In order for the pressure tester to work, the 4runner has to be cold, then the mechanic would add water/antifreeze enough to top it off, then put the tester on it and pump it up to the reading in bars (I think on the 4runner) on the radiator cap and wait for at least ten minutes to see if the needle drops:
https://www.youtube.com/watch?v=K5p-G3UDi-A
Or did he use a hydrocarbon tester (compression gases), which is fine on a hot engine:
https://www.youtube.com/watch?v=ON_RtokUohI
Valves, probably not IMHO.
Keep us posted.
He had a pressure tester like in the first video which he attached to the radiator opening after topping it completely with water.
Lets see what diagnosis he comes up with tomorrow morning.
Will keep you all posted. Thanks for all your help guys.. :sadwave: