Over the past couple months ive noticed that my coolant in my 2.7 3rz is gradually disappearing from my resivoir. Theres no leaks in the rad or hoses, no coolant in the oil, no white smoke. I have checked everything i can to figure out where its going, but i cant find anything. About every 2 weeks it will eat up all the coolant that i put in the resivoir.

Does anyone have any ideas?

 

There's only 2 places mysterious disappearing coolant can go:
1) into the combustion chamber via a leaking head gasket or...
2) out the back of the water pump (if it's a slow enough leak, it can all burn off or dry up on the engine/chassis before it can hit the ground.

Most of the time when the w.p. starts leaking it will be leaking enough that you'll see a stream running down the engine and onto the ground. But, I had a leaky water pump for a year in my truck and I just kept putting in a qt. of coolant in the overflow once a week and didn't know where it was all going - never any puddles/drips under my truck. Eventually it came time to change the timing belt/w.p. and I never lost another drop of coolant again.