Re: Mystery water leak on my 1990 Granvilla
Reply #13 –
OK, here goes.
In the compartment between the front seats are two valves. The left valve should only be turned on to fill the fresh water tank, then SHUT OFF. If you leave it open the fresh water tank will continue to fill then overflow if your supply hose is still supplying water to the coach. Also, if the supply hose is disconnected and the valve is left open your 12V onboard pump will keep pumping/trying to build line pressure, not knowing that you have left an open line to the fresh water tank.
The right valve is only opened to drain the fresh water tank buried just forward of the little compartment. The drain hose is almost directly below this valve.
Label these valves: Left valve TANK FILL. Right valve: TANK DRAIN.
On the water heater (or boiler as you call it) the top right valve IS a pressure relief valve. Down to your left, tucked behind the gas supply line is the heater drain fitting, should be a white nylon plug. If you have a petcock instead you run the risk of shorting the coil on the gas control unit. A new one cost me $87 plus shipping (US) so yours will probably be a lot more.
Might I suggest you get a 1/2" x 3" pipe nipple and an inline coupler and install them. I used white Teflon tape and I ground the outside diameter of the coupler so I wouldn't have to bend the two bayonet fittings down very far to clear the coupler. You can then reuse your nylon plug and this new arrangement will just clear the inside of the louvered compartment cover/door.
Now, your two mystery hoses. I extended the hoses on our coach down below the compartment bottom to prevent what I see in your picture. RUST!! I hate rust even tho we live in the rust capitol of the US. I also labeled the system drain valves under the couch with tags reading: HOT WATER DRAIN and COLD WATER DRAIN.