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Old 12-17-2011, 08:48 PM   #1
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Motor-aid auxiliary heater

2002 sightseer , the auxiliary heater is located under the rear queen bed, i have managed to get the fan working but there is no hot water reaching the unit, is there any valves in the system or could it be an airlock. Any advice would be appreciated .
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Old 12-17-2011, 09:43 PM   #2
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I had the same problem in my former Itasca 37G. Dealer located problem under the refrigerator. Apparently something had kinked the line and the coolant could not flow. Also in the same spot the coaxial cable had been damaged. So two problems solved at the same time.
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Old 12-17-2011, 10:00 PM   #3
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DID that involve removal of fridge ??
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Old 12-18-2011, 05:34 AM   #4
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Yes, they removed the fridge. Also I asked them the same question you asked, was there a shut off up at the engine. The answer was "no".
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Old 12-18-2011, 08:07 AM   #5
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We have had two problems, One was a valve that is called . H valve It wasn't doing its job. Another was A shout off valve was next to the engine ,this is the case on our Ultimate;. The routing normaly Goes from the engine Waterpump, To the Up front heater, Next to the water heater, Then to the rear bedroom heater. And the engine must be completly warmed up. And the water must flow through the complete loop. Unless there is an H valve installed at that unit. With the H valve you can Bypass one unit and the water still flows in the loop;;
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Old 12-18-2011, 12:55 PM   #6
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Found the problem, traced pipework from rear heater to water heater to front of coach under doghouse and found pipework laying across engine not connected to anything , according to original owner "it never worked" NO sxxx !!!
If any one can post photos or give advice on connections it would really help
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Old 12-18-2011, 01:23 PM   #7
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Have sent photo to Winnebago asking for instructions on how to connect to engine coolant system , if anyone can send photos or help [email protected]
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Old 12-18-2011, 01:26 PM   #8
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A drawing of the connection of the 2 hoses at the engine is shown on the bottom right of pdf page 120 on your 2002 Sightseer WPD27C parts diagram http://www.winnebagoind.com/service/...GO/2wpd27c.pdf (Both Workhorse and Ford Chassis versions are addresed). The 5/8" hoses (reffered to as item 17 [see list on following page]) connect to the 2 "tees" (Item 16). All of these items are installed when the Motoraid Option is installed. The tee's are inserted into the front dash heater hose lines. You can purchase standard 5/8" copper tees and the clamps to install them at any normal auto supply house.

From a post I made on another forum:
Because motoraid heats both water heater and rear register, water is allways flowing through hoses (no valves along the way). Hose to water heater input connects to a tee in the intake manifold to front dash heater hose. Water heater output hose goes to input connection on rear heat exchanger (fan motor control on dash). Rear output hose goes back to engine radiator. If rear heater is not getting hot then there is blockage or someone installed a shutoff valve. While the front dash heater has a vacuum controlled valve, the motoraid bypasses that so water heater can be heated in summer or winter.

I do not know why, but I understand for several years now, Winnebago only installs the motoraid feature on gas rigs, not diesel. Some diesels may have a variation of this if they have a Aqua-Hot (formally called Hydro-Hot) system. However, do not take all that as an absolute because things do change at times

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Old 12-18-2011, 01:36 PM   #9
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Dave thanks for quick response , just looking at drawings now , will try to locate best place to break into pipework to make connection , again any advice or photos would be greatly appreciated
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Old 12-18-2011, 05:22 PM   #10
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trying to identify pipes and best point to tee off
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Old 12-18-2011, 06:03 PM   #11
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As far as best point, that is just something you have to look at current routing of the dash heater hoses and decide where. The only thing I could pass on is ensure the tee points are on the engine side of any flow control valves. That way the valves do not control the flow of water to the rear heat exchanger.

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Old 12-18-2011, 09:24 PM   #12
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Sorry for being dim witted "flow control valves" recognize there is mechanical thermostat on top of engine controlling flow to radiator and dash heating matrix , beyond that, i am confused.
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