I just picked up a '98 GS300. Got off work earlier today and decided to change the oil on the GS. Right after getting under there I was smacked with the below image. Any idea where this coolant is coming from?

 

Hard to tell from the pic but if the water pump is on that side thats where Id point a finger at

 

Drivers side end of the oil pan

 

From the way its stained that bracket, I'm gonna say your A/C compresser or the hoses to the compressor are leaking. That looks a lot like ultraviolet A/C dye.