2006 v6 4runner Coolant issue

[rideracewin]

I have a coolant leak that is intermit. Pressure test showed nothing. Coolant is ending up on driver frame rail and battery and behind battery. Maybe losing a cup a week. Never overheats. Sometimes doesnt leak. for a week or two. Any ideas? No water in oil. No oil in water. Trans is clean. I have heard heater core fill a few times. No trail on engine or pulleys or belt. Plan is to change thermostat and cap. Any ideas. My Toyota techs in town are puzzled. I never own anything but Toys. Never seen this before

 

[Gecko123]

Funny you should ask as I have a 2006 4runner v6 as well with coolant loss issue. I found my leak. It's on the side of the radiator. The side closer to the battery.