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Old 01-27-2022, 02:02 PM   #1
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Heater control valve - identification and repair

The RV is a 2002 National Tradewinds LE 390, Spartan chassis with a Cat 3126e. After running up to temperature and stopping I have been noticing a small puddle under the right front. It appears to be anti-freeze.
Yesterday I crawled under and took the picture below. Anti-freeze can be seen on the connection.

I would appreciate any pointers on identification, manufacturers, and replacements. I am not even sure of the means of operation. Are they purely mechanical or are they electric and 'motor' driven?

Thanks, Dan
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Old 01-27-2022, 05:29 PM   #2
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There are 3 types 12V electrical controlled and cable-controlled, however vacuum controlled are the most commonly used. Does yours have one black 1/8" hose to it or 2 wires?
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Old 01-27-2022, 06:13 PM   #3
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I blew pic up on PC looks like wires/plug left side bottom. I'm suspect of "what's going on" with 3 hose clamps on one hose on topside. Might be an extra elbow that would need three, but doesn't look like it. The cable driven valve could leak valve stem packing seal, but electric is more sealed. I suppose it could crack or degrade.
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Old 01-28-2022, 07:55 AM   #4
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Thank you for those leads. I will remove the tie straps and take move pictures. This is in a semi reasonable place to access.
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Old 01-28-2022, 08:56 AM   #5
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Dan while you're in the front cap , see if you can get a look for the brand name on the HVAC housing .
I believe your set up is Evans/Tempcon , but you need to be sure for part supply .
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Old 01-28-2022, 11:11 PM   #6
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Looks like I'm seeing some dried residue on the three clamps on top as well. Do you have enough slack to cut that back and re-install . By the looks of it ,first thing I would do/ look at. Fixed more than a few leaks just cutting a hose back to better rubber.
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Old 01-28-2022, 11:18 PM   #7
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Hard to be say by that picture. Could be as simple as tightening clamps.
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Old 01-30-2022, 12:22 PM   #8
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Are the main water lines from the engine forward steel or rubber?

I would imagine the main lines are steel tube. If that is the case then the I can look for the joint and replace the connector section.
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Old 01-31-2022, 08:14 AM   #9
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I'm not positive about Spartan chassis , but Freightliner uses hoses from the engine to the front . Too many twists and turns for metal tubing .

Replacement is fun .....NOT!
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Old 01-31-2022, 09:35 AM   #10
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IF this valve is the one I think it is, you can get the valve itself without the actuating motor easily.

I actually probably have a new spare in my parts stock in the shop, though that won't help you very much!

Valve is not terribly expensive either.

I'd suggest removing it and taking it to a good parts store and see if they can match it up. (I'd suggest Advance Auto or NAPA...)
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