I also had the same problem on my 92 es300......however when i purchased the car it just had a new high pressure hose replaced..the hose along cost about $320 at toyota...and around $25 at Auto Zone,,,,the leak continued however and now i have to replace the top hose that runs from radiator around motor to pump...i think the cost of this hose is about 120toyota and 65 from other parts store. Hope this helps