| Re: [GMCnet] HVAC Doors [message #362576] |
Sun, 28 February 2021 16:38  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
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Senior Member |
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Greg,
Another thought: You may find this chart, a color coded version of the
original in the service manual, useful. Since I completely replaced my
HVAC system years ago, I don't remember the operation of the original.
But, from this chart, it appears to me that your belief that the default
position is DEFROST may be incorrect:
bit.ly/3aZNZq7
or
http://www.gmcmhphotos.com/photos/type-ii-dash-air-condition-modification/p19227.html
Ken H.
On Sun, Feb 28, 2021 at 5:31 PM Ken Henderson
wrote:
> Greg,
>
> The doors undoubtedly need new seals, and the evaporator probably needs
> cleaning, so removing the front as you suggest is a good idea. But, you'll
> gain access only to the doors themselves -- not the actuators. Those are,
> unfortunately, quite well hidden behind the dash. You CAN get to them, but
> not as easily as you're hoping -- so what else is new? :-)
>
> Ken H.
>
>
> On Sun, Feb 28, 2021 at 4:58 PM Greg Crawford via Gmclist gmclist@list.gmcnet.org> wrote:
>
>> If I remove the radiator overflow tank and the windshield washer fluid
>> tank, can I take the front off the HVAC box and access the flapper doors?
>>
>> None of mine work, probably due to the vacuum leak at the control, and it
>> blows out the dash vents in Heat, Vent, and AC positions.
>>
>> I've read that the system defaults to defrost, but mine does not, so it
>> makes me think the door is stuck.
>>
>> If I can get the doors to work, I'm thinking about trashing the original
>> HVAC controls and doing this:
>>
>>
>> https://sites.google.com/site/darbyselky/home/electronic-hvac-controls?authuser=0
>>
>>
>> --
>> Greg Crawford
>> KM4ZCR
>> Knoxville, TN
>>
>> "Ruby Sue"
>> 1977 Royale
>> Rear Bath
>> 403 Engine
>> American Eagle Wheels
>> Early Version Alex Sirum Quad bags
>>
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>
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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