Seems strange,
Are you using a mercedes or aftermarket thermostat? My car acts up when the radiator didn't hold pressure. Are you leaking any fluid over time??
Mine with the leak fixed is rock steady 86 C. It's factory part.
Michael
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Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E
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