A/C wiring questions

[chadco]

I am putting in a new A/C system and my fan speed switch was burned out and I lost my temp control switch somewhere in the last 10 years. I have new switches but of course they are different than the old ones.

This is a pic of the old one 10 years ago when I took it apart.
It has L M H on three of the tabs which I am assuming is low,
medium, and hi. The other 2 tabs are labeled B and C.


The new switch has 5 tabs as well and are labeled:
+ , 1, 2, 3, and 4. The + obviously is the 12v source,
but I only have a 3 speed fan.



This is a pic from the previous set up 10 years ago.




The green wire was a jumper from the fan switch
over to the temp control, but I don't know which of the two
tabs it goes to on the new control unit. The other wire from
the temp control is black. The wires I have now are red, yellow,
orange (fan speeds?) then a brown and a black that go through
the fire wall.

New temp control labeled 4 top blade, 3 (c) bottom blade




Wires



Firewall




Thanks in advance for the help.

Chad.

[kuehl]

Schematic, compliments of Pelican.
The color codes are abbreviated.

Look at your wires and trace them back.

B would be to the thermostat
C would be solid red power in to your switch

1) You need a power wire to the new switch.
2) You need a wire from the new switch to the thermostat, such that when the new switch is turned on either of its 3 speed settings, power flow from the switch to the thermostat.
3) Depending upon the type of evap motor that is in the evap blower box,
you need power wires to the evap blower motor. If the evap blower motor is stock (a two wire PM motor) you will have wires from the switch corresponding to wires at the evaporator fan resistor unit, or if you have an aftermarket motor with its own fan speed wires (it would have more than 2 wires) for speed control you'd match those wires to your switch positions.

If you need more help, drop me a PM.

[Synchro Joe]

Knowing your year/model would help as well. PM me and I can send you a scan of 1988 Air Cond wiring in PDF format.

[kuehl]

The AC circuit is basically the same for 1970-1989.

The key to wiring the switch to the evap motor is what kind of motor do you have?

A stock factory evap motor is a 2 wire PM (permanent magnet) motor which requires either the evaporator fan resistor unit or something like a Kuehl Variable Speed Fan Control, Pelican PN GR-KUEHLSPEED-85, to alter motor fan speeds.

There are a few 3 speed fan motors that were sold in the aftermarket which have multiple wires (more than 2) to from the motor armature; this design deletes the need for the evaporator fan resistor unit however these motors don't last as long as PM types.

Looking at the colors of the wires that were attached to your old fan speed switch
may suggest the later type of DC motor, so look at the evaporator box, locate the wires from the evap motor and let us know how many wires you have and what the colors are.

[wwest]

A more cost effective PWM motor controller....

30 AMP ones run more like ~$30.00


12V 24V 30V 120W PWM Adjustable Volt DC Motor Speed Controller CCM2 | eBay

[kuehl]

Originally Posted by wwest

A more cost effective PWM motor controller....

30 AMP ones run more like ~$30.00

Gee Willy, we thought you would be offering some of your Porsche electrical experience to the thread, rather than your PAPD Controller!
That makes about 8 posts promoting your Chinese product.

[wwest]

Originally Posted by kuehl

Gee Willy, we thought you would be offering some of your Porsche electrical experience to the thread, rather than your PAPD Controller!
That makes about 8 posts promoting your Chinese product.

So, can you offer proof that your controller isn't built by an Asian manufacturing firm?

Most electronics manufacturing is....


More than likely, 99-1, the PC you are using is.

"8 posts..." likely a 1:1 match with the number of your posts peddling your made in China (generic) PWM controller.

[kuehl]

Wild Willy, my oh my, your PAPD is on a high level today. But, just because you asked, why yes!

The Kuehl Variable Speed Fan Controller was designed in the USA.
And, it is assembled and tested in the USA!

As far as our "pc", our present "computa" is an IntelliStation Zpro dual Xeon. It's old, but reliable. Much of it was design, assembled and built in the USA, naturally so
of the old dog's parts were made offshore, like you.

And, once again, thank you for making a substantial contribution to solving chadco's electrical issue.
You are starting off the 2015 season as expected. Should be another enjoyable year.

[wwest]

Originally Posted by kuehl

Wild Willy, my oh my, your PAPD is on a high level today. But, just because you asked, why yes!
The Kuehl Variable Speed Fan Controller was designed in the USA.
And, it is assembled and tested in the USA!

