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Home » Public Forums » GMCnet » [GMCnet] WE ALL NEED MORE AIR
Re: [GMCnet] WE ALL NEED MORE AIR [message #320689 is a reply to message #320582] Wed, 19 July 2017 20:55 Go to previous messageGo to previous message
Thomas Pryor is currently offline  Thomas Pryor   United States
Messages: 143
Registered: January 2011
Karma:
Senior Member
After reviewing the available schematics of 73 Thru 78 all versions
supplymake-up air to the same location.
They all pressurize the box from a single squirrel cage fan located on the
side of the box.

MAKE UP AIR and VENTING were some of the major changes in 77/78, along with
other non- air related improvements. . Neither of these would be
impediments to this modification, IMHO.

The Modification that I am suggesting:

1. Pressurizes the box with makeup air from only one
source.........INSIDE RECIRCULATING AIR.


2. The air direction now enters thru the front of the box, in the most
advantageous direction. Air entering the OEM design has at least two
restrictions BEFORE reaching the A/C or heater coil. This MOD significantly
remedies that flaw.

3. The journey requires easily accessible items: A) Block off all
unused external HVAC box passages, B) make and install the necessary
duct work, C) hook up HI, MED & LOW from old wires Resister wires to the
new resistor pack on the MCC 515 fan/motor assy.
4. Nothing in the Dash control assembly requires any attention.

5. For those who have the a pre 77/78 with no Recirculation feature,
this becomes a major improvement.

HOW CAN I HELP?-


--
Regards,

Tom Pryor
4188 Limerick Dr
Lake Wales, Fl 33859
Cell 248 470 9186

Living on a waterfront is not a matter of life or death. Its more
important than that.
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