Citroen ZX refrigeration

Hello. I have a Citroen Zx Avantage 1.9 diesel. I stop working the refrigeration circuit. I think it is thermostat that does not open. Where is it located and how can I change it? With liquid engine does not pass through the circhete, it accumulates on a very precion radiator. Antifreeze I have is green but almost red. Because ? Oil does not have water or oil antifreeze so I don't think they are Qulata problems. Halguen can help me with these doubts?
Thank you.

Friend, as I leave as a functioner is of engine refrigeration what you say?, if so, check the electro -ventilator, first, the precion you say can occur because the radiator is covered, if it is not that the compression is passed through the butt.

Thanks for answering.
But if it happens for the cylinder head, does it have to happen too and oil? And anticonjelanto has no oil (or that is what I think is not notice), but everything comes out of red clay and after drying (in a bowl) leaves a red powder. If it is oxide - where does it come from? What is in the circqu that can oxidize? Today I have purged the circqu with water and bicarbonate starting a car for a short time but this weird liquid continues. And the circqu is covered at the height of heating radiator. The main radiator overface can be caused by water pump? A, and car starts well and the smoke that comes out is normal.

Look, do not mind, if the compression is passed, the oil or water is passed, but the color that you mention of the refrigerant makes suspect in oil, now check the compression of the silhinders to bewitched, the water pump does not have much to do because it does not increase the precion must maintain it, check comprehensive and warn.

Hello, I am seeing what happens to you and it is possible that, changing the entire radiator, the problem is removed. That clay is the oxide that has generated and obstructs you the radiator's ducts, there is that pressure. But looking at the compression would not be more to rule out other faults.