| Dash Air question [message #131282] |
Tue, 21 June 2011 12:00  |
Bill W
Messages: 21
Registered: July 2005
Location: Sheboygan, WI
Karma: 0
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Junior Member |
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The guy working on the dash air in my 77 Royale thinks the orifice tube may be clogged. Any idea where he'll find it in the lines? He's got the manual but that's not helping him. The system was switched to R134 several years ago but never really worked. Other ideas?
Thanks
Bill Wetzel
77 Royale 26RB
Sheboygan, WI
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| Re: [GMCnet] Dash Air question [message #131306 is a reply to message #131282] |
Tue, 21 June 2011 13:47  |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Senior Member |
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Pg. 1B12 of X-7725 manual, figure 13 shows the thermostatic expansion
valve -- inside the HVAC box under the R. hood. There is no orifice
tube unless the R134a modification was exceptional.
Ken H.
On Tue, Jun 21, 2011 at 1:00 PM, Bill Wetzel <bpwetzel@charter.net> wrote:
>
>
> The guy working on the dash air in my 77 Royale thinks the orifice tube may be clogged. Any idea where he'll find it in the lines? He's got the manual but that's not helping him. The system was switched to R134 several years ago but never really worked. Other ideas?
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Ken Henderson
Americus, GA
www.gmcwipersetc.com
Large Wiring Diagrams
76 X-Birchaven
76 X-Palm Beach
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| Re: [GMCnet] Dash Air question [message #131453 is a reply to message #131282] |
Wed, 22 June 2011 12:47 |
Jim Miller
Messages: 501
Registered: March 2008
Karma: 10
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Senior Member |
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On Jun 21, 2011, at 1:00 PM, Bill Wetzel wrote:
> The guy working on the dash air in my 77 Royale thinks the orifice
> tube may be clogged. Any idea where he'll find it in the lines?
> He's got the manual but that's not helping him. The system was
> switched to R134 several years ago but never really worked.
Bill,
Was your system evacuated and held under vacuum for a while before it
was charged the last time?
Non-condensibles present in the system - such as water vapor - can
cause blockage symptoms; you'll get cooling initially but then ice
builds up in narrow passages and blocks the flow of refrigerant.
BTW, the R134 conversion on my Eleganza never worked well - it cooled
poorly and squealed the belt when the clutch engaged. We went with
Duracool instead - it is fabulous!
--Jim
1977 Eleganza II
1977 Royale
Hamilton, OH
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Jim Miller
1977 Eleganza II
1977 Royale
Hamilton, OH
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| Re: Dash Air question [message #132046 is a reply to message #131282] |
Sat, 25 June 2011 23:58 |
Bill W
Messages: 21
Registered: July 2005
Location: Sheboygan, WI
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Thanks for the information. I have the Duracool ordered so we'll see what happens.
Bill Wetzel
77 Royale 26RB
Sheboygan, WI
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