Dash heat help please 2016 Sunova 33C

chickenman05 · 07-09-2023, 07:43 AM

2016 Sunova 33c - Can anyone with similar coach trace the heater hose lines that are marked with blue tape in photo and take a picture? I'm trying to see if my hoses are hooked up wrong - thanks.

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thompwil · 07-09-2023, 08:32 AM

This is how ours is plumbed, I suspect yours may be the same. You can find yours in the Winnebago parts web site listed under your year and model. The part can be found in the section called "Auto A/C & Heat Chassis”.
I had two things go wrong with ours, one of the hoses was cut too short and was kinked shut not allowing heat to the dash. The other was the valve leaking from the stem and required replacement.

chickenman05 · 07-09-2023, 09:03 AM

Quote:

Originally Posted by thompwil

This is how ours is plumbed, I suspect yours may be the same. You can find yours in the Winnebago parts web site listed under your year and model. The part can be found in the section called "Auto A/C & Heat Chassis”.
I had two things go wrong with ours, one of the hoses was cut too short and was kinked shut not allowing heat to the dash. The other was the valve leaking from the stem and required replacement.

Thanks - well that looks like mine is correct. Was the valve leaking visable from outside or internal? Also, where was your kink? Thamks!

thompwil · 07-09-2023, 09:38 AM

The leak was visible, coming out from the stem as circled on the pic.
The hose that was kinked shut was the one connected to the back of the valve and does the "J" curve to the left going to the heater core (on the graphic pic). It was installed way too short for the 180 degree sweep it had to make. I had to replace it with one about a foot and a half longer for it not to kink. Little to no heat before, lots of heat when needed now.

chickenman05 · 07-09-2023, 06:19 PM

thank you - you east coasters are the best - this will help me sooo much! Safe travels!

chickenman05 · 08-31-2023, 07:35 PM

So everything was hooked up correct with no kinked hoses and heater valve worked fine - just no warm air. Back flushed heater core but it was fine. Disconnected and tried to flush the line going to the motoraid and aux rear heater and no flow then suddenly a burst of water and it flows freely both directions. Could not find whatever it was as I was working in gravel driveway but hooked everything back up and it works great!

Ray,IN · 09-01-2023, 09:06 AM

That makes me suspect you need to drain and flush your cooling system too. Whatever was plugging the heater hose had to be created in the cooling system.