| Re: [GMCnet] Anyone ever put a 78 dash heater/AC in a 73? [message #321814] |
Tue, 08 August 2017 16:52  |
James Hupy
Messages: 6806
Registered: May 2010
Karma:
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Senior Member |
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Most of these coach dashes are held together by bailing wire and dum-dum
putty regardless of what year model they are. They all squeak and rattle,
the vacuum doors are non functioning or the felt flap seals are missing or
deteriorated so bad that they leak badly. Combine that with dash controls
and vacuum hoses that are in poor shape, and you get the picture. The
heat/defrost/Air conditioning has deteriorated to the point of non
functioning. The fix???? Rip it all out and rebuild it all. Not a job for
the faint of heart. Band-Aids won't work here, neither will mickey mouse
fixes. Spend some money and do it the best way possible. You won't regret
it.
Jim Hupy
Salem, Or
78 GMC ROYALE 403
On Aug 8, 2017 2:29 PM, "Jon Roche" wrote:
I could be wrong, but it is not just the external hvac box that is
different, but the ducting in the dash. I dont think it would be feasable
without destroying the dash and rebuilding.
Look at the write up tom pryor just had on the forum adding a dual
fan/blower to fix the hvac problems. I think he has something with that
and am
planning on doing that to my 75.
--
Jon Roche
75 palm beach
St. Cloud, MN
http://lqqkatjon.blogspot.com/
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