Coolant smell.
JK Jedi
Joined: Jun 2013
Posts: 11,362
Likes: 2,089
From: Willow Park, TX
JK Newbie
Joined: Oct 2020
Posts: 69
Likes: 3
From: Jackson, MI
Oddly enough, someone just had a different thread asking about "what top is this" that they just purchased. I dug and dug and boom, it was one of the first Bestop hardtops they made from back in '07. Since you asked, that is what I believe that top was. Looks exactly the same, and the hinge on the back window is the give away. Good for you for making them swap that out. You won that one. 
Top of the coolant reservoir if need to, and keep an eye on it. If you're losing a little coolant over a few weeks, you likely have a pinhole in the rad. Takes 10-15 mins to yank the intake boot and airbox out, which then allows you to pull the fan shroud out and inspect the backside of the rad. Often those leaks are never big enough to let anything get to the ground before baking off. just keep that in mind if you keep seeing the resi level drop.
Top of the coolant reservoir if need to, and keep an eye on it. If you're losing a little coolant over a few weeks, you likely have a pinhole in the rad. Takes 10-15 mins to yank the intake boot and airbox out, which then allows you to pull the fan shroud out and inspect the backside of the rad. Often those leaks are never big enough to let anything get to the ground before baking off. just keep that in mind if you keep seeing the resi level drop.