Eddie Henson
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• Cordova, TN, USA |
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• Registered on 12/8/2004 |
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• 122 posts |
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 Posted:6/8/2005 00:24 |
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Hi all
I having been searching this site and others to try and find info on the auto heater shutoff valve. Anyone here running this on their X and can help locate the parts required? Also, if my memory serves me correctly, this little mod somehow helps the a/c system cool better. Is this true and is it worth the time/effort/money to do this. With the temps rising day/day in the Memphis area, I'm looking for a little help cooling the X down better. Thanks in advance for the replies.  
Eddie Henson
2000 Ford Excursion XLT 7.3L PSD
203 degree Thermo; Factory Tech valve body; CCV mod; HX mod; Rancho RS9000 shocks; Shimmed FPR @ 67; Walker BTM; Evans NPG Coolant; Dieselsite Coolant Filter Kit; Dieselsite Heater Shutoff Valve; Zoodad Mod; WeatherTech In-channel Visors; Acetoned Badges; PSD Badges; Landyot's Gen II Radius Rods
"If you don't like America, Get the hell out !!" - John Rich |
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Ozzie
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• Kansas City Mo., MO, USA |
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• Registered on 5/20/2005 |
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• 15 posts |
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Posted:6/8/2005 06:50 |
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I am not sure about this on the Ex, but I'm a commercial heating and cooling person.
The valve would be part of a tempering or mixing valve for hot and cold air. The valve should be 100% shut off I would think, unless it is not working.
If you are getting a 30 to 40 degree drop across the coil, (cabin temp, versus outlet air temp on Max air, or air not brought in from outside and tempered that way.)
In our homes, it is a 20 degree drop.
This is not my field, so if I am off a little please don't jump all over me. 
Oz |
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JohnBoy
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• DFW, TX, USA |
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• Registered on 9/3/2002 |
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• 972 posts |
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Posted:6/8/2005 07:08 |
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Eddie - have heard good things about this mod...
and also CHP reports that insulating the rear air lines under the EX helps as well....
as soon as I have a moment - I too am tacklng these two....
rumor has it that it gets hot in Dallas as well 
2005 6.0L 4x4 Eddie Bauer Ex
2003 6.0L 4x4 Limited Ex - traded in (BooHoo )
"The Republicans should back off and let men marry men, women marry women, and legalize abortion. In three generations there would be no Democrats." |
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CHPMustang
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• Plano, TX, USA |
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• Registered on 7/24/2002 |
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• 1,800 posts |
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Posted:6/8/2005 09:20 |
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All Excursions come with the coolant shutoff valve from the factory so there's no need to install one 
When the Excursion is in MAX AC selection there is a small amount of coolant that does make it by and thru the front heater core but what I do each early summer is install a 180 degree elbow to 100% eliminate any hot coolant from going thru the core and it may have benefitted up to a 5 degree drop in vent temps,with the elbow installed the coolant flow continues on it's natural path without creating hot spots in the cylinder heads.
I do however recommend re-insulating all the cold charge AC lines for better cooling efficiency 
I also installed a pusher fan to extract the heat from the AC condensor alot faster which also helped with lowering cold vent temps when at idle or stuck in dead slow traffic 
Any ya'll that needs help post up anytime and if you need to phone me just email me for my contact #
gonna be a warm summer!
