[EJ_2001_986_S]

I had a very similar experience with my car (2001 S). My temp needle never moved from around 180 but I dumped coolant all over the parking lot. It emptied almost the whole coolant reservoir. I had recently replaced the cap and refilled the system, had it supposedly vacuum bled by the dealer, and it still boiled over through the cap and dumped down the drain. It turned out that I didn't have the driver's side fan running properly. There is a resistor that according to a local Indy mechanic goes bad somewhat regularly. When it goes bad you lose one of the fan speeds and it can cause the car to dump coolant. That's what happened to mine. They replaced the resistor and the cooling system works fine now.