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Old 11-26-2021, 11:02 PM   #1
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Rear Engine Heater Lines Loop Install

I temporarily want to run a loop on the heater cooling lines while we rerun the heater lines under the bus. We are keeping the 2 heaters in the front (under driver seat and defrost) so to help with cooling in hot climates. Do I just need to loop the hoses together before
or after the pump that they run to? Please see picture for reference and my poorly drawn lines.

Also the valve in the picture doesn’t seem to close all the way. These valves I believe are already turned off but I think it’s open a bit and coolant is still able to flow in that circuit. Is that normal?

The main valve I see on top of the engine is turned all the way off.
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Old 11-27-2021, 04:41 PM   #2
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if you have gate valves then yes they probably do not close all the way because of sediment caught in the gate slide.
i would replace them with full port ball valves myself.
loop the lines after the tee's that feed the heaters you want to keep.
sorry just looked at your picture and that is a ball valve that is not shut off period.
the square side of the handle stem shows that it is open.
i dont your specific cooling system because i have never had a coolant pump system.
and thought the extra coolant pump only fed the rear heaters?
i stand corrected
i was replying to your first post and the pic showed up on second post.
sorry
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Old 11-27-2021, 04:44 PM   #3
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So this is a rear engine bus with these lines going to the front heaters. I’ve removed the rear heater and looking to just keep the heater under driver and defroster. I’m currently taking out the loop I rigged up yesterday and just bought new lines to rerun to the front. I also just bought a new handle so I’ll see about shutting that valve fully
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Old 11-27-2021, 05:11 PM   #4
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I assume this one is turned off though right?
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Old 11-27-2021, 05:42 PM   #5
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yes looks like it.
while you are working on the system then i would recommend changing those valves for ones more user friendly
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Old 12-03-2021, 10:42 PM   #6
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Anyone have advice for non functioning heater? While parked, no heat comes on. Ive opened all the valves and nothing happens. I have a 1995 International 3800 dt466. Please help!
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Old 12-04-2021, 11:18 AM   #7
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The pump aides in pushing the coolant to the front of the bus. You'll need it if you retain the front heaters on an RE.
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Old 12-05-2021, 11:12 PM   #8
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Quote:
Originally Posted by JSquire7 View Post
Anyone have advice for non functioning heater? While parked, no heat comes on. Ive opened all the valves and nothing happens. I have a 1995 International 3800 dt466. Please help!

That booster pump you have has gone out or the relay in gone out
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Old 12-06-2021, 06:22 AM   #9
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a 3800 model indicates front engine.. do you have heat while the bus is moving or the engine is revved up? is your temp gauge moving up at all? when you say parked im assuming parked and engine idling?
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Old 12-06-2021, 12:43 PM   #10
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Yes I apologize Indidnt realize this was a rear engine thread, I have a front engine. I don’t seem to get heat whil the bus is running/idling while it’s parked. I have tested my gauges (by switching them around the instrument cluster and all gauges work). My operating temperature remains at 100 whole idling for 20 minutes. Could this be a thermostat problem?
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Old 12-06-2021, 12:59 PM   #11
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possibly.. what does it get up to driving around town? does it ever warm up if you have the heater fans turned off and idling?



at 20 minutes of idling with no heater fans on my DT360 does warm up to someplace between 100 and 180 mark on the gauge.. with heater fans on it takes much longer..
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Old 12-06-2021, 01:00 PM   #12
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driving around town with heater fans off or valves closed my DT360 gets to 180 within 15-20 minutes..
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