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| Re: [GMCnet] Heater Core Shut Off Valve [message #216924 is a reply to message #216898] |
Sun, 04 August 2013 18:10   |
Ronald Pottol
Messages: 505
Registered: September 2012
Location: Redwood City, California
Karma: -2
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Senior Member |
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That responds slowly. Given a driver with a poor mental model, they will go
nuts. Think of the sort of person who turns the heater up to 90 so the
house will warm up faster.
On Aug 4, 2013 2:00 PM, "A." <markbb1@netzero.com> wrote:
>
>
> n6mon wrote on Sun, 04 August 2013 12:40
> > Saw this on one the car customizing TV shows today. It is
> > an electrically operated valve to completely shut off the
> > flow of water to the heater core.
> >
> > <http://www.heatertreater.net/magento/index.php/core-regulator.html>
> For the life of me, I don't undertand why the GMC uses a "temperature
> door" to mix hot and cold air in the blower box, PLUS a vacuum actuator to
> turn heater core coolant flow on and off.
>
> All you need is one of these in the line connected to the temp slider
> cable, and forget about BOTH the door AND the vacuum actuator:
>
> http://www.bpeusa.com/images/3115NEW_small.jpg
>
> --
> '73 23' Sequoia For Camping
> '73 23' CanyonLands For Sale
> UA (Upper Alabama)
> "Time is money. If you use YOUR time, you get to keep YOUR money."
> _______________________________________________
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1973 26' GM outfitted
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| Re: [GMCnet] Heater Core Shut Off Valve [message #216927 is a reply to message #216924] |
Sun, 04 August 2013 18:43 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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Senior Member |
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| Ronald Pottol wrote on Sun, 04 August 2013 18:10 |
That responds slowly. Given a driver with a poor mental model, they will go nuts. Think of the sort of person who turns the heater up to 90 so the house will warm up faster.
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Yep. The CFO does that. And nope, it won't change the response time of the system.
There are both types of vehicles out there now, and you could be driving one of each, and you wouldn't know which was which without digging around under the hood.
There isn't any discernable difference in which heats faster. When the car is cold, people get in, push the lever all the way to max and when it starts getting too hot, they turn the fan down, and/or turn down the temp control. No heat comes out until the engine warms up anyway.
Bonus: It will turn off the coolant to the core without an additional valve, saving one vacuum actuator, for one less potential vacuum leak.
For my next trick, I propose a REAL fresh air option, using outside ram air plumbed to dedicated vent ports, with doors that open using two-port vacuum actuators like the existing defroster unit and triggered by the "Vent" setting on the dash control.
Nothing up my sleeve...
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| Re: [GMCnet] Heater Core Shut Off Valve [message #216975 is a reply to message #216936] |
Sun, 04 August 2013 22:11 |
Dennis S
Messages: 3046
Registered: November 2005
Karma: 2
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Senior Member |
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A,
Something like Kelvin's ???
http://www.gmcmhphotos.com/photos/g3409-auxilary-fresh-air-vents.html
Dennis
| A Hamilto wrote on Sun, 04 August 2013 19:33 |
| Harry wrote on Sun, 04 August 2013 19:01 |
I'm going to find an old Studebaker with those opening doors in the front fenders.
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Early 50's Chevrolet pickups had the door behind the hood and right in front of the windshield.
On the GMC, I am talking about something not visible from the interior or exterior (the air inlet itself in/near/around the grill might not be completely invisible).
Do I need to post pictures?
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Dennis S
73 Painted Desert 230
Memphis TN Metro
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| Re: [GMCnet] Heater Core Shut Off Valve [message #217004 is a reply to message #216898] |
Mon, 05 August 2013 08:24 |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
Karma: 7
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Senior Member |
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| A Hamilto wrote on Sun, 04 August 2013 17:00 |
For the life of me, I don't undertand why the GMC uses a "temperature door" to mix hot and cold air in the blower box, PLUS a vacuum actuator to turn heater core coolant flow on and off.
All you need is one of these in the line connected to the temp slider cable, and forget about BOTH the door AND the vacuum actuator: <snipped picture>
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A Hamilto,
I is suddenly and clearly obvious that you are not familiar with automotive HVAC history.
When GM started building our coaches, gasoline was about 1/4 of an hour for a mimimum wage earner. Now it is closer to half. So, running the A/C flat out when you only need half of it was not a big issue.
Yes, there is the change response time as noted, but there is also the fact that re-heating conditioned air makes it more comfortable and the fact that GM always set up the De-Fog to first dry, then heat the de-fogging air for the windshield. This was very effective and they they use it.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Heater Core Shut Off Valve [message #217054 is a reply to message #217004] |
Mon, 05 August 2013 12:24 |
A Hamilto
Messages: 4508
Registered: April 2011
Karma: 39
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Senior Member |
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| Matt Colie wrote on Mon, 05 August 2013 08:24 |
A Hamilto,
I is suddenly and clearly obvious that you are not familiar with automotive HVAC history.
When GM started building our coaches, gasoline was about 1/4 of an hour for a mimimum wage earner. Now it is closer to half. So, running the A/C flat out when you only need half of it was not a big issue.
Yes, there is the change response time as noted, but there is also the fact that re-heating conditioned air makes it more comfortable and the fact that GM always set up the De-Fog to first dry, then heat the de-fogging air for the windshield. This was very effective and they they use it.
Matt
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True that I don't know anything about automotive HVAC history. But all I am saying is that I can control the heat to/through the heater core, lock the "temperature" door in position to allow air through BOTH the heater core and the evaporator ALL THE TIME (eliminate that uneccesary moving part), and the system will do what it always did. It will still reheat conditioned air, and it will still defog the way it always did.
Having driven vehicles with both types of heater control, I can tell you that "response time" difference is not worth quibbling about. My CFO is from MI. Like all the rest of you, she gets in and pushes all the stuff to full and waits for the engine to warm up. And in that situation, there is no difference in how fast either system heats up. Before you know it, you are sweltering. If you are from MI, you sit and sweat and let your eyes dry out. If you are from AL, you adjust the temp slider, defrost/heater ratio, and fan. 
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