you may need to replace the water pump..the water pump has a weep hole in it and is made to leak when the bearing in the pump is bad...i would think the coolant is steaming out of the weep hole.it would also be a good idea to replace the timing belt also while you have it apart if the belt has not been replaced in a while..the heater wont work when it gets low on coolant
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1999-00 3.3L Engines
CAUTION Never open, service or drain the radiator or cooling system when hot; serious burns can occur from the steam and hot coolant. Also, when draining engine coolant, keep in mind that cats and dogs are attracted to ethylene glycol antifreeze and could drink any that is left in an uncovered container or in puddles on the ground. This will prove fatal in sufficient quantities. Always drain coolant into a sealable container. Coolant should be reused unless it is contaminated or is several years old.
NOTE The following steps require the use of a strap wrench to hold the water pump pulley while loosening and tightening the bolts. If a strap wrench is not available, loosen the bolts before removing the drive belts. The drive belt tension will help keep the pulley from turning while loosening the bolts.
NOTE Allow the sealant to dry for at least 30 minutes before adding coolant.
FIG : Water pump and water pump bolt location
FIG : Using a strap wrench to hold the water pump pulley while loosening the bolts
FIG : Water pump sealant application