[Chuck Jones]

Check under the coolant tank on the left...look for a white crusty substance under the tank as well as around the rim of the cap. These coolant tanks are prone to cracking under pressure forcing out coolant while your'e running, but not enough to drip on the garage floor. The caps are also prone to failing...if your cap number ends in a 0 you should upgrade it to the one that ends in a 1.

If you see the white crusty stuff, you probably need to replace the tank. There's a lot written on the subject here and on Rennlist. Do a search under "coolant tank" or "coolant smell". There's also a DIY on RennTech complete with pictures that shows you how to replace the tank yourself. I had to replace mine not too long ago. Very common failure on the 99-01 cars.