Water flow problem, cold water only

Mrhavasu

Senior Member
Joined
Dec 24, 2015
Messages
173
Location
CA
Could use some help on this one, have a 2019 Momentum 348. Cold water suddenly has very low flow ONLY in the bathroom. The toilet, bathroom sink and shower. Hot water is normal.
The kitchen is all normal, hot and cold are both fine. Water pump or city water makes no difference. Prior trip all was normal. I did remove all the faucet heads and screens just to be sure,
but of course that made no difference since the hot flows just fine. I have checked the panel water valves at the inlet to make sure they are in the proper position over and over. I always
run a filter and all the valves seem to turn just fine. I am stumped.
 
Strange. The only thing I can think of is the cold water line to the bathroom has gotten kinked somehow. only way I can see that happening is movement of a slide but since the bathroom is not on a slide, I don't see how that could happen
 
Can you disconnect the cold water line from the faucet and see if you get better flow straight from the water line (into a bucket)? That would rule the faucet as the culprit or not.
 
Readers, please note the original post said problem affects toilet, shower and sink, only in bathroom.

About the only things could be a kinked waterline, or a leak. The latter should be obvious as that degree of pressure loss means a sizable leak evidenced by water coming from the underbelly. I’m not familiar with your model, but I’d be looking for shifted cargo in the basement storage impinging on a cold water line.
 
Readers, please note the original post said problem affects toilet, shower and sink, only in bathroom.

About the only things could be a kinked waterline, or a leak. The latter should be obvious as that degree of pressure loss means a sizable leak evidenced by water coming from the underbelly. I’m not familiar with your model, but I’d be looking for shifted cargo in the basement storage impinging on a cold water line.

Yep, not sure how I misread that, but you are on target.
 
I will be disconnecting water lines in the next few days and report back. Thanks everyone.
 
Only thing I can find so far is the water supply line going to the water pump is no longer round, kind of flat. Does not explain my problem, but I did heat that up and squeezed it back into
shape, I saw a you tube video where someone else had shared this. I tested all the water again and made sure that I had the valves in the correct positions. I have just returned home
from a trip where we drove 1300 miles back. I mention this because now the water flow is much better in the bathroom, still not like it should be, but much improved. I used a red solo
cup and timed how long it took to fill the cold vs the hot water into it from the Kitchen sink. Both cold and hot were 6 seconds. I went to the bathroom sink and the cold was 9 and the hot
was 7 seconds. This was done using the the water hose for supply and not the water pump. I had also slowly worked all the water valves back and forth. I was unable to see anything
that would appear to be a problem in the lines. No leaks or kinks were detected. Only thing I can think of is maybe there is a small obstruction in the cold water supply line going to
the bathroom, and it moved down from a fitting or other tight spot where it was causing a restriction while we were towing back home.
I have another trip in a week and will wait till after to do some more. I think I will isolate the cold supply line to the bathroom and try back flush it.
 
Curious also. I just drained all the water from the freshwater tanks and then the cold low point. I opened the bathroom faucets to let it drain back. Then I closed the faucets and
reconnected the hose water line. I opened the low point and let it run under pressure for a few minutes. Then shut it all off and reopened the low point and let it drain again.
I am done for now, leaving for a trip next week. Will see how it does and report back.
 
Late update,, water pressure is back to normal. After trying to remember exactly what we did
on our long trip at each campground, I think I got it mostly figured out. We only used the cold
water side the first and only nite we stayed at an older campground. We just used the toilet and
sink, never used the hot water there and did not do anything in the kitchen. Was a quick sleep
and leave early. I also did not use an external filter, just the factory installed one. I must have
picked up some fine sediment there. After flushing and letting it all sit for a few days, I drained
the low points again after my first set of posts, the first part of the water that came out of the cold water low point drain was brown followed by clear water. Only the toilet sprayer is not working like normal, it must be still have some of the fine sediment. The rest is back to normal.
Lesson learned, always run an external filter. My fault being tired and in a rush, I had the external
filter, but just did not use it that first nite.
 
Late update,, water pressure is back to normal. After trying to remember exactly what we did
on our long trip at each campground, I think I got it mostly figured out. We only used the cold
water side the first and only nite we stayed at an older campground. We just used the toilet and
sink, never used the hot water there and did not do anything in the kitchen. Was a quick sleep
and leave early. I also did not use an external filter, just the factory installed one. I must have
picked up some fine sediment there. After flushing and letting it all sit for a few days, I drained
the low points again after my first set of posts, the first part of the water that came out of the cold water low point drain was brown followed by clear water. Only the toilet sprayer is not working like normal, it must be still have some of the fine sediment. The rest is back to normal.
Lesson learned, always run an external filter. My fault being tired and in a rush, I had the external
filter, but just did not use it that first nite.
Sounds like you're getting it figured out so that's good. I found it more convenient to put a two cartridge filter mounted in the storage bay permanently connected so that when I use city water or fill the fresh tank it always goes through the filters first and I don't have to mess with one for each stop. The hose going to the filter inlet is the city water connection instead of the RV's city water connection. One less thing to deal with each stop.
 
I always try to remember to to run the campground spigot for even 5 seconds before hooking up, Ive seen some pretty dark water come out, especially early in the season.
 

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