fogging mystery

[Zsolt]

Went for skiing on the weekend driving my 88 5k tq and something strange happended while I was on the highway. I was doing the speed limit but I accellerated to about 160-180km/hr for a short period. Suddenly my windows started fogging up (It's fun at that speed). I was thinking oh no there goes my heating core. I pressed the "de-fog" button that slowly cleared the windows. After I switched back to "eco" mode, and crancked up the heat. No fog. I tryed "auto" and "bi-level" modes as well. It was fine, and it still is. Is my heating core leaking or not? What else could've caused it. Any thoughts?

Zsolt
88 5k tq (142,000km)
86 5k tq (252,000km)
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