I am sure you meant rt rear panel. That would be the expansion valve hissing. It may be an indication of low refrigerant BUT you need gauges hooked up first to be sure.
The hissing is: High pressure liquid refrigerant going thru the valve, becoming low pressure gas feeding into the...
May need a Motorcraft replacement Neutral Safety Switch:
https://www.rockauto.com/en/catalog/ford,2000,expedition,5.4l+v8,1362439,electrical-switch+&+relay,neutral+safety+switch+/+range+sensor,4584
Try this from eBay: https://www.ebay.com/itm/Ford-Expedition-2009-2010-2011-Factory-Workshop-Service-Repair-Manual/174308636354?hash=item28959ab6c2:g:xo4AAOSw8e5a-Mos
If it ain't shedding water, it ain't working right. I added a short 3-4" hose on mine since we have potter wasps that live to plug up any holes to lay eggs.
Check rockauto.com, they do have a variety + Motorcraft. Look here: https://www.expeditionforum.com/threads/rockauto-introduction-discount-code.12944/ for latest discount code
Check rockauto.com also. That hose is not cheap but repair is cheaper if you do it yourself. I have gone to using silicone vacuum line myself like the imports. Resists heat & oil much better
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