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Unread 08-12-2014, 06:50 AM   #1
thewolff
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1986 CJ7 
 
Join Date: Aug 2009
Location: sammamish, WA
Posts: 131
Heater knobs operation

Question,

I worked on my 86 CJ7 heater system last night.

The Air knob;

I pull half way out to "Heat" and I hear something operating but I don't see anything moving. ???

I pull all the way out to "Vent" and the door in the well between the hood and the windshield opens at the same time the door near the passengers feet open. ???

Can someone please explain the operation of this and does the "Temp" knob operate a flow control valve that allows water to flow through the heater core?

Thanks

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Unread 08-12-2014, 07:08 AM   #2
Mike Romain
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1986 CJ7 
 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant, Nova Scotia, Canada
Posts: 13,591
Half way let's outside air into the heater box so you have air flow to the feet or windshield as you move and gives the fan air flow so it can blow properly. This also helps keep a soft top inflated so it doesn't flap so much.
All the way out is the fresh air vent that opens by the passenger side feet and another flap up under for the drivers side feet. This bypasses the heater core area.
The heater control is a bypass flap. Coolant always flows through the core, the heat control just says how much fresh air either goes through the core or bypasses it to just blow outside air in when the air knob is half way.
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86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
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Unread 08-12-2014, 10:33 AM   #3
Renegade82
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1982 CJ7 
 
Join Date: Apr 2011
Location: Lewistown, PA
Posts: 3,710
This may help you.
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My frame off Re-Build: (still in progress....)
http://www.jeepforum.com/forum/f8/30...e-off-1280850/
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Unread 08-12-2014, 02:48 PM   #4
thewolff
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1986 CJ7 
 
Join Date: Aug 2009
Location: sammamish, WA
Posts: 131
Helps a lot. Thanks guys.
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Unread 09-29-2014, 08:13 PM   #5
archer1965
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1972 CJ5 
 
Join Date: Jun 2014
Location: Lake Stevens, Wa
Posts: 1
Anybody have photos of a 72-75 heater box? Having issues with mine and would like to compare.
thanks
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