1982 300CD, the coolant was changed 3 years ago. When I idle for a while, like going through a drive through, the car will get hot (above 95) and I hear a fan come on.
When I get moving again, the temp comes down and the fan tuns off again.
It feels like the top hose is full of fluid.
Why am I overheating?

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1982 300CD Petrol/Black Leather