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sportsman_500's avatar
sportsman_500
Explorer
Aug 20, 2017

Onan Generator Heat

On my Raptor 3612 the generator compartment is designed probably like every other one out there. Over the weekend we were running the genny almost non-stop. On Friday night I was checking a few things and noticed the generator compartment door was very hot to the point where you almost could not touch it. When I opened the door I found that the inside liner had deformed from the heat and on the lower right hand corner of the generator there is a horseshoe shaped opening. Super hot air was blasting out of that opening onto the inside of the compartment door. Has anyone else experienced this? Is that hole on the right lower supposed to be blocked off? or is it part of the generator cooling system?





Edited Images to fit the page.
Toy Haulers

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  • allcool's avatar
    allcool
    Explorer
    Aug 21, 2017
    Lincster is right. Check installation manual. It gives specific dimensions/locations of holes that need to be cut in floor where genny mounts for proper air flow. No heat should be blowing out anywhere inside the genny compartment. All cooling air flow, intake air and exhaust air is underneath the genny to the outside of rv.

    Hard to see clearly, but from your pics, looks like genny cover is not on correctly and rubber gasket is not in place. If cover is not on correctly air cooling flow will not work right.
  • lincster's avatar
    lincster
    Explorer
    Aug 21, 2017
    You may want to google the installation manual for your genny.
    It gives instructions and pix of air flow and how a genny should be installed.
    I don't think yours is correct.
  • sportsman_500's avatar
    sportsman_500
    Explorer
    Aug 21, 2017
    lincster wrote:
    Why is the genny sitting on foam?
    I would be concerned about that.
    That foam will hold heat.

    It is not. It looks that way from the pic. The foam is the seal between the generator enclosure built into the compartment and the compartment door.
  • tinner12002's avatar
    tinner12002
    Explorer
    Aug 21, 2017
    lincster wrote:
    Why is the genny sitting on foam?
    I would be concerned about that.
    That foam will hold heat.


    And the foam may be blocking the air circulation for the genny causing excessive heat.
  • lincster's avatar
    lincster
    Explorer
    Aug 21, 2017
    Why is the genny sitting on foam?
    I would be concerned about that.
    That foam will hold heat.
  • hvac's avatar
    hvac
    Explorer
    Aug 20, 2017
    Our ATC 28 front bedroom has same size 5.5 mounted on the tongue. They enclosed it with a metal cover but its not internal to the coach. So far no issues.
  • ford_truck_guy's avatar
    ford_truck_guy
    Nomad
    Aug 20, 2017
    ford truck guy wrote:
    I believe that cut out is for the folks that need to run the exhaust that way. There are 2 of those, 1 on the front and 1 on the back..

    The way it was explained to me is that the generator sucks in ambient air from the center front of the Onan, ot cools, then pushes the hot air out. That air comes out real close to where the cool air is sucked in..once you fill that hole, the hot air mail be pushed somewhere else.

    I took some heat blanket and stuffed it in the holes, then I used foil tape to seal those holes..

    MOST of my heat is now directed in the right direction.. I also purchased a scoop from Onan that helps direct the heated air to the street side of the trailer....

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