Source For NOS Switch?

[GregL]

Hi Guys,
I need to replace the HVAC switch for my C60 air conditioning system.
Anyone know a source for this switch that doesn't want $200-$300? Ugh!
I've found used ones priced very reasonable but I really want to go new on this one if I can.
Appreciate any and all input.
Cheers, Greg

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[bucket]

You can take those things apart, clean them, apply new grease and they are as good as new.

 

[bucket]

Mine is a '79 so it doesn't have the extra wire, but I think the guts are the same.

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[GregL]

Hmmm?
Maybe I'll give it try. Mine is leaking vacuum and won't make the proper transfers to the hoses.

 

[GregL]

Well, it was pretty dry. Cleaned it , re-greased it, all back together now. Just waiting for the epoxy to dry and I'll give it a test!

 

[RecklessWOT]

Well, it was pretty dry. Cleaned it , re-greased it, all back together now. Just waiting for the epoxy to dry and I'll give it a test!

Yeah they're pretty simple mechanisms, not a lot that can make them irreparable unless you completely crushed or melted the thing. Hopefully that's all you need to do for another 30+ years of service lol

 

[16927]

I did the same thing with my reverse light switch on my 1981 C10 three on the tree.... would only work in certain positions of the shifter. Couldn’t find a new one anywhere. Took it apart and cleaned and regressed with die electric grease, been working great.

 

[Grit dog]

^ These responses and knowledge are what makes this a great place!
Hadn't considered it and hopefully don't need to for a while (ever), but now I know they can be "rebuilt."

 

[GregL]

****!
No luck. Let the switch set up overnight. Fired up the truck this morning and hooked up the vac plug top the switch before re-installing. Worked it through all positions and nothing moved. Same problem as before. However, if I jumper each position on the plug with a vacuum line from the plug's vacuum source, all positions move as they're supposed to. There is something wrong with this switch.

 

[GregL]

Ugh!
I'm getting something wrong here and having trouble deciding what the real problem is. I used this vacuum schematic for 1977 K20 with C60 HVAC.

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It clearly shows the vac connector port numbers:

1-Gray
2-Tan
3-Blue
4-Orange
5-Black

But when I look at my factory vac plug with all the hoses still in their factory spots and then check the corresponding numbers molded on the switch I have:

3-Blue
4-Black
5-Orange
6-Tan
9-Gray

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Anybody happen to have one of these apart right now? What the heck am I missing? My truck HVAC system looks completely stock but does not match up at all with the schematic.
Cheers, Greg

 

[bucket]

The illustration on that schematic looks like 80's with the rotational type vacuum switch.

When you had yours apart, did you take out the little slidey vacuum plate doohickey?

 

[GregL]

Yes I did. Took a pic, made sure it went back in the same way.
I agree, the vac connector in this schematic looks like it's for a different truck.

 

[Craig 85]

This guy sells re-conditioned ones. FYI part # 362590 was superseded by #470333. The second link is for his ebay listing. Says it's the last one.

http://thepartguy.com/ac-controls-chevytruck.htm#76-77ac

https://www.ebay.com/itm/401693655835?hash=item5d86cec31b:g:N-QAAOSw1phdGqM5
A/C Heater Master Switch
(GM # 362590/362591)
Reconditioned
$125 RECONDITIONED

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Classic Industries says they have one coming soon, but I wouldn't hold my breath. I've been waiting a year for a tailgate band.

https://www.classicindustries.com/product/470333.html

New $129.99

 

[GregL]

Thanks Craig.
I bit the bullet and bought the NOS switch on eBay for $175.

 

[mtbadbob]

My '87 doesn't blow throught the defroster, so I gotta figure that out also. I did swap the heater control, but to no avail. It looks like all hoses & wires are there & correct, just won't blow air to the windshield.