As Bob says it's not that bad if it maxes out at 220. But if on 90+ degree days you find it going higher there is a long list of culprits. A couple of quick ones are to make sure your fan clutch is getting full engagement when at it's set point It does not matter if you just bought it as there is a lot of junk out there. Here is a video to help you get an idea of how to test it's definitely not the best so do your homework https://www.youtube.com/watch?v=cOXcrbQRDWU You should also hear a lot of roaring from the fan when revving the motor with the hood up and at full temp. Another thing to check is the depth that the fan sits into the fan shroud, to deep or not deep enough and you will have temp problems while sitting still. Unfortunately aftermarket fan clutches do not get this right. I have my original 68 unit and have compared to 3 different aftermarket units that were listed for a 68 Firebird and all 3 caused the fan to sit at different depths.