Thoughts?

 

My understanding is that only the Gates controllers will work

 

You have to make sure the 4 pin receptor has metal contacts ineach female receptor. The cheap Asian ones do indeed have a 4 pin receptor, but lack the contact points in on female receptor as well as internally in the unit body they lack the appropriate wiring and relays.
The easiest for sure way to get the correct controller is buy a Gates FCM 134.

 

So I put the old controller back in and it did the same thing as the new controller, both fans slow speed 🙃
I unplugged the fan that wasn't working before and the other fan will run full speed with AC (and assume with temp) like before.
Being curious I reconnected the disconnected plug and unplugged the other plugged in fan. This fan also operates full speed with AC.
I'm assuming that the one wasn't properly connected before, either accidentally or purposely since it's been that way since I bought it.
So now I am back to square one, can't get both fans to run...
Anyone think it's possible both fans combined pull too much current causing this issue?
I'd hate to eat the cost of this beck/arnley controller then pay twice that for a gates and still be back to square one!

 

Just checked and I can confirm that the beck controller does have 4 metal pins and there are different resistance values between combinations of pins so they are all connected to something atleast.