Under-mop wetness

First of all, I used my 2010 model 206 seda vehicle without antifreeze for about a year, I went to the industry to have maintenance last week and I added antifreeze a few days after adding antifreeze. I saw that it was slightly red. The strange thing is that the water in the expansion vessel does not decrease or seems to me.

Please, can friends with knowledge on the subject offer something? What is wrong?

comes from the heater core. Since it is used in the vehicle without antifreeze, it makes rust, etc. and clogs it. When you put antifreeze, the antifreeze dissolves that rust and there is a honeycomb under the plastic piece that corresponds to your right leg. There comes also 3 screw holes on the honeycomb.

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