105 in hot weather with a/c on is probably OK. As long as it doesn't keep climbing while sitting at idle. If it drops down to about 95-100 in the city, you're probably OK. Keep an eye out for trends to staying elevated. Check the t-stat and cooling system, especially hoses. Gotta be on top of that stuff for hot weather and a/c use.

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Jeff L
1987 300e
1989 300e
1987 BMW 325