Why does my 2015 ford fusion have high rpms when in park ?
You need to verify that the idle s actually high, it might just be perceived high, then if it is high then check for vacuum leaks around the engine compartment, all the vacuum lines, air intake tubes, etc. Might also be a good idea to at least check to see if there are any trouble codes stored. Most major parts stores can do this for free. make sure you write them down and repost them back here and someone will jump in and help you with further diagnosis.
Sometimes with the A/C on, at idle the electric cooling fan(s) are running and at times they can sound like the engine is racing, but it is just the fan(s). If you have a tachometer (RPM gauge) what is it showing?
Which engine and what are you calling high and what engine? Stock idle for the 2.0 is around 700rpm, AC on may bump it to 800+.
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