| Re: [GMCnet] Heater Box Debris [message #172750 is a reply to message #172742] |
Sat, 09 June 2012 20:53   |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma:
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Senior Member |
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John,
Don't stop now. You can only get to the aft side of the evaporator and
truly clean it by removing the evaporator. It will probably be firmly
"glued" to the panel at the top and require a putty knife, possibly aided
with a heat gun, to break it loose. Then you can pivot it left toward the
hoses so you can clean it.
I don't recall whether your '78 has an outside air opening; if it does,
consider putting <1/2" hardware cloth over it to keep critters out in the
future. If you had a 75'/'76 I'd say close it completely and implement the
recirculate-only mods. With that port closed, any future visitors will
have to enter through the cockpit -- if you really want to make them
unwelcome, you could cover the openings through the firewall while you've
got it all apart.
Or you could just do this:
http://www.gmcmhphotos.com/photos/g5280-dash-air-conditioning-redesign.html
or
http://goo.gl/iEmh4
:-)
Ken H.
On Sat, Jun 9, 2012 at 9:26 PM, John Shotwell wrote:
>
>
> Charlie - I got the front cover off. The two cores look very clean from
> the front. Beats me how that stuff gets in behind there...
>
> John H - I had to remove all that you noted. I didn't realize the bottom
> would come off, but it did.
>
> Rob - Yes, the doubler was there, and slightly bent DOWN in the middle. If
> the holes are centered, I'll just replace it with the crown up - good
> advice! And it looks like there is/was a foam strip all around the
> circumference of the evaporator on the inside of that bottom cover. Now all
> I have to do is find replacement foam for the doors, etc - boy, that old
> foam stuff is nasty!
>
> Dennis - thanks for the link. I have seen those before, but couldn't find
> them today. The ones I saw this week were of the resistors removed, and
> looking like what I found today. I really hate to tear into it any more,
> but I know I should as long as I'm this far. Now that the bottom is off,
> I'll look tomorrow with a mirror at the back side of the evap and see
> what's there. Because I posted a few days ago about the a/c system cycling
> on and off every 20 seconds (low on Duracool), maybe it's just a good time
> to look at it all and replace the things idrob did.
>
> Thanks for all the comments and advice
>
> Shot
>
>
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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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