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Author Topic: Heater controls and What is this plug for?  (Read 492 times)

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Offline trucker79005

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Heater controls and What is this plug for?
« on: July 20, 2017, 01:03:51 PM »
Well, I pulled out the radio and heater controls to figure out why my heater blew hot air when on cold. I found the cable unhooked that went to the door and it looks like the plastic valve on the heater controls that the vacuum hoses hook has a nipple broke off. I've checked American parts depot and Kennedy American and didn't see the part but I'm not sure what its proper name would be. Anybody know if a replacement is possible??

Also found these wires that weren't hooked to anything and was just curious if anyone knew what they were for. I'm not really sure what diagram you would look at since its not hooked to anything. I think everything is hooked up to my radio. There is the Red and Blue wires that go into this T type connector and then the orange wire that has what I might call a bullet type connector.

Also, does anyone know what screws to use for the dash. I seem to be missing a few.
« Last Edit: July 20, 2017, 01:45:02 PM by trucker79005 »
Laura (Shorty)
1978 AMC Concord 2DR Hatchback w/ Ralley package
1983 AMC Eagle Wagon Limited w/ 5 speed
1971 Ford F250:)

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Re: Heater controls and What is this plug for?
« Reply #1 on: July 20, 2017, 08:00:27 PM »
The vacuum control is a 3693112 "Switch, Vacuum" (or J3693112 in MOPAR language).    They are not available new; but the same switch was used on all 1978 thru 1988 AMC passenger cars, except Pacer.   Hopefully you can find a good used one.

I'll pipe up later if I find out anything on my wiring diagrams about your wires (look "radio-ish" to me).
George G.
'81 Eagle Sundancer
'85 Eagle Waggie
1960 1902 Rambler Replica
'64 American
'70 AMX (Big Bad Blue), '70 AMX (White)
'77 Gremlin
'78 Pacer Coupe, '78 Pacer Wagon
'79 Pacer Wagon
'73 Jensen Interceptor
'86 Audi 5000 Turbo
'98 Aston Martin DB7
'09 Nissan Titan
'10 Nissan Maxima

Offline mo.eagles

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Re: Heater controls and What is this plug for?
« Reply #2 on: July 20, 2017, 08:06:06 PM »
All orange wires go to lights . Dash lights ,glove box light , courtesy lights, radio light, etc... If it is tan with a stripe it goes to a power amp . The red and blue is the ETR connection . The vacuum switch controls the water valve under the hood . It may be stuck in the heat position so you will get hot air all the time.
« Last Edit: July 20, 2017, 08:27:58 PM by mo.eagles »
'85 wagon Limited   tilt wheel , cruise control
power seats ,windows and locks
rear window washer /wiper 
tach and gauge package
A/C
 '85 wagon   power windows and locks
rear window washer/wiper
factory tow package
A/C
 '84 wagon parts

Offline trucker79005

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Re: Heater controls and What is this plug for?
« Reply #3 on: July 21, 2017, 10:45:32 AM »
The vacuum control is a 3693112 "Switch, Vacuum" (or J3693112 in MOPAR language).    They are not available new; but the same switch was used on all 1978 thru 1988 AMC passenger cars, except Pacer.   Hopefully you can find a good used one.

Thanks so much for that. I had a feeling i wouldn't find them new. Thinking i can just run vacuum straight to the control under the hood for summer until i can find one. I hope.

All orange wires go to lights . Dash lights ,glove box light , courtesy lights, radio light, etc... If it is tan with a stripe it goes to a power amp . The red and blue is the ETR connection . The vacuum switch controls the water valve under the hood . It may be stuck in the heat position so you will get hot air all the time.
Awesome information! Saving this for future reference. Unfortunately you lost me on "ETR". Maybe if I thought about it long enough it would come to me... or not. I am wondering if the valve under the hood is stuck also but i know for sure that the vacuum lines were not hooked up to the back of the Switch and it is broke.
Laura (Shorty)
1978 AMC Concord 2DR Hatchback w/ Ralley package
1983 AMC Eagle Wagon Limited w/ 5 speed
1971 Ford F250:)

Offline amarshall

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Re: Heater controls and What is this plug for?
« Reply #4 on: July 21, 2017, 11:48:31 AM »
If the heater bypass valve under the hood is frozen, a cheaper replacement can be used from a Jeep Cherokee.  They look different and are plastic, but they are only about $15 and have the same function.  The plastic version is 5/8" on all connections and the original Eagle one is 3/4" on a couple legs so original hoses may be loose.  I wrapped mine with some rubber stretchy tape and the 3/4" hose sealed fine.

