| [GMCnet] Re: Dash air conditioning [message #364836 is a reply to message #364835] |
Sat, 19 June 2021 09:23   |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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It is not that any GMC AC system is bad. For the era in which they were
designed and used, (40+ years ago) they were state of the art.
But modern cars have many improvements that the GMC didn’t have. The
biggie? Space!
Inside the GMC is a huge, essentially non insulated, glass enclosed
cavern. Compare that to a modern car, well insulated, 1/4 the size,
darkened glass, and computer controlled systems.
Like comparing eggs to oranges. More differences than similarities.
Can the GMC be improved? Sure can. First, reduce the space that needs
cooled.
Leave that A6 compressor alone. It will cool a 3 bedroom house. Make
sure that all your vacuum motors that open and close work. Most do not.
Insure that all the felt seals/wipers on the edges of the vacuum doors are
intact. Most aren't. Be sure all the cables and controls work properly.
Make darn sure that your hot water to the heater core shuts off completely.
Those in-line vacuum controlled valves usually allow quite a bit of hot
coolant to circulate even when turned off. Many owner report that just
installing a manually operated bypass loop in those two lines made a huge
difference in AC function.
Ok, so you do all that, and you wife's hot flashes still override the
capabilities of the AC system. GOOD LUCK WITH THAT ONE!!.
Jim Hupy
Salem, Oregon
On Sat, Jun 19, 2021, 6:42 AM John R. Lebetski
wrote:
> The ducting changed over the years. With a 76 you should have that
> “add-on” lower max air duct GM used until the 77 redesign. If that is
> working
> you shouldn’t need to do more duct changes.
> --
> John Lebetski
> Woodstock, IL
> 77 Eleganza II
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