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73-87 Chevy _ GMC Trucks => Interior & Equipment => Heating, Ventilation & Air Conditioning (HVAC) => Topic started by: Grey73 on March 19, 2013, 06:00:19 am

Title: AC control problems for a 73
Post by: Grey73 on March 19, 2013, 06:00:19 am

On my 73 C10 the AC/heater control has a leaking vacuum selector. I can't seem to find a replacement. Does anyone have any ideas?

Title: Re: AC control problems for a 73
Post by: bake74 on March 19, 2013, 09:11:40 am

     E-mail the store on this site and see if Capt. Has any sources.

Title: Re: AC control problems for a 73
Post by: Captkaos on March 19, 2013, 04:20:08 pm

This: http://www.classicparts.com/1985-91-Heater-A_C-Vacuum-Selector-Switch/productinfo/68-338/#.UUjWQBc3uE4

Title: AC control problems for a 73
Post by: Grey73 on March 25, 2013, 06:19:28 am

Thanks! That should get me fixed up!

Title: AC control problems for a 73
Post by: Grey73 on March 28, 2013, 09:32:05 pm

Sorry guys. This is the valve I am looking for. It runs off the hot/cold selector. Any ideas?

Title: Re: AC control problems for a 73
Post by: bd on March 28, 2013, 10:08:19 pm

AC/heater vacuum mode switch.  Try to procure a part number from a local Chev/GMC dealer.  Ask them to search it on their national parts locator network for a dealer with NOS (unlikely, but you might get a hit).  At least then you'll have a part number for Google.

As a last resort if a replacement can't be found, you can carefully take the switch apart and lap the mating faces with 400 then 600 grit laid over a flat glass pane to assure a plane surface.  Be careful with the retaining clip, because it's also the spring that draws the two halves together for a good vacuum seal.  Reassemble with a dab of thick (almost dry) moly or graphite grease.

Title: AC control problems for a 73
Post by: Grey73 on March 29, 2013, 11:26:48 pm

I'll try that and post back my results.
Thanks?