Where is the bleed screw on a citroen c3 coolant system?

There are two main bleed screws on the Citroen C3 coolant system. One is located on the top of the radiator, and the other is on the engine block, near the thermostat housing. To bleed the coolant system, you will need to open both bleed screws and allow the air to escape until coolant starts flowing out of the upper bleed screw. Once coolant is flowing out of the upper bleed screw, close it and continue running the engine until the lower bleed screw stops leaking. Once the lower bleed screw stops leaking, close it and top up the coolant level in the expansion tank.