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For a daily driver that sits in traffic for 60+ minutes a day, I can see how that might kill an engine over time. But I don't think that's your case, P-Lap...if I recall this isn't your DD. Turning the A/C on every time you are idling, however, could cause your condenser to fail. (I'm not saying that was the cause, but if you are constantly cycling it off/on every time the temp rises, it deserves mention).
If per Jake R. idle is the issue, why not hold the rpm at 3k when sitting in traffic? And again, if your temp is going that high, there may be another issue. I always thought that turning on the A/C had the reverse effect (I realize the fans in the 986 may be slightly different that most cars), but back in the day we used to put the HEAT when the engine ran hot to bleed off as much hot air as possible. (Insert bad flashback about being in the back of station wagon with the heat on in August).
This is yet another thread that makes it sound like these cars are fragile, and I don't think that's the case.
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