Is there an alterternative to roof air?

P

philip l. stewart

New member
Dec 16, 1997
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Eric,

I believe you and Donald are correct in suggesting that there must be an
improvement possible to the stock dash air handling system.

On my '76 Transmode with the type two upgrade center auxillary air
outlets there is woefully poor air flow from the two vents. However,
when ever I take off the plastic plenum hanging under the dash and run
the AC on max, there is a veritable hurricane of frosty air blasting out
of the evaporerator/ blower box. Unfortunately without the plemum the
air flow is directed straight out onto the floor and it quickly is lost
into the living area and does not provide much relief to the occupants
of the cab.

There must be a way of directing more of the air to the driver and
passenger seats. Expirements with cardboard boxes and tubing temporarly
taped to the under dash outlets show that in my coach dash air comfort
is a possibilty. The problem is how to do a modification that is neat,
attractive and doesn't ruin the appearance to the otherwise well
designed and eye pleasing GMC dash. Any one have any ideas on this?

BYW, I saw a coach where Zeb Frady of Southland Mohtorhome Center in
Buford GA had installed an auxillary evaporator and blower box on the
sloped floor board in the center of cab under the dash. It looked like
an commercially available unit and Zeb said that it greatly improved
cooling of the cab and coach. Anyone interested could get more details
by calling Zeb.

Phil Stewart
 
I have a 1977 Eleganza with the "improved" air flow. I am still
disappointed with the air flow. I attended a seminar several years ago
given by Duane Simmons called "Separating Hot From Cold" which told
about A/C airflow theory & maintenance. I went through the system at
that time & resealed it completely. I have an external ball valve to
control heater water flow. I need to look at the system again I guess.

We used to travel to Phoenix with a daughter at ASU. We added a
supplemental evaporator under the street side couch. I blow very cold
air. I may add either a similar unit in the cockpit or a small unit
under the copilot chair in the metal box.

For everyone's info:
The supplemental evaporator is an SCS/Frigette Model U4034 purchased in
1994.
Address: SCS/Frigette; PO Box 40557; Fort Worth; TX 76134 (817)
293-8014
URL: www.scsfrigette.com
Purchase at Hal's Auto Air in Sacramento, CA

I mounted the evaporator and the A/C lines. The A/C shop the installed
two compression T's to integrate in the dash air.

Eric Tipton

-----Original Message-----
From: Philip L. Stewart [SMTP:plstewrt]
Sent: Wednesday, August 19, 1998 8:59 PM
To: gmcmotorhome
Subject: GMC: Re; Is there an alterternative to roof air?

Eric,

I believe you and Donald are correct in suggesting that there
must be an
improvement possible to the stock dash air handling system.

On my '76 Transmode with the type two upgrade center auxillary
air
outlets there is woefully poor air flow from the two vents.
However,
when ever I take off the plastic plenum hanging under the dash
and run
the AC on max, there is a veritable hurricane of frosty air
blasting out
of the evaporerator/ blower box. Unfortunately without the
plemum the
air flow is directed straight out onto the floor and it quickly
is lost
into the living area and does not provide much relief to the
occupants
of the cab.

There must be a way of directing more of the air to the driver
and
passenger seats. Expirements with cardboard boxes and tubing
temporarly
taped to the under dash outlets show that in my coach dash air
comfort
is a possibilty. The problem is how to do a modification that
is neat,
attractive and doesn't ruin the appearance to the otherwise well
designed and eye pleasing GMC dash. Any one have any ideas on
this?

BYW, I saw a coach where Zeb Frady of Southland Mohtorhome
Center in
Buford GA had installed an auxillary evaporator and blower box
on the
sloped floor board in the center of cab under the dash. It
looked like
an commercially available unit and Zeb said that it greatly
improved
cooling of the cab and coach. Anyone interested could get more
details
by calling Zeb.

Phil Stewart
 
Eric:

Was the seminar by Duane any different than the one by the same name
that Zay Brand gave at the Mar 97 GMCMI Boerne Rally?

Paul Bartz

From: Tipton, Eric [mailto:ETipton]
Sent: Thursday, August 20, 1998 12:09 AM
Subject: RE: GMC: Re; Is there an alterternative to roof air?

I have a 1977 Eleganza with the "improved" air flow. I am still
disappointed with the air flow. I attended a seminar several years ago
given by Duane Simmons called "Separating Hot From Cold" which told
about A/C airflow theory & maintenance. I went through the system at
that time & resealed it completely. I have an external ball valve to
control heater water flow. I need to look at the system again I guess.
We used to travel to Phoenix with a daughter at ASU. We added a
supplemental evaporator under the street side couch. I blow very cold
air. I may add either a similar unit in the cockpit or a small unit
under the copilot chair in the metal box.
For everyone's info:
The supplemental evaporator is an SCS/Frigette Model U4034 purchased in
1994.
Address: SCS/Frigette; PO Box 40557; Fort Worth; TX 76134 (817)
293-8014
URL: www.scsfrigette.com
Purchase at Hal's Auto Air in Sacramento, CA

I mounted the evaporator and the A/C lines. The A/C shop the installed
two compression T's to integrate in the dash air.
Eric Tipton

From: Philip L. Stewart [SMTP:plstewrt]
Sent: Wednesday, August 19, 1998 8:59 PM
Subject: GMC: Re; Is there an alterternative to roof air?

