Meriva air

Hello, I am having problems with the air of my meriva which is 2007 1.8 8 Argentina's valves, the problem is as follows when I connect the A/C begins to cool after a few minutes it stops by leaving hot air and when I take speed it starts cooling again. No malfunction light appears to me already scanie with op-com and I have not taken any fault, I have taken it to a lot of air technicians but one wants to change the ECU another the compressor thus with a lot of stupideces without reaching a solution, thank you very much already

Good, have you checked if electrventilators work when you connect the air conditioning?