Which direction closes this heater hose valve?

mile marker 27 · Aug 10, 2025 at 8:03 PM

Big Road Skateboard said: ↑

You only have 2 valves, not 4, correct?

As @JB7 mentioned, you'll still have fluid in the hoses when shut off, and those valves don't always seal 100%
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Only two valves, correct. I think the rear valve is the one giving me issues. I think both valves are the same thread size so I’ll change both. Hose looks to be 5/8”.

mile marker 27 · Aug 10, 2025 at 8:07 PM

JB7 said: ↑

Are you saying that the hose is between the 2 valves in your pictures? Where do the other ends of the hose in your pics go to? Hose may still leak as there is fluid in it even if the valve is shut off.
You could pinch off the hose and remove it and put a plug in the end. Then check to see if the valve leaks. NO guarantee that it is completely stopping flow even in the off position. You can do this with either valve. The valve can also be taken apart by removing the piece marked with the red x which is threaded into the valve.
View attachment 565534
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Front valve’s hose runs back to the sleeper. Rear valve’s hose, runs to the heater core. They’re just making the big loop. I’m assuming, the flow is from the rear valve to the heater core, then to the sleeper’s heater core, then back to the thermostat valve, at the front of the engine.

Big Road Skateboard · Aug 10, 2025 at 8:30 PM

mile marker 27 said: ↑

Front valve’s hose runs back to the sleeper. Rear valve’s hose, runs to the heater core. They’re just making the big loop. I’m assuming, the flow is from the rear valve to the heater core, then to the sleeper’s heater core, then back to the thermostat valve, at the front of the engine.
Click to expand...

You are correct on the flow. Basically a supply side and a return side.

Though I've never seen one plumbed like that before. Sometimes a tee to the bunk on supply and return, but not routed through the front, to the back, and out the back to the return.

Kinda odd

J.R. · Aug 10, 2025 at 8:41 PM

They close from top and return to the set by Alt.

When I turn mine off, only do the ones top so allows for expansion but not pressure on system.

J.R. · Aug 10, 2025 at 8:42 PM

Flow not close opps

mile marker 27 · Aug 10, 2025 at 8:52 PM

Do you guys know, if that’s 5/8” male threads and 5/8” female threads, for the hose barb?

Big Road Skateboard · Aug 10, 2025 at 8:57 PM

mile marker 27 said: ↑

Do you guys know, if that’s 5/8” male threads and 5/8” female threads, for the hose barb? View attachment 565569
Click to expand...

Should be 1/2" pipe thread on both

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