How do I drain the old coolant, which is mostly water, in my citroen c4 as I need to add 100% coolant due to overheating problems
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Apparently the Citroen C4 can be a bit of a pain to re-fill the coolant system without trapping air in the system.
There could conceivably be an air-lock if you're having overheating problems. As Paulster2 says, it's very unlikely a car that overheats on water would not do so on coolant.
The system has a bleed screw in the header tank (adjacent to the brake servo). You may be better trying to bleed the air out of the system rather than draining and re-filling.
I realise that does not directly answer your question. The actual answer to draining your system, the question as asked, is to remove the radiator bottom hose and catch the coolant in a suitable container under the front of the vehicle.
Steve Matthews
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