well my brother am in ph and coming to aba for this couse may not be really possible now because am deeply occupied so i advice u ask a mechanic nearby to assist you in sourcing for people who runs scan for them they know them. but have you checked those things i spelt out? another thing you should look out for is if there is leakage in the radiator or its reservoir pls take this steps and make efforts before consulting your mechanic.

u said when steering is fully turned have you checked ur power steering oil if oil is short it can cause it another cause is when the power steering pump is bad and could not pump the exact level of oil needed at a turn if all these thins are ok then check the shaft and hose the are always linked to this kind of problems. am an auto technician working with park n fix autos ph. call 08107899226!

well bros check if there is water in ur radiator and the water reservoir tank if yes check engine fan is it working when car is on? if yes then check the engine temperature sensor its between the water pump and the car engine front check if its disconnected if all this things are ok then consult ur mechanic. it could be a fault that needs diagnostic tool to dictate ok.