A vent thingy inside my vent thingy - Defender Source
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  #1  
Old May 13th, 2016, 10:17 PM
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Brent McDonald
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A vent thingy inside my vent thingy

As my title suggests I don't know what to call this. Tonight I was replacing my front wing top vents on my defender with the KBX forced air intake vents and noticed on my passenger side there was a plenum door inside the vent with a cable running to it. What is that door for and where does the cable go? Is this the door for the defrost? When I select windshield defrost nothing really changes (I have an older pneumatic system in my 88 110 with factory AC). I assumed the vacuum leak somewhere. My dash top vents currently push hot air into my cabin regardless of lever position. Could this be related?
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  #2  
Old May 14th, 2016, 07:09 AM
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Brian
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Pictures?
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  #3  
Old May 14th, 2016, 09:29 AM
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Brent McDonald
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Unfortunately I didn't take any as I was in a hurry to get it installed. I am wondering if this little door is letting hot air from the engine compartment into my cabin. Man, if that is the case and I can close it off that would be great.
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  #4  
Old May 14th, 2016, 09:38 AM
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Quote:
Originally Posted by Brentflyfish View Post
Unfortunately I didn't take any as I was in a hurry to get it installed. I am wondering if this little door is letting hot air from the engine compartment into my cabin. Man, if that is the case and I can close it off that would be great.
I think you're conflating different issues into one.

Whatever is letting hot air from the engine compartment into your cabin isn't those flaps.

Do you have all your bulkhead grommets in place?

Also keep in mind that if you have a ROW style fuel tank, hot air comes up into the cabin through the under-seat access hatch and is radiated through the floor.
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  #5  
Old May 14th, 2016, 10:21 AM
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Brent McDonald
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I have fixed most if not all the grommets and have identified the under seat issue as well. It still gets warm through the bulkhead but is manageable. The dash top defroster vents are always pumping air in while the truck is moving so I suspect a plenum door somewhere.

Back to the original question though, what is the plenum door to that is in the wing too vent box?
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  #6  
Old May 15th, 2016, 03:55 PM
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Ok. Here are pictures. What airflow does the door inside control?
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  #7  
Old May 15th, 2016, 03:56 PM
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Brent McDonald
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Quote:
Originally Posted by Brentflyfish View Post
Ok. Here are pictures. What airflow does the door inside control?
Pic of the door
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  #8  
Old May 16th, 2016, 01:53 PM
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Stephan Laputka
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I believe that's the intake for the heater.
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  #9  
Old May 16th, 2016, 02:07 PM
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John B.
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Looks like a little previous owner custom fab work.
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  #10  
Old May 16th, 2016, 02:39 PM
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Brent McDonald
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So in theory if the door is shut will the heater be pulling in hotter air or could it restrict intake? I am trying to figure out optimal position of the door for summer and winter conditions.
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Old May 16th, 2016, 02:48 PM
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Dan Prasada-Rao
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I'd slap some tape across it and go for a drive.
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  #12  
Old May 16th, 2016, 03:02 PM
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Parrie Willette
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Correct me if I'm wrong but isn't this the air intake for the engine? On my '89 Ninety the air intake located on the side of the wing is for air being supplied to the cabin...the air intake on top of the wing is for the engine. Mine is RH drive so I'm assuming everything would be mirror image (both of my intakes are located on the left hand side of the truck...the right hand side just has blank plates).
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  #13  
Old May 16th, 2016, 03:49 PM
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This duct is the intake for all the air that goes to the heater. Normally, there is a flap at the exit of the heater that shuts off the flow.
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  #14  
Old May 16th, 2016, 03:50 PM
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Brent McDonald
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I don't have any intakes on the sides, only on wing tops. My truck is 1988 LHD and originally a Saudi market with AC. the driver side vent just goes into the engine compartment, no specific intake. the passenger side goes into the large black box I have assumed was for the heater. It does appear to have a small radiator in it like a heater core.
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  #15  
Old May 16th, 2016, 03:57 PM
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John B.
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Yah, looking at the parts diagrams, the early A/C trucks has a flap in there. It shows it vacuum controlled though.
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  #16  
Old May 16th, 2016, 03:59 PM
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Brent McDonald
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Quote:
Originally Posted by Red90 View Post
This duct is the intake for all the air that goes to the heater. Normally, there is a flap at the exit of the heater that shuts off the flow.
that makes sense to me. Question for you - what impact would it have if I shut the door or leave it wide open? the wing top vent I had of that side of the truck actually was sealed - no air would get through so I am not really sure what impact to expect now that I have the forced air vents installed. I am looking for any and all ways to cool down the inside of the truck.
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  #17  
Old May 16th, 2016, 04:03 PM
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Sorry Brent,

I have no idea what I'm looking at. It looks unlike anything I've ever seen.

By the way, can you take a picture of what it looks like from the engine bay? Also can you post a picture of your heater/evap box as well?
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  #18  
Old May 16th, 2016, 04:05 PM
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Parrie Willette
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If you only have the top intakes than I suspect John would be correct. If both the vent flap (the one you can see) and heater outlet flap are both open this would allow heat into the cabin while going down the road as you describe. Sounds like possible broken/disconnected cables not allowing the doors to work properly.
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  #19  
Old May 16th, 2016, 04:05 PM
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I have no idea how the early style A/C system is setup. You probably need to look it over and figure it out yourself. It almost looks like the flap is for a recirculation duct.
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  #20  
Old May 16th, 2016, 04:34 PM
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Ryan Phelps
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I suspect that is the flap that controls recirc. Changing that will not solve your issue. Sounds like the vacuum system has failed and it is defaulting to heat and defrost (typical failure state amongst other vehicle manufactures). Start with solving the vacuum issue and see what that does for you. Probably a disconnected or rotten hose somewhere.
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