My original:


and the Cherokee version:
Wanted:  Rear axle hub
Any leads on 3.07 ratio front differential


1988 Eagle Wagon - Overlander Build
http://forums.amceaglesden.com/index.php?topic=45852.0

Offline mo.eagles

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Re: Heater controls and What is this plug for?
« Reply #5 on: July 21, 2017, 06:38:22 PM »
ETR is energy transfer relay . For the Flux capacitor.  :rotfl:  I have no idea what it is . I found it in the diagrams when I had wiring issues awhile back and I've been trying to figure it out.
'85 wagon Limited   tilt wheel , cruise control
power seats ,windows and locks
rear window washer /wiper 
tach and gauge package
A/C
 '85 wagon   power windows and locks
rear window washer/wiper
factory tow package
A/C
 '84 wagon parts

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Re: Heater controls and What is this plug for?
« Reply #6 on: July 21, 2017, 07:12:29 PM »
ETR is the "fancy" radio - Electronically Tuned Radio.
George G.
'81 Eagle Sundancer
'85 Eagle Waggie
1960 1902 Rambler Replica
'64 American
'70 AMX (Big Bad Blue), '70 AMX (White)
'77 Gremlin
'78 Pacer Coupe, '78 Pacer Wagon
'79 Pacer Wagon
'73 Jensen Interceptor
'86 Audi 5000 Turbo
'98 Aston Martin DB7
'09 Nissan Titan
'10 Nissan Maxima

Offline mo.eagles

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Re: Heater controls and What is this plug for?
« Reply #7 on: July 21, 2017, 08:27:11 PM »
ETR is the "fancy" radio - Electronically Tuned Radio.
I thought that's what it was but I did not want to guess .
'85 wagon Limited   tilt wheel , cruise control
power seats ,windows and locks
rear window washer /wiper 
tach and gauge package
A/C
 '85 wagon   power windows and locks
rear window washer/wiper
factory tow package
A/C
 '84 wagon parts

Offline trucker79005

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Re: Heater controls and What is this plug for?
« Reply #8 on: July 22, 2017, 01:18:28 AM »
ETR is energy transfer relay . For the Flux capacitor.  :rotfl:  I have no idea what it is . I found it in the diagrams when I had wiring issues awhile back and I've been trying to figure it out.
;D funny

ETR is the "fancy" radio - Electronically Tuned Radio.
thanks:) Guess I don't really need that
Laura (Shorty)
1978 AMC Concord 2DR Hatchback w/ Ralley package
1983 AMC Eagle Wagon Limited w/ 5 speed
1971 Ford F250:)

Offline vangremlin

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Re: Heater controls and What is this plug for?
« Reply #9 on: July 22, 2017, 10:22:42 AM »
...... a cheaper replacement can be used from a Jeep Cherokee.  They look different and are plastic, but they are only about $15 and have the same function. 

Which year Cherokee does that come off of?  Thanks.
1981 Kammback 258 - "Pepe"
1980 Coupe 258 - "Ginger
1972 Gremlin X 304
1978 Gremlin 4 cyl 121 - sold
1964 TBird 390 - sold

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Re: Heater controls and What is this plug for?
« Reply #10 on: July 22, 2017, 12:47:53 PM »
Or you can get the "1980-only" version cheap on RockAuto right now (~$20).    Has trhe same form/fit/function; but you have to add a pipe plug to the sensor hole.
George G.
'81 Eagle Sundancer
'85 Eagle Waggie
1960 1902 Rambler Replica
'64 American
'70 AMX (Big Bad Blue), '70 AMX (White)
'77 Gremlin
'78 Pacer Coupe, '78 Pacer Wagon
'79 Pacer Wagon
'73 Jensen Interceptor
'86 Audi 5000 Turbo
'98 Aston Martin DB7
'09 Nissan Titan
'10 Nissan Maxima

Offline amarshall

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Re: Heater controls and What is this plug for?
« Reply #11 on: July 23, 2017, 09:46:19 PM »
The heater control valve I used was from Rock Auto also, it is a "Four Seasons 74777".  I found it by looking under a 1994 Jeep Cherokee, but it might also be found in other years.
Wanted:  Rear axle hub
Any leads on 3.07 ratio front differential


1988 Eagle Wagon - Overlander Build
http://forums.amceaglesden.com/index.php?topic=45852.0

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Re: Heater controls and What is this plug for?
« Reply #12 on: July 23, 2017, 11:42:11 PM »
Good to know on the Jeep part.   I just checked RockAuto again for the 1980 versions; and they're all gone!!    I got 2 of them -- the Four Seasons number was 74704 if anyone finds them elsewhere.   I hope Den members got the others!
George G.
'81 Eagle Sundancer
'85 Eagle Waggie
1960 1902 Rambler Replica
'64 American
'70 AMX (Big Bad Blue), '70 AMX (White)
'77 Gremlin
'78 Pacer Coupe, '78 Pacer Wagon
'79 Pacer Wagon
'73 Jensen Interceptor
'86 Audi 5000 Turbo
'98 Aston Martin DB7
'09 Nissan Titan
'10 Nissan Maxima

Online mudkicker715

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Re: Heater controls and What is this plug for?
« Reply #13 on: July 25, 2017, 06:44:51 PM »
I just saw that i have a nos one while packing up last night. No i am not giving it up. Just glad i have a replacement.



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Offline sandmtnjeep

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Re: Heater controls and What is this plug for?
« Reply #14 on: September 27, 2017, 09:35:31 PM »
American Part Depot had them a short while back for $25.  They required a plug.

 

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