Bill
Bill
2002 Excursion XLT-P 4x4 7.3L Powerstroke Diesel
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Eddie Henson
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• Cordova, TN, USA |
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• Registered on 12/8/2004 |
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• 122 posts |
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Posted:6/8/2005 14:43 |
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Hi all,
Thanks for the responses and for setting me straight on this one. Didn't know there was a shutoff already installed on our vehicles. As for re-insulating the lines, Bill did you use the foam insulation found at Home Depot/Lowe's for this? If so what did you secure it with? This sounds like a really good idea. As for the 180 degree elbow, was that installed at the lines going into the heater core just to make a loop for the fluid to flow through? Although the air conditioner works fairly well on my X, I think it could do a little better. . Thanks again for reading
Eddie Henson
2000 Ford Excursion XLT 7.3L PSD
203 degree Thermo; Factory Tech valve body; CCV mod; HX mod; Rancho RS9000 shocks; Shimmed FPR @ 67; Walker BTM; Evans NPG Coolant; Dieselsite Coolant Filter Kit; Dieselsite Heater Shutoff Valve; Zoodad Mod; WeatherTech In-channel Visors; Acetoned Badges; PSD Badges; Landyot's Gen II Radius Rods
"If you don't like America, Get the hell out !!" - John Rich |
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CHPMustang
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• Plano, TX, USA |
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• Registered on 7/24/2002 |
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• 1,800 posts |
• 1
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Matt Cawson
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• Caledonia, MI, USA |
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• Registered on 10/20/2004 |
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• 82 posts |
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Posted:6/9/2005 09:00 |
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I don't know a ton about A/C (no pun intended), but what good does it do to insulate the rear lines when the refrigerant doesn't get cold until it expands anyway? Seems like you'd want to keep the return (low pressure) line un-insulated so that the heat can dissipate on the way back? Just curious. I've been having a few issues of my own so I'm trying to better understand how this thing works! |
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CHPMustang
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• Plano, TX, USA |
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• Registered on 7/24/2002 |
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• 1,800 posts |
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Posted:6/9/2005 09:33 |
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First off I'm in no way an air conditioning guru just a shadetree engineer
I think of the cold lines as feeding to my icebox in a sense. I want to keep as much of the cold in the line as possible till it hits the evaporator and if I have to upgrade the insulation to accomplish the task I surely will.
I had thought of insulating the hot line so the condensor can extract the heat more efficiently but just didn't want to do the added work but doesn't rule out I won't do it in the future 
Here's a quick schematic of the AC system
1 19D701 A/C Charge Valve Port (Low Side)
2 19E561 A/C Cycling Switch
3 19C836 Suction Accumulator/Drier
4 19703 A/C Compressor
5 19D644 A/C Compressor Pressure Relief Valve
6 19D594 A/C Pressure Cutoff Switch
7 19D701 A/C Charge Valve Port (High Side)
8 19712 A/C Condenser Core
9 19D990 A/C Evaporator Core Orifice
10 19860 A/C Evaporator Core
11 — Low Pressure Vapor
12 — High Pressure Vapor
13 — Low Pressure Liquid
14 — High Pressure Liquid
Bill
2002 Excursion XLT-P 4x4 7.3L Powerstroke Diesel
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Eddie Henson
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• Cordova, TN, USA |
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• Registered on 12/8/2004 |
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• 122 posts |
• 1
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Posted:6/9/2005 19:31 |
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Hey Bill,
Thanks for the advice and the pics. Just got through reading your post on insulating the a/c lines and installing a pusher fun around the condensor to help wih air flow over the coils. Mighty fine article. Pics you posted helped, too (woth a thousand words, you know ). I'll be making a trip to Home Depot this weekend and gathering up the needed supplies in hopes of a cooler ride. Once again, THANKS!!!
Eddie Henson
2000 Ford Excursion XLT 7.3L PSD
203 degree Thermo; Factory Tech valve body; CCV mod; HX mod; Rancho RS9000 shocks; Shimmed FPR @ 67; Walker BTM; Evans NPG Coolant; Dieselsite Coolant Filter Kit; Dieselsite Heater Shutoff Valve; Zoodad Mod; WeatherTech In-channel Visors; Acetoned Badges; PSD Badges; Landyot's Gen II Radius Rods
"If you don't like America, Get the hell out !!" - John Rich |
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CHPMustang
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• Plano, TX, USA |
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• Registered on 7/24/2002 |
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• 1,800 posts |
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Posted:6/9/2005 20:29 |
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One thing I've noticed with modifications is the warmer it gets out the colder the vent temps drop
Just got in from running out to DFW airport it was 95 degrees with 59% humidity,front vent temps ranged from 42 to 47 degrees which is pretty low compared to the high 50's-low 60's I was getting when the system was untouched 
Anything I can do lemme know
Bill
Bill
2002 Excursion XLT-P 4x4 7.3L Powerstroke Diesel
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