Can someone tell me where the hot water heater bypass valves are on a 2003 29ft. Hi Lo classic.

Check under diningroom benches. They are usually close to the pump.

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"Ruben"
2404T, 2003 2500HD 4X4 GMC Sierra SLT Crew Cab w/Astro camper shell and 2003 Chevy Tahoe LE 4X2
Far West Texas

I thought they be on the backside of the water heater ,to isolate the WH from the rest of the plumping

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Les & Patricia
2006 22ft towlite (replaces 97 21TL)
2006 Toyota tacoma pre-runner 4.0 L V-6 quad cab
w/ 98 chevy Powervision towing mirrors
2017 Chevy Silverado 1500 5.3 v8 (replaces Toyota)
2 Hobie mirage pedal drive kayaks

You might be right, Les. I may be thinking about the winterizing cutoff so you don't get fluid in the tank.

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"Ruben"
2404T, 2003 2500HD 4X4 GMC Sierra SLT Crew Cab w/Astro camper shell and 2003 Chevy Tahoe LE 4X2
Far West Texas

The water heater on this model is on the back driver side corner. The bedroom is back there as well and I cant find any access to the back side of it.

You might be thinking about the drain valves to drain the water lines and the supply line has a check valve on it so you don't fill the fresh water tank when hooked up to campsite water. Some older hi-lo's like my 97 towlite never had a hotwater heater by-pass valve system.

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Les & Patricia
2006 22ft towlite (replaces 97 21TL)
2006 Toyota tacoma pre-runner 4.0 L V-6 quad cab
w/ 98 chevy Powervision towing mirrors
2017 Chevy Silverado 1500 5.3 v8 (replaces Toyota)
2 Hobie mirage pedal drive kayaks

Is there a cabinet with a false wall that be hiding it?

__________________
Les & Patricia
2006 22ft towlite (replaces 97 21TL)
2006 Toyota tacoma pre-runner 4.0 L V-6 quad cab
w/ 98 chevy Powervision towing mirrors
2017 Chevy Silverado 1500 5.3 v8 (replaces Toyota)
2 Hobie mirage pedal drive kayaks

Open the door to the nightstand, get on your hands & knees and look back under the shelf inside. At least that is where mine were located.

Bob

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2014 FR Heritage Glen 282RK
2013 F250 HD 6.7L Diesel
Formerly Owned: 1995 22D Fun Chaser & 2901L Classic

Thank you fellows so much for your quick response and help. Bob the prize goes to you thats where it was at. This is our 3rd Hi-Lo and the first one I've seen with the valves in the night stand.