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Topic: Dash AC issues (Read 1901 times) previous topic - next topic

Re: Dash AC issues

Reply #25 –
The AC system on my Coach holds 80 oz or five pounds of 134a Freon I weigh it.
Rick & Hilda looking forward to full- timing one day for now couple of months at a time
1999 U270 3602
Built number  5530.  Feb 1999            Motorcade  number 18438
8.3 Cummins Allison six speed with brake  retarder
Purchased Nov 28 2019

Re: Dash AC issues

Reply #27 –
My dash a/c was functioning but not very well in this triple digit heat index.

I changed the drier and expansion valve and did some repairs to the lower section of the evaporator box on the firewall.  The plastic bottom of the case holding the drain tube and the vacuum generator for the fresh air door had been broken from age and was not holding them in place.  I was able to put them back on with some thick sticky insulating tape wrap and now it works just fine. Saved about $800 just for a new evap box!  Cleaned the condenser and oiled the fans. 

After vacuum and recharge, the end result is about 20 degrees cooler than ambient ( not 40 degrees like I like it!) out the vents and the recirculate function on the blend doors working as it should. I still need to change the compressor belts and maybe a new condenser in the future.

Jerry
The selected media item is not currently available.
Jerry and Cindy Maddux
1993 U300/36WTBI DD6v92TA
build 4271  "Miss Lou"
1995 suzuki sidekick 4x4 toad
Gulfport, Ms

"Pride of Ownership"

Re: Dash AC issues

Reply #28 –
I added 5 lb of refrigerant and while I'm not completely sure of the readings I was getting 40° blowing out of the duct with outside temperatures north of 80 I believe it was at the time.
I bought a new dryer and expansion valve, but haven't installed it yet.
Didn't know if the boondockers welcome host would appreciate me doing work on the coach in her yard but she was okay with putting refrigerant in. We'll see what time shows but I'm pretty sure I'm going to have to replace the dryer and maybe the expansion valve.
I did the work on June 30th so really only a month and a half has gone by and everything still blowing cold. I may have to put another pound of refrigerant in but maybe not.
'99 U320 40 WTFE
Build #5462,
1500 Watts Solar 600 amp Victron lithium
2012 Jeep Grand Cherokee Overland Hemi
Instagram bobfnbw
Retired

Re: Dash AC issues

Reply #29 –
Quote from: Journey, Roam, Explore –
I added 5 lb of refrigerant and while I'm not completely sure of the readings I was getting 40° blowing out of the duct with outside temperatures north of 80 I believe it was at the time.
I bought a new dryer and expansion valve, but haven't installed it yet.
Didn't know if the boondockers welcome host would appreciate me doing work on the coach in her yard but she was okay with putting refrigerant in. We'll see what time shows but I'm pretty sure I'm going to have to replace the dryer and maybe the expansion valve.
I did the work on June 30th so really only a month and a half has gone by and everything still blowing cold. I may have to put another pound of refrigerant in but maybe not.


What did the gauges look like while the system was running? Also a 40° drop is really good. That's what I used to target when I did A/C work. 30° drop was acceptable, but 40° was great.
1991 U300 Side Aisle 6V92 Silver #3897
2004 U320 40' #6246

Re: Dash AC issues

Reply #30 –
I think the picture that I posted was with the engine running and the AC running. Right after I put the refrigerant in. I thought the readings were a little bit low for what I thought I should be but I was happy with the results so. I used all 5 lb of refrigerant didn't buy any more than that. I'm just going to top it off with a can every once in awhile until I can really rebuild the system properly.
'99 U320 40 WTFE
Build #5462,
1500 Watts Solar 600 amp Victron lithium
2012 Jeep Grand Cherokee Overland Hemi
Instagram bobfnbw
Retired

Re: Dash AC issues

Reply #31 –
The numbers from your picture would be with the compressor off. 100 high 100 low. It should be around 30-35 low and 200-250 high.
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: Dash AC issues

Reply #32 –
Quote from: coastprt –
My dash a/c was functioning but not very well in this triple digit heat index.

I changed the drier and expansion valve and did some repairs to the lower section of the evaporator box on the firewall.  The plastic bottom of the case holding the drain tube and the vacuum generator for the fresh air door had been broken from age and was not holding them in place.  I was able to put them back on with some thick sticky insulating tape wrap and now it works just fine. Saved about $800 just for a new evap box!  Cleaned the condenser and oiled the fans. 

After vacuum and recharge, the end result is about 20 degrees cooler than ambient ( not 40 degrees like I like it!) out the vents and the recirculate function on the blend doors working as it should. I still need to change the compressor belts and maybe a new condenser in the future.

Jerry
Jerry...source and part numbers please  for the drier and expansion valve
thx
H
Hans & Marjet
1995 U300 "Ben" (#4719)
3176B Cat,4060HD,Jake
SKP#139131
Motorcade#17579
2006 Honda Element (towed)

Re: Dash AC issues

Reply #33 –
Quote from: Hans&Marjet –
Jerry...source and part numbers please  for the drier and expansion valve
thx
H
Sorry Hans, my goof.
Both parts I ordered online from NAPA.
The a/c expansion valve is part No. TEM 207376 for $29.10  https://www.napaonline.com/en/search?text=TEM%20207376&referer=v2
The a/c receiver filter drier - H/D truck is part No.  TWD ME17159 for $40.99  https://www.napaonline.com/en/p/TWDMEI7159
I bought the insulating tape for $30 at O'reileys for a big roll and had plenty left over for other projects.

Jerry
The selected media item is not currently available.
Jerry and Cindy Maddux
1993 U300/36WTBI DD6v92TA
build 4271  "Miss Lou"
1995 suzuki sidekick 4x4 toad
Gulfport, Ms

"Pride of Ownership"
 

Re: Dash AC issues

Reply #34 –

I'm getting ready to charge my dash AC.  It had the AC compressor replaced by the RV dealer where I bought the coach four years ago and the dash air worked OK but slowly lost it's charge over that time.  I bought some UV dye and intend to inject that along with the new refrigerant in order to help locate the leak.  This product recommends 1/4 oz. for a typical vehicle and has four doses in the bottle (1 oz. total).  Given the length of the refrigerant lines it seems like I should use more?  Maybe two doses?  Anyone have any experience with this or at least an informed opinion?

thanks

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George Mann
2002 U320 #5934
2017 Rubicon
2013 BMW GS
Waterford MI