after a highway run yesterday in fairly warm conditions (about 85deg F ) my aux fan went on after the car was at idle for a short while (about 15 minutes). it only stayed on for about 30 seconds. the temp gauge showed nearly 100 deg C at the time the fan went on.
as a reference my a/c was not on at the time, the CC was in the off position (and the a/c doesnt work anyhow).

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1984 300D Turbo - 231k....totalled 11/30/07 RIP