From the Hummer Knowledge Base:
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Originally Posted by Hummer Knowledge Base
Checking fan clutch:
1. Check for excessive bearing play. Using fingers only, press tip of fan blade toward and away from engine. Tip of blade total movement should not exceed 0.20 in. (5.1 mm). If movement is more, replace fan drive.
2. With engine off and ambient temperature of 50F (10C) or higher, fan should turn evenly with noticeable drag. If fan turns hard, very easily, or with uneven resistance, replace fan drive.
Dave on temp differences:
There was a lot of comparison of temperatures between owners, with some owners becoming concerned that their trucks were different than others. The gauges are not all that accurate, so these comparisons didn't mean very much anyway, but they did cause concern among owners.
Because of this (and other reasons), AMG changed the gauges in the later trucks so that no "actual numbers" were on the gauges.
The most important thing is to get accustomed to how your truck behaves, and watch for changes in that behavior. As long as your temperature reaches a steady level, and only goes above that when the engine is working hard, you have little to worry about as far as "engine temperatures" are concerned.
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Continue to monitor your temperature and check the fan clutch. From what I've read, the temp may go up to 220-230F before having the fan engage. Perhaps you're experiencing the increase in temperature because ambient temps have been increasing on the way into Spring.