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M380 (Unique Issues) If you have a unique issue with your M380 model coach and it can't be answered in one of the other forums here, then this is where you can list it.....list your M380 Parts here too.

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  #11  
Old 12-11-2019
DW SD DW SD is offline
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Could you see the kinked hoses through the grills? Or only once disassembling the closet? Or was the only symptom weak heat?

I've run some fuel hose with tight bends. When I didn't want to install a 90 bend, I've dropped a fairly heavy stainless steel spring inside similar to the ID to ensure they don't kink. I've bought bulk spring at mcmaster for that purpose.

Doug
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  #12  
Old 12-11-2019
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chiplamb chiplamb is offline
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Could only see when disassembled.
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2004 M380 99k/22xx hours
1987 FC35 TMU/42xx hours
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  #13  
Old 12-11-2019
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When I made a field repair of the short 90-degree hose inside the Hurricane (later replaced with a pre-formed 90), I took the spring off a short garden hose extender and put it on the outside. Did a decent job and corrosion wasn't a concern.


When I got that M380 the back loop was completely non-functional. Chuck thought it was an air lock, but flushing it (which I could only do after installing the second ball valve) showed a green/pink sludge of vaseline consistency. Blamed it all on someone using green antifreeze while other owners used proper pink boiler fluid, but it may well have been exacerbated by those kinks slowing things down.


Presumably if you can run both loops wide-open they will do a better job of heating. I interpreted the need to partially close the front loop as being because of the greater length in the rear, but that may prove to not be the case. It will be interesting to see how things go for Chip.
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  #14  
Old 12-11-2019
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Well, it was no doubt due to both the sludge and the kinked hoses. If anyone else has a light duty back loop, they should look in here. I'll document the retrofit of a single 8kBTU heater with plenum and ducts which will clean up the loop back here quite a bit. As I cannot determine which is the feed and which is the return, it will either heat the bedroom first and then the bath or vice versa.

I also recall back when people would mix Dex-Cool and antifreeze back when that was all the rage (!!) that the silicates did not get along well and that it would eat copper radiators. The tubes on the SS exchangers are copper and have a weird green fuzz on them so that may have been the case when green and pink were mixed.

Hope to have parts and have this done this weekend. The new front AC/HP arrived today and I swapped the boards out so it's ready to go on the bus as soon as I can get it back in the shop.
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