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Topic: Cabin AC (Read 1003 times) previous topic - next topic

Cabin AC

can anyone direct me to the location of the expansion valve for the cabin air conditioning,  I hate to take the whole front end apart if it isn't necessary
As usual Thanks for all the help
Chris
1999 U 320 DGFE
Build Number 5523
Chris & Elka Lang
In the field, Lonoke AR

Re: Cabin AC

Reply #1 –
As your facing the manifold .. facing the windshield. right side  midway up covered in black insulation of sorts.. might have a pic.. ill look for it and add later if I do

Re: Cabin AC

Reply #2 –
Quote from: Chris m lang –
  I hate to take the whole front end apart if it isn't necessary
Chris,

Not the whole dash but the center section and the removable kick panel that covers the breakers as you come in the door. On your coach it will be just about where the 2 section meet. You will also find the piping to the Aqua Hot heater core there also but the expansion valve can be accessed from behind the hoses. It is almost at flooe level.

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Cabin AC

Reply #3 –
Mike/David do you happen to know what make the expansion valve and filter dryer came out of( Ford,Chevy etc)
Thanks
Chris
1999 U 320 DGFE
Build Number 5523
Chris & Elka Lang
In the field, Lonoke AR

Re: Cabin AC

Reply #4 –
Quote from: Chris m lang –
do you happen to know what make the expansion valve and filter dryer came out of( Ford,Chevy etc)

Chris,

I don't want to seem like an over educated burrow but a boxed/open wrench. Seems like a either a 11/16" or 3/4" for the expansion valve is what fits the fitting nuts.  On second thought you have never seen what you are going to work on and are just trying to get your ducks in a row.  Looking at it that way all you need is just hand tools.

 The dryer is also held in place with a hose fitting nut but I don't remember the size. It is too hot here to crawl up under the coach and get you an exact size right now.

Mike
Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Cabin AC

Reply #5 –
Here is the expansion valve for my 98 u270.
victory systems expansion valve


I think this is the same thing on EBAY.

https://www.ebay.com/itm/New-A-C-Expansion-Valve-1240003-80220S84A02-Accord-Civic-CR-V-Integra-CL-Legen/163083161442?rt=nc&_trkparms=aid%3D555018%26algo%3DPL.SIM%26ao%3D2%26asc%3D52885%26meid%3D10aa6d64fef242ff80126b4435b1d9e9%26pid%3D100005%26rk%3D3%26rkt%3D12%26sd%3D201626680712%26itm%3D163083161442&_trksid=p2047675.c100005.m1851/]New A/C Expansion Valve 1240003 - 80220S84A02 Accord Civic CR-V Integra CL Legen
Rick and Wendy Green
1998 U270 3600 The Coach Formerly known as Princess
Build# 5336
2007 Ford Explorer

Re: Cabin AC

Reply #6 –
I have an extra one.. its the square block type though.. if it works I can ship it

Re: Cabin AC

Reply #7 –
Here is the information on my '99
dash air expansion valve
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Cabin AC

Reply #8 –
Cman,
I knew there were pics. on the site but couldn't remember who posted them.

@ Chris,
These pics. sure show what you are looking for better than my description.
Mike

Pamela & Mike 97 U 320

"It's not what happens to you, but how you react to it that matters."

Re: Cabin AC

Reply #9 –
Thanks Guys, I didn't pull the whole center hump but I did take out 3 screws on right side and pull it back a couple of inches.  Got the expansion valve changed and ordered a receiver drier should be here today.  Hopefully I can be pulling a vacuum on system by late this afternoon.

How long should I pull a vacuum on this large of a system?  On a car I usually pull vacuum for about 1 hour but this system has a lot more volume.
My vacuum pump will pull around 22 to 23 In Hg.
Thanks
Chris
1999 U 320 DGFE
Build Number 5523
Chris & Elka Lang
In the field, Lonoke AR

Re: Cabin AC

Reply #10 –
Your pump should pull down deeper than that. The longer the better.
91 GV U300 Unihome 40' Build 3811
6V92TA Detroit

Re: Cabin AC

Reply #11 –
Well, I got a Vacuum pulled on it--does anyone have any Idea how much freon my coach should hold?
I have gauges but just wandering how much I need to buy!
Thanks
Chris
1999 U 320 DGFE
Build Number 5523
Chris & Elka Lang
In the field, Lonoke AR

Re: Cabin AC

Reply #12 –
Five pounds was what I have seen posted
"Riding and rejoicing"
Bob
1997 U320 40' Mid entry, build 5132,  wtbi ce27, 4th owner
2007 Solara convertible
2 prodeco tech outlaw ss electric bikes

1095 watts solar
08 Ls 460 and a sc430
2000 Ford F-250 superduty 4x4

Re: Cabin AC

Reply #13 –
Quote from: Chris m lang –
Well, I got a Vacuum pulled on it--does anyone have any Idea how much freon my coach should hold?
I have gauges but just wandering how much I need to buy!
Thanks
Chris
I added until the thermometer I put in the register read 40 deg. Ignored quantity and pressure. It still reads 40 deg. with fan on high after running for awhile.
1999 40 ft. U-320 wtfe build 5563 Chuck & Lynda's "Rollin' Inn"  2030 watts solar
prev. mh's 71 GMC 5 yrs. 73 Pace Setter 1 yr. 78 Vogue 5 yrs 81 FTX 40ft all electric 18 yrs. 1996 Monaco Signature 3 yrs.
2014 Grand Cherokee Overland
Dream as if you will live forever. Live as if you will die today.  James Dean

Re: Cabin AC

Reply #14 –
Quote from: Chris m lang –
How long should I pull a vacuum on this large of a system?  On a car I usually pull vacuum for about 1 hour but this system has a lot more volume. My vacuum pump will pull around 22 to 23 In Hg.
Thanks
Chris


How long you run the pump will not indicate complete evacuation. I ran into questions about evacuating systems many times when I owned a commercial refrigeration company. The customer would accuse me of running up the bill by taking to long to "pull a vacuum".

First, the object here is not to pull a vacuum; it is to evacuate the system, which is different. Evacuation is removing the molecules of air  AND ANYTHING ELSE that is in the system down to recommended levels, usually 300 microns or below.  You need a micron gauge to read how many microns are left in the system.  A small, tight, properly purged (with dry nitrogen) system may evacuate in 15 minutes; a larger, heavily contaminated system may take hours or days.

The most prevalent contaminant in AC systems is water. When  system is opened, it very quickly assumes the moisture content of the atmosphere around it (relative humidity). This happens fast and is slow to remedy. Think how fast a sponge soaks up water and how slow it is to dry. There are other factors but I am merely providing an overview.  When you lower the pressure in a system via a vacuum pump, you make the water in the system boil away. Once all the water and/or other contaminant molecules are gone, the micron level drops and your system is ready to recharge.

There are a lot of other factors involved but, again, this is just a over view. Hopefully it is helpful.

TOM 
SOB (Some Other Brand) division
1995 Wanderlodge WB40
8V92 :D