Glass Pack Muffler Exhaust system

I just got done installing a glass pack muffler. I removed the CAT and basicly made it a straight pipe with the glass pack.

I went and took it for a test drive. Sounds Awesome. One problem though. When I got back, I popped the hood while it was running and I saw steam coming from the radiator area. I never saw my fan running either.

Now, my question is, now that i've done this huge modification, do I need to reroute the cooling system to kick on at cooler temp.? I'm at a stand still with this, as I thought the only problem I would have would be the O2 sensor.

Thanks for all the help in advance.

One is not related to the other.