Engine fault due to air conditioning?

[LM42]

On the very hottest days, we getting a error, engine fault " orange ! Mark" on dash when we have the air conditioning on?

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[Zion]

Listen. You need a scan with Diagbox or at least a professional scan tool. Otherwise we are all guessing at what the error mark means.

That error light is used for hundreds of different faults. There is no way anyone can tell you what it means on its own.