2007 Allegro bus 40' low water pressure on cold side

[modelworks]

hi everyone,
I have a 2007 Tiffin allegro bus 40QSP?
The cold side of the water is very low pressure the hot side has full pressure.
Already replaced the water pump, blew out the cold side from the low drain to the kitchen faucet came thru with full air. when we blow air thru the cold side kitchen to the low drain nothing comes out, I hear it coming but it is clogged somewhere. Is their a 1 way valve that I cannot see. the shower in the water/septic bay has full cold and hot pressure. We have cleaned all of the strainers and replaced the filter. any ideas
thanks in advance
John G

[Shawn Cole]

Originally Posted by modelworks

hi everyone,
I have a 2007 Tiffin allegro bus 40QSP?
The cold side of the water is very low pressure the hot side has full pressure.
Already replaced the water pump, blew out the cold side from the low drain to the kitchen faucet came thru with full air. when we blow air thru the cold side kitchen to the low drain nothing comes out, I hear it coming but it is clogged somewhere. Is their a 1 way valve that I cannot see. the shower in the water/septic bay has full cold and hot pressure. We have cleaned all of the strainers and replaced the filter. any ideas
thanks in advance
John G

Good Morning John,

We are working on trying to get a layout of your water system. To me, some of the processes you state you have performed it a bit confusing, such as being able to blow air from low point and it come through the galley faucet, but it will not in reverse. As soon as I have the layout, and we are able to trace those water lines we may be able to eliminate certain variables.

Is the Galley faucet the only fixture that you are having this concern at? You state the outside shower has full pressure hot and cold. We are curious about the other fixtures inside the motorhome.

[modelworks]

thank you a diagram would help. When we blow air from the low point drain to the farthest faucet kitchen, air blows thru just fine. when we blow air from the cold side under the kitchen sink it does not blow thru as if their is a check valve somewhere. this is affecting all three faucets in the coach.
next thing were going to try is making a proper adapter and try all of the sinks by running air thru them.

[modelworks]

hi shawn,
Any luck on finding the plumbing diagram?

Originally Posted by Shawn Cole

Good Morning John,

We are working on trying to get a layout of your water system. To me, some of the processes you state you have performed it a bit confusing, such as being able to blow air from low point and it come through the galley faucet, but it will not in reverse. As soon as I have the layout, and we are able to trace those water lines we may be able to eliminate certain variables.

Is the Galley faucet the only fixture that you are having this concern at? You state the outside shower has full pressure hot and cold. We are curious about the other fixtures inside the motorhome.

[ernieh]

The Tiffin coaches that I have owned only filter the cold water. I'm not sure why, but that's how the were plumbed. Have you tried removing your water filter?

[accsys]

Originally Posted by ernieh

The Tiffin coaches that I have owned only filter the cold water. I'm not sure why, but that's how the were plumbed. Have you tried removing your water filter?

That would be my suggestion as well. If you have replaced the filter recently with one that is less than 5 microns, it will also reduce water flow. The 5 micron filter is adequate and will give good water flow.