I agree with jsmith. had the same problem-car running only about 5-7C hotter than usual. Replaced a pressure cap and everything was back to normal

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1985 190D 2.2l Sold-to Brother-in-law
1996 Mustang 3.8l -"thinks it's a sports car"
1988 Grand Wagoneer - Sold (good home)
1995 Grand Cherokee Ltd -"What was I thinking??!!"