A/C heater fan switch diagram

[taroz]

Hello all,

Hope everyone is keeping safe.

Was wondering if anyone knew where I could find a diagram of the internals of the A/C heater fan switch, it's different to the normal blower for non A/C cars. I believe the part number is Stanpart 151243, Lucas 38257.

I've taken mine apart to clean and see if I can get working again but not sure where the internal components sit inside it.

As always any help is much appreciated.

Many thanks,
Tariq

[taroz]

In an (almost) comical follow up to my previous post, does anyone know where I might be able to source one of these internal switch components?

The one on the left is what it should look like, the one on the right is the one just damaged on reassembly... it was so close to going right...

Am hoping these might be standard parts on other cars and that somewhere there might be a supplier that could have them.

Many thanks for any information able to be offered.

Tariq

CDCBD159-0E9A-4CE2-95E7-3C96E1495A48_1_201_a.jpeg

[sujitroy]

Tariq,

I don't have a photo but got this from somewhere. They modified a regular switch.

Stag AC Switch mode

Bench testing it I have:
In the OFF position - no continuity between any poles
In the LOW position - Continuity between poles 1 & 4, and 6 & 7 and
In the HIGH position - Continuity between poles 1 & 4, and 7 & 8


Yea success!! Very grateful to my friend Jerry Benedict who figured out how to modify the switch!!
If you have a standard switch you need to take it apart and either remove the full length continuous copper strip and cut it into two, or if you have a small Dremmel tool you may be able to grind it out in situ in the switch back.
Once you have done that, squeeze BOTH sides of both copper strips together. This will make reinserting the toggles much easier.
Move the switch into the first position (LOW SPEED) and insert two 5/16 hex/Allen keys into the back of the switch back and push them through so the show out the front of the box. Use these to separate the toggles, then keeping the switch steady insert it into the back box gently keeping everything aligned.
Remove the hex/Allen keys and us a small screwdriver to prize the terminals apart.

[trunt]

Tariq,

I don't have a photo but got this from somewhere. They modified a regular switch.

Stag AC Switch mode

Bench testing it I have:
In the OFF position - no continuity between any poles
In the LOW position - Continuity between poles 1 & 4, and 6 & 7 and
In the HIGH position - Continuity between poles 1 & 4, and 7 & 8


Yea success!! Very grateful to my friend Jerry Benedict who figured out how to modify the switch!!
If you have a standard switch you need to take it apart and either remove the full length continuous copper strip and cut it into two, or if you have a small Dremmel tool you may be able to grind it out in situ in the switch back.
Once you have done that, squeeze BOTH sides of both copper strips together. This will make reinserting the toggles much easier.
Move the switch into the first position (LOW SPEED) and insert two 5/16 hex/Allen keys into the back of the switch back and push them through so the show out the front of the box. Use these to separate the toggles, then keeping the switch steady insert it into the back box gently keeping everything aligned.
Remove the hex/Allen keys and us a small screwdriver to prize the terminals apart.

That is incorrect for an A/C Sujit, those continuity checks are bogus.

The correct sequence for my NOS out of the box, proven to work A/C fan switch is..

OFF =1-2 shorted
LOW =2-6 shorted
HIGH =7-8 shorted

But on some switches there is apparently a pin 4 instead of a pin 2 so..

OFF =1-4 shorted
LOW =4-6 shorted
HIGH =7-8 shorted

[malc4d]

Taroz, if you are in the USA you could try calling Michael Coffey Stag parts USA 570 586 1810 to see if he has 1

Triumph Stag Club USA

Michael M. Coffey

401 Brighton Drive

C1810

[taroz]

Tariq,

I don't have a photo but got this from somewhere. They modified a regular switch.

Stag AC Switch mode

Bench testing it I have:
In the OFF position - no continuity between any poles
In the LOW position - Continuity between poles 1 & 4, and 6 & 7 and
In the HIGH position - Continuity between poles 1 & 4, and 7 & 8


Yea success!! Very grateful to my friend Jerry Benedict who figured out how to modify the switch!!
If you have a standard switch you need to take it apart and either remove the full length continuous copper strip and cut it into two, or if you have a small Dremmel tool you may be able to grind it out in situ in the switch back.
Once you have done that, squeeze BOTH sides of both copper strips together. This will make reinserting the toggles much easier.
Move the switch into the first position (LOW SPEED) and insert two 5/16 hex/Allen keys into the back of the switch back and push them through so the show out the front of the box. Use these to separate the toggles, then keeping the switch steady insert it into the back box gently keeping everything aligned.
Remove the hex/Allen keys and us a small screwdriver to prize the terminals apart.

Hi Sujit,

Thanks for the info, I think I'd seen it before somewhere but not sure about going down the modified route just yet.

Tariq

[taroz]

That is incorrect for an A/C Sujit, those continuity checks are bogus.

The correct sequence for my NOS out of the box, proven to work A/C fan switch is..

OFF =1-2 shorted
LOW =2-6 shorted
HIGH =7-8 shorted

But on some switches there is apparently a pin 4 instead of a pin 2 so..

OFF =1-4 shorted
LOW =4-6 shorted
HIGH =7-8 shorted

Hi Terry,

Thanks for the sequence on the original switch, on my one pin 2 and 4 are connected so I suspect works as yours. Now I just need to find an internal part to replace the one I just broke!

Tariq

[trunt]

I would guess that the non a/c switch would have the same internals. It’s quite common and is used on multiple cars.. e.g the light switch on my MGB. Maybe get hold of a used one and use that for parts?

Terry

[taroz]

Taroz, if you are in the USA you could try calling Michael Coffey Stag parts USA 570 586 1810 to see if he has 1

Triumph Stag Club USA

Michael M. Coffey

401 Brighton Drive

C1810

Hi Malc,

Thanks for those details, I'm in the UK but may well be contacting Michael to see if he has the part and if he'll ship it back home to the UK!

Tariq

[taroz]

I would guess that the non a/c switch would have the same internals. It’s quite common and is used on multiple cars.. e.g the light switch on my MGB. Maybe get hold of a used one and use that for parts?

Terry

This is precisely the plan now... I'm checking on second hand ones but there also seem to be plenty of new ones which might have more robust internals. I think the non A/C ones only have one of the internal parts I'm looking for instead of two so I'll have to be careful otherwise this could get expensive for just one switch!

Thanks,
Tariq