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TOPIC: C182P - Cabin heat on all the time

C182P - Cabin heat on all the time 3 months 2 weeks ago #917

  • STEVE ELLS
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Sorry for the delay, Yes, you can get to it and check for flapper valve operation. You can also check the actuating cable to see if it's binding.
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C182P - Cabin heat on all the time 3 months 3 weeks ago #916

  • Mark Brenberger
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Is this something that could be inspected with the top half of the cowl off? Would it require an A&P/AI to remediate? THANKS STEVE!
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C182P - Cabin heat on all the time 4 months 3 days ago #915

  • Mark Brenberger
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Thank you very much for your insight, Steve. Always appreciate your responses.
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C182P - Cabin heat on all the time 4 months 3 days ago #913

  • STEVE ELLS
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I know at this point is may seem hard to believe, when the heat control knob is all the way forward, there shouldn't be any heat entering the cabin through the cabin heat system. However, heat may enter the cabin through leaks in the firewall.
The first item to check is whether movement of the control knob does actually move the diverter/flapper valve in the heat box on the firewall. It's possible that although you're moving the control knob, the control wire may be bound up, or bent or the flapper is valve is broken or malfunctioning.
The diverter/flapper valve is located on the copilot's side of the firewall; a orange flex tube (SCAT tube) connects the valve to what looks like the muffler.
The heated air enters an oblong aluminum plenum "box" that ls attached to the aft side of the firewall and extends all the way across the cabin from side to side.
The POH recommends opening the cabin air control to mix the "relatively" cold inlet air with the hot heater air in the plenum to better control the temperature of the heated air entering the cabin .
I always lube the shaft on the diverter/flapper valve during maintenance; sometimes when it's sticking that's all it takes to return it to normal smooth operation.
If you find the cabin heat diverter/flapper valve to work correctly, then you have two options. Open the cabin air to bring more air into the system, Or determine if there's a leak in the firewall. A visual inspection is required to find any firewall leaks.
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C182P - Cabin heat on all the time 4 months 3 days ago #912

  • Mark Brenberger
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Even with the push/pull control pushed all the way in, getting blasted by heat from the cabin heater. Anyone ever experienced this and can anyone make any suggestions to fix? Thank you!
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