Papa-T. Glad you posted that picture. Now the explanation - Some by-pass systems use 2 - 3 way valves. In your picture on the red and blue lines that run horizontal where the "Tee" is there would be a 3 way valve in both the red and blue lines and no valve in between them in the vertical red/blue line. To use the water heater you turn both 3 way valve handles horizontal or pointing at the water heater. To by-pass turn the valves so they point at each other. The antifreeze comes in the blue line hits the 3 way valve turns and goes up to the top 3 way valve then turns and goes out on the red line Bypassing the water heater.
Not sure if that is his set up but it would explain no valve in the vertical line.
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2009 Seville VF32KS
2019 GMC Sierra 3500HD Crew Cab Denali.
6.6 Diesel standard box.
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