Welcome aboard!
Is this hissing noise coming from the Hot Water Heater compartment outside? perhaps the heater plug is not tight enough and the heater is bleeding off built up air or water pressure?
Or if inside is one are one of the winterization valves on the HWH partially open? Once again bleeding off pressure?
I don't know how you de-winterize, I leave my HWH valves in winter position (don't want pink crap in the heater) and hook up the air compressor to the city water inlet. I build up around 40 psi and open valves staring farthest away in the bathroom and blow the pink crap out of the lines, working back to the kitchen sink last.
There is plenty of hissing and pressure bleeding off while I do this.
Good luck with the search.
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2018 ACE 27.2
Toad 2019 Jeep Cherokee Trailhawk
Roadmaster Falcon All Terrain Towbar
Roadmaster Invisibrake
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