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Water temperature fluctuations

While showering I notice wild temp fluctuations from extreme hot to cold. Is this the tempering valve that has to be adjusted? If so which way do I turn it ?
Peter    Alberta Canada
'98 U320 40'  Build 5359 M11 450 HP, Aqua hot, Blu Ox

Re: Water temperature fluctuations

Reply #1 –
I would think the valve is sticking and needs to be cleaned out if that is possible.
Peter and Frieda Morin
1999 36ft. U320 Foretravel
Build # 5436
1998 Suzuki Sidekick Sport

Re: Water temperature fluctuations

Reply #2 –
Rudy should be by here in a few.  He is the guru with regards to Aqua Hots!
Joe & Dottie Allen
Sold!  December 2023.      2000 U320; build # 5645
Our coach " Maxine"
Motorcade #  15922;  Escapee 150950; FMCA F330833; Boondockers Welcome;  Harvest Hosts;  Thousand Trails
'98 U320 from 2000-'06
USAF '62-'66

"Do not spoil what you have by desiring what you have not; remember that what you now have was once among the things you only hoped for." ―Epicurus

Re: Water temperature fluctuations

Reply #3 –
Peter,  Turn the tempering valve all the way each way 3 or 4 times.  Return to where you started or midway.

Righty, tighty is cooler.  Lefty, loosey is warmer.  Adjust 1/8 to 1/4 turn till happy with temp.  I set it to between 115 and 120 with a meter.

If this does not fix it, get a new valve from the internet.  Just unscrew the nut holding the valve in the body and replace the guts.  No need to solder the new body into place.
Rudy Legett
2003 U320 4010 ISM 450 hp
2001 U320 4220 ISM 450 hp
1995 U320 M11 400 hp
1990 Granvilla 300 hp 3208T
Aqua Hot Service Houston and Southeast Texas

Re: Water temperature fluctuations

Reply #4 –
The RV specialist who replaced my coils replaced the tempering valve(new) it should not be sticking so I will adjust it (righty) and turn the hot down. Will this solve the hot to cold hot to cold thing though?
Peter    Alberta Canada
'98 U320 40'  Build 5359 M11 450 HP, Aqua hot, Blu Ox

Re: Water temperature fluctuations

Reply #5 –
On our last trip my wife and I noticed a temperature fluctuation that kinda coincided with the pump.
I'll try exercising the tempering valve .
Frank & Daisy
NO LONGER  "looking for the perfect Foretravel
36' or less non slide preferred."  She has been found and is ours.
2003 U320 36' non slide  Unit 6103
Cummins ISM 450
Allison 4000MH

Re: Water temperature fluctuations

Reply #6 –
It could also be the shower cartridge that's going bad if it's only the shower doing that.
You could possibly remove the cartridge and soak it in vinegar then reinstall and see if that works.
Forest & Cindy Olivier
1987 log cabin
2011 Roadtrek C210P
no longer 1999 36' U320 build #5522
2013 Rzr 570 & 2018 Ranger XP1000
2006 Lexus GX470
2011 Tahoe LT 4x4
Previous 1998 45' 2 slide Newell, 1993 39' Newell

Re: Water temperature fluctuations

Reply #7 –
Thanks Forest
Frank & Daisy
NO LONGER  "looking for the perfect Foretravel
36' or less non slide preferred."  She has been found and is ours.
2003 U320 36' non slide  Unit 6103
Cummins ISM 450
Allison 4000MH