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Today was drive my x 2000 v10 limited 4x4 114k miles). It was 90 degrees Out and was driving in light traffic going 40 and noticed my temp gauge almost up to h then dropped fast. So shut the ac off and it continue to rise and drop fast I went few more miles to where I was going checked everything could see no problems it sat for about 30mins then left on my drive back home 36 miles and had ac on and no problems stayed where it normally is. I am thinking of just replacing the belt cause I never have. Any other ideas? No wheeping from water pump. Or any smell.
I would think that the thermostat is starting to get sticky personally. It also could be a fan clutch issue. I'd try changing the thermostat first though, as they usually only cost $6 or so.
If the belt were slipping it'd be making a horrible squeal, but with over 100,000 miles it's probably a good idea to change it.