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> Heater control lever wire
jesse7flying
post Apr 28 2025, 06:03 PM
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As I go through the somewhat butchered wiring harness on my new to me '73 2.0L, I've run across a green with white stripe wire which has been lengthened with some butt connectors running along the center of the car. It looks like the wire is connected to the heater control lever. Can someone explain what this does? The only green/white wire I find referenced in the Prospero Garage drawing goes from the heater fan switch to pin 9 regulator plate in the engine compartment. Thx for the help.
Jesse
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Ron914
post Apr 28 2025, 07:25 PM
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QUOTE(jesse7flying @ Apr 28 2025, 07:03 PM) *

As I go through the somewhat butchered wiring harness on my new to me '73 2.0L, I've run across a green with white stripe wire which has been lengthened with some butt connectors running along the center of the car. It looks like the wire is connected to the heater control lever. Can someone explain what this does? The only green/white wire I find referenced in the Prospero Garage drawing goes from the heater fan switch to pin 9 regulator plate in the engine compartment. Thx for the help.
Jesse

I believe it goes to the red defrost control lever behind the shifter to turn on the blower fan in the engine compartment drivers side.
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Ron914
post Apr 28 2025, 07:33 PM
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QUOTE(Ron914 @ Apr 28 2025, 08:25 PM) *

QUOTE(jesse7flying @ Apr 28 2025, 07:03 PM) *

As I go through the somewhat butchered wiring harness on my new to me '73 2.0L, I've run across a green with white stripe wire which has been lengthened with some butt connectors running along the center of the car. It looks like the wire is connected to the heater control lever. Can someone explain what this does? The only green/white wire I find referenced in the Prospero Garage drawing goes from the heater fan switch to pin 9 regulator plate in the engine compartment. Thx for the help.
Jesse

I believe it goes to the red defrost control lever behind the shifter to turn on the blower fan in the engine compartment drivers side.This is from my 1976. Actually as I re-read I think I am wrong .

I think this is what its for .
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Ron914
post Apr 28 2025, 07:47 PM
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QUOTE(Ron914 @ Apr 28 2025, 08:33 PM) *

QUOTE(Ron914 @ Apr 28 2025, 08:25 PM) *

QUOTE(jesse7flying @ Apr 28 2025, 07:03 PM) *

As I go through the somewhat butchered wiring harness on my new to me '73 2.0L, I've run across a green with white stripe wire which has been lengthened with some butt connectors running along the center of the car. It looks like the wire is connected to the heater control lever. Can someone explain what this does? The only green/white wire I find referenced in the Prospero Garage drawing goes from the heater fan switch to pin 9 regulator plate in the engine compartment. Thx for the help.
Jesse

I believe it goes to the red defrost control lever behind the shifter to turn on the blower fan in the engine compartment drivers side.This is from my 1976. Actually as I re-read I think I am wrong .

I think this is what its for .
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in my Haynes wiring diagram for a 73 it shows #63 as the fresh air fan in the frunk with a WH/GR wire going to the fan control for the motor coming from #30 the fan switch .
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Ron914
post Apr 28 2025, 08:03 PM
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looking at the diagram (Haynes doesn't make the most easy to read diagrams ) I see pin #9 on the regulator plate(90) going to (37) the heater fan switch which I still think is the control red lever below the shifter (console) that turn on the blower connected to the heat exchangers .
Someone correct me if I'm am wrong please .I still learning about these 914's
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Dave_Darling
post Apr 28 2025, 11:55 PM
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No, you've got it right.

This wire gets grounded when that lever is pulled up all the way. This tells the heater blower relay in the engine bay (on the relay board) to send power to the heater blower fan.

--DD
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Ron914
post Apr 29 2025, 01:23 PM
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QUOTE(Dave_Darling @ Apr 29 2025, 12:55 AM) *

No, you've got it right.

This wire gets grounded when that lever is pulled up all the way. This tells the heater blower relay in the engine bay (on the relay board) to send power to the heater blower fan.

--DD

Thanks ,
I'm trying to be helpful on the site .
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jim_hoyland
post May 16 2025, 08:58 PM
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Where on the Heat-lever does the wire attach ?
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914sgofast2
post May 16 2025, 09:19 PM
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It attaches to a male spade type connection on the bottom of the lever’s switch mounting. The wire should have a female spade connector.
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jim_hoyland
post May 17 2025, 08:39 AM
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Thanks; I’ll have to look deeper (IMG:style_emoticons/default/smile.gif)
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ThinAir
post May 19 2025, 12:36 PM
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When I connected my fan to the connector in the engine bay, it started running regardless of the heater switch position. I ended running a separate wire with a switch that I can turn on when I want, but I've never been comfortable with this arrangement.
It seems that the wire must be grounded somewhere, but I'm wondering if it is just because of the way the heater lever is installed. Is it supposed to have any kind of insulation or a way to prevent the fan being grounded until the lever is all the way up?
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jim_hoyland
post May 19 2025, 04:07 PM
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How / where is the little square Defrost light attached ?
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jim_hoyland
post May 19 2025, 04:08 PM
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How / where is the little square Defrost light attached ?
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jim_hoyland
post May 19 2025, 04:12 PM
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How / where is the little square Defrost light attached ?


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BillC
post May 19 2025, 06:31 PM
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QUOTE(jim_hoyland @ May 19 2025, 06:12 PM) *

How / where is the little square Defrost light attached ?

The defrost light doesn't actually have anything to do with heating or defrosting. It is tied into the running lights, and is to help you find the lever in the dark. There should be a wire with a small (1/8"-ish) female electrical connector in the vicinity of the handle. On my car (a '73), the wire is black with a blue spiral.
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jim_hoyland
post May 19 2025, 08:12 PM
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(IMG:style_emoticons/default/smile.gif) I see it, thanks…
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