I seem to be leaking coolant, its not coming from the radiator, and all my hoses seem to be okay as well. I took some pictures after I removed the air box, the leak is on the drivers side by the engine, does anyone know where this leaking might be coming from? The second two pictures were taken from underneath the car on the drivers side after the paneling was removed. Its a 2004 RX330

 

I suspect the intake manifold gasket or the thermostat housing gasket. I had a leak like that on my RX300 and it was the intake manifold gasket on the front head. (radiator side of engine) I ended up pulling intake and replacing the gasket.

 

another option is to pick up some dye. and monitor from there. at least then you can see how fast its leaking

 

I had just posted pictures of my coolant leak under the thread "My Engine Survived 15-20k mile oil changes". The hose under the intake manifold was the culprit which had to be replaced. You can see pictures of what's involved under the thread. Also 2004 RX330 AWD but with 189k miles at the time. Good luck.

 

Intake manifold or thermostat gasket are the only things I can think of that are in that area of the car with coolant.

 

When I replaced my gasket, I also replaced the coolant hose buried under the intake manifold since you are in there...extra insurance and very low cost.