I have done away with all the OE renault coolant hoses on my F7p and I only use 1 main out on the header tank bottom and the small return on the top. I also use an external oil cooler located were my driver side foglight would be.
My coolant system goes like this
90 deg from water pump to base of clio rad, then it comes out of rad to thermostat housing, then back of thermostart housing goes to base of heater matrix, then heater matrix to header tank, block off other header tank lower port, the little one at the top goes to the theremostat housing top. I also blocked off the side out on the theremostat housing which would have gone to my other header tank port that I blocked. I have not had any coolant temp problems or pressure problems at all with my setup.