If the cooling unit does not work at outdoor temperatures exceeding +5°C, this means that a malfunction has occurred. The reasons may be the following:
Air conditioner fuse blown. Check fuse and. if necessary, replace it.
The cooler has switched off automatically for a while because the engine coolant temperature is too high
In the event that you cannot rectify the fault yourself, or if the cooling capacity decreases, switch off the cooling unit. Contact a specialized service station.