| defrost on all the time [message #188541] |
Sun, 28 October 2012 16:02  |
skip2
Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...
Karma: 3
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Finally got my dash air system back on line but have what seems to be a continual leak from heat and dash venting into the defrost circuit. The defrost servo seems to be working fine because when you put it on defrost the flow really increases/ have checked all the vacum hoses and what they are suppose to do at each switch setting and that all checks out. Any ideals on this. I've heard that 73 ahnd 74 dash airs weren't that great if it can't easily be repaired without dismantling dash I'll just use my clip on fans to move it from the top of the dash to the occupants. Thanks.
Skip Hartline
74 Canyon Lands, FiTech,
3.7 FD LSD, Manny Tranny,
Springfield Distributor,
2001 Chevy Tracker Ragtop Towd
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| Re: defrost on all the time [message #188547 is a reply to message #188541] |
Sun, 28 October 2012 16:20  |
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mike miller
Messages: 3576
Registered: February 2004
Location: Hillsboro, Oregon
Karma: 0
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| skip2 wrote on Sun, 28 October 2012 14:02 |
Finally got my dash air system back on line but have what seems to be a continual leak from heat and dash venting into the defrost circuit. The defrost servo seems to be working fine because ...
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Most likely bad sealing on the flaps inside the heater box. They are made of foam and it has been like 35 years.
Mike Miller -- Hillsboro, OR -- on the Black list
(#2)`78 23' Birchaven Rear Bath -- (#3)`77 23' Birchaven Side Bath
More Sidekicks than GMC's and a late model Malibu called 'Boo'
http://m000035.blogspot.com
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| Re: [GMCnet] defrost on all the time [message #188551 is a reply to message #188541] |
Sun, 28 October 2012 17:01 |
Ken Henderson
Messages: 8726
Registered: March 2004
Location: Americus, GA
Karma: 9
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Skip,
Take a look at
http://www.gmcmhphotos.com/photos/new-dash-panel/p23846-view-of-the-plastic-da.html
See that rectangular hole in the bottom of the dash assembly? There's a
flap in there that swings aft for Defrost & fwd for Heat/Air. That's what
the servo moves. I seriously doubt that you want to remove that assembly
to correct the problem, which might be a damaged hinge, an obstruction, or
several other possibilities. Even getting to the servo to check its
operation or R&R it would be a daunting task.
Enjoy your frost-free windshield.
JMHO,
Ken H.
On Sun, Oct 28, 2012 at 5:02 PM, Skip Hartline wrote:
>
>
> Finally got my dash air system back on line but have what seems to be a
> continual leak from heat and dash venting into the defrost circuit. The
> defrost servo seems to be working fine because when you put it on defrost
> the flow really increases/ have checked all the vacum hoses and what they
> are suppose to do at each switch setting and that all checks out. Any
> ideals on this. I've heard that 73 ahnd 74 dash airs weren't that great if
> it can't easily be repaired without dismantling dash I'll just use my clip
> on fans to move it from the top of the dash to the occupants. Thanks.
>
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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] defrost on all the time [message #188553 is a reply to message #188551] |
Sun, 28 October 2012 17:26 |
skip2
Messages: 544
Registered: September 2011
Location: Winter Haven,FL (center o...
Karma: 3
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Senior Member |
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Anyone that remembers 8 tracks, rememebers how fast foam rubber dries out especially in a heated enviroment. Might as well look on the bright side, I set out just so I would have defrosters. Be careful what you wish for. Not complaining, for an added bonus all I did was charge an inoperative AC and plug in the compressor and gauge readings right on the money and no funny noises, cold air blowing and water, not coolant, dripping out of the blower box.
Skip
74 Canyon Lands, FiTech,
3.7 FD LSD, Manny Tranny,
Springfield Distributor,
2001 Chevy Tracker Ragtop Towd
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