1996 Holiday Rambler Plumbing problems

[hoakieman]

Hi Folks, I have a wonderful old Alumilite. I think its 30feet, but can't find where its listed. There is some kind of pink fluid, (I think antifreeze in the water tank), I need to drain and clean the whole water system, but can't locte where the drains are? Also I can hear the pump running, but this unit is so tightly closed up, I can't find an access to the pump. I have the owners manual, but its not specific.
There is near the back door under the closet a cover that says Drains, with three valves in it, but when I turn them nothing happens except that one is leaking.
Can anyone help? I don't want to start cutting into the aluminum undercover on the bottom.
any links or advice is appreciated,
Thanks,
Hoakieman

[jacwjames]

Usually the drain is located fairly close to the fresh water tank. Look underneath and see if you can see any type of nozzle or pipe protruding from the under the coach, then find the closest access and see if you can see a valve.