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1972 MGB Heater Switch

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1972 MGB Heater Switch
#1
southwest B Lincoln Carter
Albuquerque, NM, USA   USA
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1972 MG MGB
I'm assuming there's a cable of some sort that hooks up to this switch. Where might I find this cable? Where would the other end be located? If not there, is this cable available?


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Re: 1972 MGB Heater Switch
#2
33EJB Avatar
33EJB Tim C
LS, Eastern Ontario, Canada   CAN
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1969 MG MGB
See diagram - - #28

http://www.mossmotors.com/Shop/ViewProducts.aspx?PlateIndexID=29084


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Re: 1972 MGB Heater Switch
#3
Steve Lyle Avatar
Steve Lyle Gold Member
Tulsa, OK, USA   USA
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1972 Lotus Elan
1972 MG MGB
That looks like the left-most cable control - the heat control. It's cable runs to the heater valve bolted to the passenger side of the head. Cable extended is "off(ish)", cable retracted is "heat" (such as it is).

The one on the right controls the direction of the heat - off(ish), footwells (mostly), or defrost vents.


Documenting my project in my journal at https://www.mgexp.com/home#journal

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Re: 1972 MGB Heater Switch
#4
southwest B Lincoln Carter
Albuquerque, NM, USA   USA
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1972 MG MGB
Thank you Steve. Now I need to locate a cable. None visible near switch or valve / head. Found the part in Moss.
Amazing how some folks will hack up these classic cars. I'm also trying to wire up the head light switch (new)
And the Brake light switch (new). Not good with schematics. Just old fashion digging around. What exactly does the Brake light switch do.
I'm thinking it's for the hand brake. The last picture is just a little detail work. That piece was a bear to get off and put back.
Later


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Re: 1972 MGB Heater Switch
#5
AlanR Alan R
Seattle, WA, USA   USA
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1972 MG MGB
Note that in your photos, the cable control is missing the hardware required to fasten the cable. I believe the same to be true of your heater valve. You will need to track these pieces down along with the new cable.

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Re: 1972 MGB Heater Switch
#6
southwest B Lincoln Carter
Albuquerque, NM, USA   USA
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1972 MG MGB
Thank you Alan, Good point. I did find the cable on Moss. I'll be sure to look up the Hardware before I order.


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Re: 1972 MGB Heater Switch
#7
Jim Gevay Avatar
Jim Gevay Silver Member
Circle Pines, MN, USA   USA
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1974 MG MGB
In your second to last photo you show the back side of the dash. On the top of that photo is the brake pressure warning light, what it does is alert you that there's a pressure difference between the two separate systems, which you could feel with your foot too. It has a red light on the front with a 'press to test' button, all it does is test the light bulb function.


Early 1974 MGB with OD, SU HIF's, 72 spoke chrome WW's, Schlemmer distributor, DuBois fuel pump, Limey's relays, Gerry's column kit.

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Re: 1972 MGB Heater Switch
#8
Jeffs72MGB Avatar
Jeffs72MGB Jeff Strong
Eden, NY, USA   USA
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1959 MG MGA 1500
1972 MG MGB
Here is some pics that night help. Jeff


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Re: 1972 MGB Heater Switch
#9
riley1489 Avatar
riley1489 Gold Member Bruce H
Great White North, QC, Canada   CAN
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1953 Jaguar XK120
1959 Riley 1.5 "King George"
1973 MG MGB
The terminals on the switches have numbers that will aid you using the schematic. Not so daunting.

B


Life's most persistent and urgent question is, "What are you doing for others?"

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Re: 1972 MGB Heater Switch
#10
Steve Lyle Avatar
Steve Lyle Gold Member
Tulsa, OK, USA   USA
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1972 Lotus Elan
1972 MG MGB
On the control mechanism, you'll need to fabricate, or get off another mechanism - the outer cable clamp. The back side of it is shown in Jeff's last pic - the tab fitting through and the bolt fixing it to the mechanism. No doubt that cannot be bought separately from the control. The other part you'll need is the cable "barrel clamp" that fixes the inner cable to the mechanism movement arm. That can be bought separately, or you can get them at bicycle or motorcycle shops.


Documenting my project in my journal at https://www.mgexp.com/home#journal

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Re: 1972 MGB Heater Switch
#11
Ex-Calif Avatar
Ex-Calif Gold Member Dan D
Dayton, OH, USA   USA
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1968 MG MGB GT "Bart - Yellow And Naughty"
1977 MG MGB "Red Betty"
2006 Suzuki Grand Vitara "Suzi Q"
2012 Jeep Liberty "Tommy The Tank"
If you are missing bits and they are unobtanium from the usual suppliers I have had about an 80% success rate on the Buy & Sell forum in terms of as advertised quality. Usually the stuff I buy is cheap and all I do is log the person in my book of people I'm gonna kill when I get terminal cancer...

I troll the Buy & Sell every day or so for interesting impuls buys...


The goal - Reliable summer driver interspersed with mechanical tinkering...
Motto - "Driving fifty in the twisties..."
On Mods - It's your damn car - Do what you want. Haters gonna hate...
On SUVs - Drive your B like a soccer mom is texting her friends about how she wants to kill you...
Red Betty - http://www.mgexp.com/registry/GHN5UH418165
Bart - http://www.mgexp.com/registry/GHD4U146898G

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Re: 1972 MGB Heater Switch
#12
Steve Lyle Avatar
Steve Lyle Gold Member
Tulsa, OK, USA   USA
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1972 Lotus Elan
1972 MG MGB
Btw - re: the brake light. All dual-circuit systems were required by US law to have a light to indicate failure of one of the circuits - that's what that light is for. The reason for the test switch for the bulb is that the law also requires that the operator have some way to verify that the warning bulb was still operable. Most other cars, to this day, test the light when you start the car - flashing it in the start sequence. MG apparently didn't want to add the electronics to do that, hence the "push to test" switch.


Documenting my project in my journal at https://www.mgexp.com/home#journal

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Re: 1972 MGB Heater Switch
#13
Ex-Calif Avatar
Ex-Calif Gold Member Dan D
Dayton, OH, USA   USA
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1968 MG MGB GT "Bart - Yellow And Naughty"
1977 MG MGB "Red Betty"
2006 Suzuki Grand Vitara "Suzi Q"
2012 Jeep Liberty "Tommy The Tank"
Until they put a diode in that when failed runs the starter continuously...


The goal - Reliable summer driver interspersed with mechanical tinkering...
Motto - "Driving fifty in the twisties..."
On Mods - It's your damn car - Do what you want. Haters gonna hate...
On SUVs - Drive your B like a soccer mom is texting her friends about how she wants to kill you...
Red Betty - http://www.mgexp.com/registry/GHN5UH418165
Bart - http://www.mgexp.com/registry/GHD4U146898G

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Re: 1972 MGB Heater Switch
#14
riley1489 Avatar
riley1489 Gold Member Bruce H
Great White North, QC, Canada   CAN
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1953 Jaguar XK120
1959 Riley 1.5 "King George"
1973 MG MGB
In reply to # 3049418 by southwest B And the Brake light switch (new). Not good with schematics. What exactly does the Brake light switch do.
I'm thinking it's for the hand brake.

No hand brake light switch or connection for on 1972 model, this is only a test light for brake system. Look in your engine bay on driver side flitch panel. You will find a brake union block,

the plastic switch you see in the photo, (white 'nadger') is the 'business end' of this brake warning light.

Have a look at the schematic, it will be apparent what goes where. smiling smiley

B


Life's most persistent and urgent question is, "What are you doing for others?"

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