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Old 02-13-2015, 10:39 AM   #1
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Question Heating

HR Neptune 35SBD 2009, Cummins 340/Allison 6

The heat available from the motor at the front of my coach is in a word pathetic. While I live in CA and its not really cold on a chilly morning it can be useless even with the engine thoroughly warmed up and on the freeway. The good news is the engine AC is really effective on hot days.

Next year I am planning on going almost full time and it would be nice to have an effective heater for those chilly days along the coast as well as defrosting quickly etc. Of course I can run the house heater or genny and
heat pumps etc.

I have seen references to booster units bypass valves etc. but never really paid attention before now. I have checked the control valve and it is operating as it should and the water passing through is almost too hot to hold but way cooler than the actual engine water temp. I also checked all the lines/hoses and there are no kinks or blockages Even with approx. 35ft of travel I would imagine the water would be hotter due to the heavy duty rubber hose

Does anyone know of a real cure for the heat loss from engine @ rear to the front of the coach?

Mike
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Old 02-13-2015, 10:56 AM   #2
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sounds like your blend door is not working it should close off the a/c side of the unit take heat gun and find out how hot your hose is at the front of your coach. there is a vacuum pump that makes it all work.
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Old 02-13-2015, 03:49 PM   #3
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If your heater core has not been used for a long period of time, It may need to be backflushed. Over the years I have seen a few heaters that were clogged partially or fully.
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Old 02-14-2015, 09:30 AM   #4
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Agree with Grey Ghost I, if you think everything else is OK I would try and flush the heater core.

I have a vehicle that had the same problem and when I finally decided to check the core, I back flushed and got trash out of it when I back flushed in the opposite direction of coolant flow. The heater now puts out much more heat.
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Old 02-14-2015, 09:44 AM   #5
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On an old bus we converted to a MH we wrapped the heater hoses with insulation. It really helped.
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Old 02-17-2015, 10:53 AM   #6
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Thanks all for the advice, I will try back flushing. I had to replace the vacuum operated controller due to the fact the box drain was plugged by trash left in at the factory and it was sitting in water for 2 years


Thanks for your suggestions
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Old 02-18-2015, 06:16 AM   #7
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Please let us know the outcome.
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