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Old 10-19-2015, 06:22 PM   #1
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Question Internal radiator removal

I have a quick question.

My bus has two internal radiators, one in the front next to the driver's seat and another one about midway through the bus. There are two large blue tubes that connect these internal radiators to the engine. Underneath the bus, near the engine, each line has a separate shutoff valve.

If I wanted to remove the internal radiators and the blue coolant lines, should I simply remove the tubing and shut off the valves, or should I connect the two ports together to form a loop?

(Or to phrase my question another way: are the internal heaters connected in series or in parallel to the engine cooling loop?)
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Old 10-19-2015, 07:57 PM   #2
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Form a loop.
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Old 10-20-2015, 07:18 AM   #3
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They're in parallel. You don't really 'need' the coach heaters to keep the bus from overheating (but that added cooling capacity can help you out when you're in a bind). I chose to keep the heater by the driver's seat and get rid of the heater in the back of the bus. That way my defogger works in the rain, and it might keep me warm-ish when driving in the winter time.

Underneath the driver's seat (under the bus) there were two lines running from the front heater to the rear heater. I cut those lines and reused some of the fittings from the rear heater to help make connect the two lines I cut.
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Old 10-20-2015, 08:13 AM   #4
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They're in parallel.
You really need to check, mine were in series.
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Old 10-20-2015, 08:27 AM   #5
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The coach heaters are in series with each other, but in parallel to the radiator for the engine. Or at least mine were. There are 4 lines. 2 go to the radiator in front of my engine. The other two have some valves on them and go to the coach heaters.
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Old 10-20-2015, 08:30 AM   #6
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Come to think of it, I don't think I opened those valves back up after I rearranged my coach heaters. I might ought to open those before winter.
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Old 10-20-2015, 08:32 AM   #7
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If they were in series, those closed valves would close off my loop and my engine would be overheating.
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Old 10-20-2015, 09:01 AM   #8
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Mix up on words. Radiator cools the engine, hoses are at least 2" on a bus, I've never seen a shut off on a radiator hose. Heater or heater core, heats the interior and gives warm air for defrost, hoses are probably 1" on a bus. Probably heaters are in series. On a RE you can take out the rear heaters, but hoses must go all the way to the front for heat/defrost. On a FE you can take out the rear heaters and hoses that go to them, you must close the loop, hook the hoses together where you cut them.

Dick
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Old 10-20-2015, 09:15 AM   #9
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I've never seen a shut off on a radiator hose.
Yeah, I don't have a shut off for the radiator, it's just on the heater hoses. I was puzzled at first looking at the engine and wondering "what are those water hose spigot looking valves?"
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Old 10-20-2015, 12:16 PM   #10
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I've seen a few people with rear engines cut/remove the heater core lines going to the front of the bus. I won't be driving my bus much, and I'm not so worried about the heater functionality, but I am concerned with the defrost option. Is it worth keeping the 1" lines to keep defrost capability, or is there a suitable alternative when it comes to defrost?
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