Big climate problem

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Mazda cx-9 2008
Hello. I have a problem with climate. in May I bought air conditioning and after 1 month it did not cool. Service has found a leak under the coolant tank. The air conditioning was repaired and refilled. After another month, there is no refrigerant again. I gave the car to another service and they do not see the leak. Where else could the fault be? Maybe under the car and a plastic cover? Where is the second heater? I am asking for advice.
 
Why did you bring it to a different shop?
Bring the car back to the shop that found and repaired the leak and refilled the refrigerant. Let them figure it out. You should not have to pay for something that they said they fixed. Next time, ask them to show you where it was leaking, and how they are going to fix it.
 
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