Why is my Ford S-Max making a strange noise when I turn on the AC?

I recently purchased a used Ford S-Max and I've noticed that whenever I turn on the AC, there's a strange noise coming from the engine. It sounds like a grinding or squealing noise. What could be causing this and how can I fix it?

It's possible that there's an issue with the AC compressor or the belt that controls it. I suggest taking your car to a mechanic to have it checked out and fixed as soon as possible.

Make sure to check your AC fluid levels and replace them if necessary. Low fluid levels can cause strange noises when the AC is turned on.

I had a similar issue with my Ford S-Max and it turned out to be a problem with the AC clutch. I recommend taking your car to a trusted mechanic for a proper diagnosis and repair.