Sprung a coolant leak on the way to work today. I guess the drive from Barstow to Fort Irwin was just a little to hard on my Runner today. I see where it is leaking from but I don't know what that hose is called to get a new one and was wondering if any of you could tell me what its called. It is leaking from the small hose that goes into the thermostat housing behind the radiator hose. Also how hard is it going to be to replace it? On the plus side though it did steam clean my engine compartment though. LOL

 

I think you are refering to the water by-pass hose, it keeps your water pump from cavitating when the thermostat is closed(lets pump keep pumping)
http://www.toyodiy.com/parts/p_U_198...MSEA_1603.html