2001 Nissan Xterra 3.3 v6 I can see the coolant drip on the ground but cannot see where it is coming from, any ideas suggestions? , also it overheats and does not replenish from the over flow. Please help
I'm going to guess that it is from the heater hose that goes from the engine to your cabin A/C. The overheating is from the lack of pressure due to the leakage and air getting into the system. The lack of renewing from the overflow container - same thing - when the system is cooling down and normally the pressure drops - then it normally sucks back in coolant from the overflow. Since there is leakage, there isn't a drop in pressure.
If this is the case, you should be able to track it down, check the hose clamps. If you are in a temperate zone, you should be able to run a hose to bypass the A/C if the leak is within the cabin and you don't feel like tearing out the dash to get at it.