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Unread 01-02-2008, 09:48 AM   #1
chrisplaner
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Join Date: Jan 2008
Location: Reading, PA
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1982 Wagoneer Limited - heat/defrost issue

Hello - I have a 1982 Jeep Wagoneer Limited that started having an issue with the front defroster and heater. Up until a few weeks ago the defroster blew hard enough that I could feel it my face while driving. Now I have no defroster and the heater doesn't blow any heat from the bottom either. I can hear the motor on the fan turning and if I open the fresh air vent I get lots of warm air, however, I get no heat and no defroster. Is this a common issue? Can someone make a suggestion as to where I could find a schematic of the heater/defrosting system or do you think it might just be a switch issue?
THANKS!
Chris

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Unread 01-03-2008, 01:19 PM   #2
JPJeeper
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Head on over to IFSJA.org and look for a link

They have links to schematic places...

its like... ole jeep something...
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Unread 01-06-2008, 06:21 PM   #3
chrisplaner
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Hello All,

I found the issue. The vacuum line that goes from the fire wall ito the off/heat/defrost mechanism was melted. As soon as I fixed the line the
defroster and heater started working!

Chris
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Unread 01-23-2012, 01:07 PM   #4
Nortchief
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1982 FSJ Cherokee 
 
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Location: Springdale, AR
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I have a "new to me" 1982 Cherokee Chief. I am trying to find the vacuum source on the other side of the firewall (engine compartment) from the heater control switch on the dash. The "off" vacuum line is cut and I need to know where to run it, the "heat" and "defrost" lines are connected correctly...I just have not vacuum.
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Unread 01-28-2012, 06:35 PM   #5
jamesabasile
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Quote:
Originally Posted by Nortchief
I have a "new to me" 1982 Cherokee Chief. I am trying to find the vacuum source on the other side of the firewall (engine compartment) from the heater control switch on the dash. The "off" vacuum line is cut and I need to know where to run it, the "heat" and "defrost" lines are connected correctly...I just have not vacuum.
There should be a vacuum reservoir on the firewall
Jim
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Unread 01-31-2012, 08:21 AM   #6
73pumpkin
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1973 FSJ Wagoneer 
 
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I'm not sure on 82s and 83s, but on 70s models there is a black plastic drum about the size of a big fist that your vacuum line goes to I think. In my 73 it was on the driver's side fender. i actually removed it from there and stuck it on an extra on the carb. I just rebuilt my heating system on my 73.
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Unread 02-01-2012, 05:28 PM   #7
Nortchief
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1982 FSJ Cherokee 
 
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Location: Springdale, AR
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My 82 Cherokee Chief does not have an air canister (the black plastic drum), yours may. I just resolved the issue by connecting my heater control vacuum line. Here's how it went in case anybody is interested. My heater controls are vacuum operated with no electric power by three vacuum lines that connect to the heater controls on the instrument panel; one line provides vacuum from the engine through a line entering the firewall (either through the canister or mine was directly from the manifold which caused the confusion); the second line runs from the heater control in the instrument panel to a control valve under the dash on the passenger side that opens when you press the heater button; the third runs from the same heater control to the control valve under the dash behind the glove box that opens when you press the defrost button.

Keep in mind that your blower motor, heater controls, and a/c (if you have it) are independent units. They just work with one another...if that makes sense.
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