1998 Hi-Lo 21 footer.
How water just a trickle - hot, normal flow for about 10 seconds, then goes to a trickle.
Cold water pressure fine.
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You MAY have the winterization valves, or one of them, in the bypass position. You can check your owner's manual for the correct orientation. Other than that, I can't think of any reason for good water pressure on one side and not the other.
- Jack