And, once again, thank you for making a substantial contribution to solving chadco's electrical issue.
You are starting off the 2015 season as expected. Should be another enjoyable year.

Designed, assembled, tested...


That's the way of most Asian manufactured electronic products, as long as "some assembly required" the import tax is negated.

It is no longer cost effective, hasn't been for many years now, to manufacture electronics assemblies such as this in the US. But then that's maybe why yours is not cost effective in comparison.

[Ronnie's.930]

Originally Posted by kuehl

Gee Willy, we thought you would be offering some of your Porsche electrical experience to the thread, rather than your PAPD Controller!
That makes about 8 posts promoting your Chinese product.

Griff, you know what's truly "Willy style" about his promotional activity - he hasn't even tried one of those in a car of his! Par for the WW course, BUTTofcourse!

[kuehl]

Originally Posted by wwest

It is no longer cost effective, hasn't been for many years now, to manufacture electronics assemblies such as this in the US.

Willy, Willy. You know its attitudes like yours that kills the American economy, sending dollars offshore with no reciprocal returns. You are the apotheosis of the Walmart mindset.

We chose to design and build the controller here in the US for several reasons, however you would never 'get it'.

[wwest]

I haven't....?

Mine is wired through a multi-pole switch.

Switch position #2 the PWM controls the evaporator motor speed.

Position #3 the PWM controls the cabin heater blower speed. Note: The cabin heater blower draws intake airflow ONLY from the engine compartment, the engine blower path is closed, blocked off.

More engine cooling that way, and cabin heater airflow does not vary with RPM.

Position #4 supplies full power to the cabin heat blower and the PWM then controls the footwell blower speed provided the reed relay permits..

#1 all off.

The trinary switch is wired, spliced into, the engine oil "over-temp" input to the cabin heat controller module such that it can activate the cabin heater blower as an aid to rear lid condenser airflow.

Have to remember to close the heat flow valves in that case.

[wwest]

Originally Posted by kuehl

Willy, Willy. You know its attitudes like yours that kills the American economy, sending dollars offshore with no reciprocal returns. You are the apotheosis of the Walmart mindset.

We chose to design and build the controller here in the US for several reasons, however you would never 'get it'.

"No reciprocal returns.."

Would believe me if I said that something like 50% of all LCD panels made offshore (99% are) are "printed" using my company's "stepper" controlling computers? Manufactured SOLELY in the US, not enough volume, ~2000/15 years, to justify offshore.

Our forte', the US, is in concept and design, live with it.

[wwest]

Needs work, dress-up..

[SilberUrS6]

Originally Posted by Ronnie's.930

Griff, you know what's truly "Willy style" about his promotional activity - he hasn't even tried one of those in a car of his! Par for the WW course, BUTTofcourse!

Of course not. He's an "idea" guy, and leaves the alpha and beta testing to his "customers".

[chadco]

Thanks for the schematic Keuhl !
That helps out greatly. I searched the pelican site
for something like that but kept on coming up empty.
My motor is black and has 3 wires coming out of it.
Red, Yellow and Orange which correlate to the wires
in the pics that connect to the fan speed switch.

[kuehl]

Chadco,

Good. Glad to see you dug deeper.
I'll post the wire connections for you after I finish the morning's first coffee and knock the snow off the car.

My empathy's to ya for having your thread hacked with Willy Wonka's passive-aggressive personality disorder, but its the only entertainment we are allowed here.

[KerryM]

wwest and kuehl.....I appreciate and thank both of you for your significant contributions to this site that have helped many of us newcomers.

Now can you move your adolescent games with each other to private messages. Neither one of you is helping your own, or your firm's cause.

Thanks

[GH85Carrera]

Originally Posted by KerryM

wwest and kuehl.....I appreciate and thank both of you for your significant contributions to this site that have helped many of us newcomers.

Now can you move your adolescent games with each other to private messages. Neither one of you is helping your own, or your firm's cause.

Thanks

Kuhel provided a nice wiring diagram and real useful information on the subject of the original question. Willy continues to promote Chinese junk. You can chose who to believe. I would suggest listening to the one AC professional in this thread. If all you have is complaints, take it to the moderators. You are not the thread police.

[rick-l]

I for one did not know that willy west had a financial interest in that trinary switch that had to be inserted everywhere.

This season it will be a bare buck regulator that would be way more trouble to fit than just use what is there.