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Old 11-29-2017, 10:37 AM   #1
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Help me with my unidentified coolant parts?

This is the post about another unidentified object I found underneath my skoolie. Any help is appreciated, near the front, next to the fuel tank. It’s metal and feels like it cracked/broken at one end.

Thanks for any help you can offer.

1989 GMC Thomas 60 military bus.
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Old 11-29-2017, 10:48 AM   #2
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Does the engine oil, coolant or exhaust go thru it? Looks like something used to heat or cool another liquid.
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Old 11-29-2017, 10:55 AM   #3
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I was thinking the same thing. I thought somebody with a little more experience might Be able to identify this. Maybe it’s standard?
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Old 11-29-2017, 11:13 AM   #4
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I’m gonna go take some more pictures. I have a feeling this is connected to my other on identified listing, hmmm.
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Old 11-29-2017, 02:52 PM   #5
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Well, I decided to keep looking at this item until I had some insight. I found out that those wires running to each and run to a 110 V outlet on the outside of the bus.

From the same box that came from there is another electric line running to the front of the bus. I haven’t followed up with that when yet.

I believe you are right that this is a heating unit or some type of valve. The 110 V jumps from the front to the back.

Another interesting thing is if I squeeze the anti-freeze hose I hear something that sounds like a valve flipping around.

The anti-freeze from this unit runs into a cylinder that looks like it heats up the diesel fuel. It says not to run it in the summertime, but to have a valve on it? It’s the last picture.

Anybody else has any idea what this might be for sure, I hope they will chime in.

-Lewis
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Old 11-29-2017, 03:04 PM   #6
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Is that some type of heat exchanger to keep the fuel from gelling in really cold weather? Might be if a military built bus. Definitely worth more inspection and if good I would leave it.
I talked to a trucker once who wanted diesel for a fillup but it was so cold the fuel wouldn't pump. With windchill it was said to be -68f in northern Quebec. My very last trip into that country forever.

Your pics don't give much clue so just follow the lines I guess. Someone here has seen that setup before likely.

My 2 cents,

John
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Old 11-29-2017, 03:06 PM   #7
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Cowlitzcoach isn't on as much anymore, but he'd know what it is.
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Old 11-29-2017, 03:18 PM   #8
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That pretty much sounds like a block heater. It dose look like a heat exchanger of some type.

If your hoses are quite soft you should probably look at replacing them before you attempt any deserts.

You know the old saying, "If it ain't broke, don't fix it." Plug that baby in for a minute or so to see if it heats up, or sparks fly or whatever. I'd bet it still works.
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Old 11-29-2017, 03:43 PM   #9
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Hello Robin,
I think it for heating. There is another 120v headed to the front. I’ll look at it tomorrow, but likely for the block. I was able to squeeze the hoses so easily, since they are made of silicone?! They are braided and all, just easy to squeeze.

I may need to do the plug and see method.

Thanks for your input!
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Old 11-29-2017, 03:46 PM   #10
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The picture that looks like A can, yes that’s what that is. It’s the black thing that has 120 V running to it. I’m guessing it’s a heater of some kind as well. We’re planning on moving to Kansas, further weather doesn’t get too extreme.

Unit has a crack at one end as well. Thinking of cutting it off and just joining the two ends for circulation. Just leave everything else in place.
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Old 11-29-2017, 04:03 PM   #11
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There's been mention of pumps in the coolant lines on the long buses to better provide heat to the rear heaters. I don't know what they look like though. Is that unit on the line that goes to the rear heaters?
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Old 11-30-2017, 07:21 PM   #12
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Originally Posted by meyermobile View Post
This is the post about another unidentified object I found underneath my skoolie. Any help is appreciated, near the front, next to the fuel tank. It’s metal and feels like it cracked/broken at one end.

Thanks for any help you can offer.

1989 GMC Thomas 60 military bus.
It's a secondary pump. Sometimes called a heater booster. Water lines go to the heaters ( heart exchangers) in the bus. This is a secondary pump to get warmer water inside the bus.

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Old 11-30-2017, 07:39 PM   #13
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If you're removing your rear heater, like most of us, you won't need that pump anymore.
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Old 11-30-2017, 08:03 PM   #14
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If you're removing your rear heater, like most of us, you won't need that pump anymore.
I'd leave it. It'd make a cool fountain--- or just plumb it right into the bath tub for mobile Jacuzzi.
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Old 11-30-2017, 08:05 PM   #15
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that little pump saved me a TOW BILL! a couple months ago... blew an idler pulley bearing.. water pump belt gone.. heater pump on, heater fans on.. start the bus ran it up to 40 MPH, killed the engine.. coasted.. that little pump keeping coolant in my engine flowing.. heaters taking off the heat... made it to a service center without a tow... and engine temp never over 207
-Christopher
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Old 11-30-2017, 08:06 PM   #16
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that little pump saved me a TOW BILL! a couple months ago... blew an idler pulley bearing.. water pump belt gone.. heater pump on, heater fans on.. start the bus ran it up to 40 MPH, killed the engine.. coasted.. that little pump keeping coolant in my engine flowing.. heaters taking off the heat... made it to a service center without a tow... and engine temp never over 207
-Christopher
That's smart thinking

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Old 11-30-2017, 09:25 PM   #17
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That's smart thinking

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you know how it is if you break down on the road.. you try and think of EVERY WAY to avoid that big-boy-tow-hook... LOL
-Christopher
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