Good grief, making a fan shroud is a pain, at least a bigger pain than I thought it would be.
I started out with the shroud about 1.75" deep. However that didn't work because it would hit the lower radiator hose connection. The outlet angles towards the center of the radiator. So I had to cut it down to closer to 1" thick.
Then it took me a couple of tries to get the lower bracket to line up with the factory mounting bolts for the lower shroud. They weren't quite centered either with the original radiator or at least where the radiator is now.
I almost made the shroud too exact and didn't have any wiggle room.
I wired the primary feed with a 70amp relay. I could have pulled battery power straight to the Volvo controller but I wanted the fans to turn off with the motor. Plus I can add a manual switch to the relay supply to be able to turn the fans off at will.
The 12V supply I used had been supplying power to the transmission cooler fan. It is an ignition feed from the fuse panel. So the relay is supplying power to both the cooling fan and the trans cooler fan. All my reading on Volvo fan indicated people have been using 30amp breakers to protect the circuit. The trans cooler fan draws 10amps.
The 70amp relay is over to the right mounted on the core support. You can see the inline fuse for the supply to the trans cooler fan.
Because of the flooding troubles, I didn't get the temperature fan switch Friday. So I don't have the low speed wired up to that. I wired the high speed to a manual switch. My hope is the low speed will get the job done 90% of the time. Down the road I will put in a temperature switch in for the high speed as well.
The Volvo controller operates through temperature switches that ground out to the block. So I ran the high speed wire through a switch to ground.
Once I have the temp switch for the high speed, I will use that switch to completely kill the cooling fans through the big relay.