Eric,
I believe you and Donald are correct in suggesting that there must be an
improvement possible to the stock dash air handling system. On my '76
Transmode with the type two upgrade center auxiliary air outlets there
is woefully poor air flow from the two vents.

However, when ever I take off the plastic plenum hanging under the dash
and run the AC on max, there is a veritable hurricane of frosty air
blasting out of the evaporator/ blower box. Unfortunately without the
plenum the air flow is directed straight out onto the floor and it
quickly is lost into the living area and does not provide much relief to
the occupants of the cab. There must be a way of directing more of the
air to the driver and passenger seats. Expirements with cardboard boxes
and tubing temporarily taped to the under dash outlets show that in my
coach dash air comfort is a possibilty. The problem is how to do a
modification that is neat, attractive and doesn't ruin the appearance to
the otherwise well designed and eye pleasing GMC dash. Any one have any
ideas on this?

BYW, I saw a coach where Zeb Frady of Southland Motorhome Center in
Buford GA had installed an auxillary evaporator and blower box on the
sloped floor board in the center of cab under the dash. It looked like
an commercially available unit and Zeb said that it greatly improved
cooling of the cab and coach. Anyone interested could get more details
by calling Zeb.

Phil Stewart
 
I believe that they are either the same or very similar. I think Zay
may have been involved in Duane's talk. This seminar was at a GMC
Western States rally at Lake Tahoe several years back.

Eric Tipton

-----Original Message-----
From: Bartz, Paul [SMTP:s9d3452]
Sent: Thursday, August 20, 1998 6:36 AM
To: 'gmcmotorhome'
Subject: RE: GMC: Re; Is there an alterternative to roof
air?

Eric:

Was the seminar by Duane any different than the one by the same
name
that Zay Brand gave at the Mar 97 GMCMI Boerne Rally?

Paul Bartz

From: Tipton, Eric [mailto:ETipton]
Sent: Thursday, August 20, 1998 12:09 AM
Subject: RE: GMC: Re; Is there an alterternative to roof air?

I have a 1977 Eleganza with the "improved" air flow. I am still
disappointed with the air flow. I attended a seminar several
years ago
given by Duane Simmons called "Separating Hot From Cold" which
told
about A/C airflow theory & maintenance. I went through the
system at
that time & resealed it completely. I have an external ball
valve to
control heater water flow. I need to look at the system again I
guess.
We used to travel to Phoenix with a daughter at ASU. We added a
supplemental evaporator under the street side couch. I blow
very cold
air. I may add either a similar unit in the cockpit or a small
unit
under the copilot chair in the metal box.
For everyone's info:
The supplemental evaporator is an SCS/Frigette Model U4034
purchased in
1994.
Address: SCS/Frigette; PO Box 40557; Fort Worth; TX 76134 (817)
293-8014
URL: www.scsfrigette.com
Purchase at Hal's Auto Air in Sacramento, CA

I mounted the evaporator and the A/C lines. The A/C shop the
installed
two compression T's to integrate in the dash air.
Eric Tipton

From: Philip L. Stewart [SMTP:plstewrt]
Sent: Wednesday, August 19, 1998 8:59 PM
Subject: GMC: Re; Is there an alterternative to roof air?

Eric,
I believe you and Donald are correct in suggesting that there
must be an
improvement possible to the stock dash air handling system. On
my '76
Transmode with the type two upgrade center auxiliary air outlets
there
is woefully poor air flow from the two vents.

However, when ever I take off the plastic plenum hanging under
the dash
and run the AC on max, there is a veritable hurricane of frosty
air
blasting out of the evaporator/ blower box. Unfortunately
without the
plenum the air flow is directed straight out onto the floor and
it
quickly is lost into the living area and does not provide much
relief to
the occupants of the cab. There must be a way of directing more
of the
air to the driver and passenger seats. Expirements with
cardboard boxes
and tubing temporarily taped to the under dash outlets show that
in my
coach dash air comfort is a possibilty. The problem is how to
do a
modification that is neat, attractive and doesn't ruin the
appearance to
the otherwise well designed and eye pleasing GMC dash. Any one
have any
ideas on this?

BYW, I saw a coach where Zeb Frady of Southland Motorhome Center
in
Buford GA had installed an auxillary evaporator and blower box
on the
sloped floor board in the center of cab under the dash. It
looked like
an commercially available unit and Zeb said that it greatly
improved
cooling of the cab and coach. Anyone interested could get more
details
by calling Zeb.

Phil Stewart
 
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