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HVAC, Air Conditioners, Aqua Hot, Primus, Webasto, Chassis Heaters, Furnaces and Water Heaters Questions and information about the wide variety of Heating and Air Conditioning as well as Water Heater systems available are discussed here.

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  #11  
Old 12-11-2011
Stephen Stephen is offline
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I case any one is interested I have a quantiy of NEW 12volt Convectors
Suitable for retrofit or new installations
They were produced for M450
2 pancake fans compact
$60.00 plus shipping
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  #12  
Old 12-12-2011
Itchintogo
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I have front heat but no chassis heat. I suspect a sporlan valve may be stuck. There are a couple at the rear of the coach close to what looks like 2 vane pumps.

That sound like a reasonable place to start?
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  #13  
Old 12-12-2011
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giderich giderich is online now
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Gary, be sure the gate/globe valves are turned to the ON position.
Additionally the winter/summer switch to the ON position, and the switches at each chassis heater to the correct settings; the suburban wall thermostats need to be turned ON and set to the desired temp.
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  #14  
Old 12-12-2011
Itchintogo
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Hey Dick,

Check, check and check. All those things are on for sure. But no heat so this is why I am suspecting something is keeping the water form flowing through that loop.

My first thoughts are either a valve or a power issue.
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  #15  
Old 12-12-2011
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We had a similar problem in our chassis heat, the rear gates were open but still no heat. Finally the problem was solved by replacing one of the gates as it was all plugged up so the the circulation was cut off at that gate. Replaced and have heat. Good luck.
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  #16  
Old 4 Weeks Ago
Spowell75 Spowell75 is offline
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Does anyone have the part Number for the coolant pumps? Both of mine are not working.
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  #17  
Old 4 Weeks Ago
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Quote:
Originally Posted by Spowell75 View Post
Does anyone have the part Number for the coolant pumps? Both of mine are not working.
I have this on my list to work on in the next month before my trip to Texas. I have my old pumps pulled out and I was looking at these pumps to maybe replace the originals:

https://www.amazon.com/Bosch-Automot...CC8JBXER7B83JX
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  #18  
Old 4 Weeks Ago
Bruce Bruce is offline
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The bus parts warehouses have the original pump. Used on school buses.
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  #19  
Old 4 Weeks Ago
badandy badandy is offline
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The Bosch pump Jeff posted is a good one to use. I wouldn't go back to the original pumps, they aren't superior in any way. Beware they have 3/4" hose connections and the chassis heater hoses are 1", so use an adapter. No problem doing this.

I studied the flow when I redid all mine, and what I learned was that if you have low temp thermostats, like a 170, and a correctly spec'd fan temp switch, like a 180 or higher, you'll get lots of hot water flow through both chassis heater circuits because the thermostats are wide open almost all the time. If the thermostats are closing a lot then you might need the pumps running to get hot water moving from the hot parts of the engine. That's when it's really cold, below freezing.
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  #20  
Old 4 Weeks Ago
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Quote:
Originally Posted by Spowell75 View Post
Does anyone have the part Number for the coolant pumps? Both of mine are not working.
If you do want to stay with the original pump it is a Groco CP-20-BB. It's pricey compared to the Bosch, but I think it moves 17 gpm. Don't know what the Bosch does. As Bruce said, they are available from bus parts suppliers (https://www.unityparts.com/cp20bb-br...ster-pump-12v/). They are also used in the marine industry.
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