| Type II (75,76) HVAC changes. [message #329855] |
Fri, 09 March 2018 14:06  |
Bill Van Vlack
Messages: 419
Registered: September 2015
Location: Guemes Island, Washington
Karma: 14
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Our 76 Royale has a broken AC compressor that I haven't worried about since we were able to suffer through that once a year day here in the Pacific NW where we would have appreciated dash AC. Now that we've decided to do our first long trip (to Tucson for the Convention), it got me to thinking about how do deal with hot weather in general and dash AC in particular.
I've been reading up on modifications folks have made to the Type II HVAC system to improve AC performance and have found quite a few approaches. The one that seems to offer the simplest solution Mark Wall's approach here:
https://www.gmcmi.net/wp-content/uploads/2013/02/HVAC-Systems.pdf
I figure just doing the fan relocation and recirc modifications he describes seems like a (relatively) easy way to get most of the benefits without making substantial changes to the internals of the hvac box and mods to the dash distribution plenums.
The fan gets relocated to the front of the box and a recirc path is established via a short connection from the sloped floor to the box. These seem doable without too much trauma, remove three of the six changes in air direction, and take advantage of cooled air in the cockpit.
The only downside I've seen discussed is that the fan motor might suffer from moisture picked up from the evap coil, since it ends up on the suction side of the fan.
Thoughts???
Bill Van Vlack
'76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath, Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o mid November 2015.
[Updated on: Sun, 11 March 2018 11:38] Report message to a moderator |
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| Re: Hot under the collar... [message #329879 is a reply to message #329855] |
Sat, 10 March 2018 11:39  |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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For one trip to Tucson? I believe I'd simply spin off the onan, fire up the roof A/C, and boogie.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: Hot under the collar... [message #329888 is a reply to message #329855] |
Sat, 10 March 2018 14:37 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
Karma: -74
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Senior Member |
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Mine works. Airflow picks. If I were upgrading, I'd outboard an evaporater and a fanwith an easy path, there's plenty of capacity in the compressor. Most of the components can be had out of an earlier Suburban with the rear a/C option.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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