Visit our BAC Favorite Places Web Page

Author Topic: Recharging Dash AC  (Read 2182 times)

Jason Worman

  • BAC Member
  • *
  • Posts: 222
  • Thanked: 26 times
Recharging Dash AC
« on: June 11, 2019, 07:49:39 PM »
Hi everybody,

Just a quick question, I was going to recharge the dash air, I am guessing it is the same procedure for charging on regular cars. Anything different I need to know?

Thanks

Jason Worman

2018-
91 Contessa 36 Foot
3116 CAT

Mike Shumack

  • BAC Member
  • *
  • Posts: 1171
  • Thanked: 310 times
  • Orlando, Florida
Re: Recharging Dash AC
« Reply #1 on: June 11, 2019, 08:26:42 PM »
Same as on a car.

Evacuate (and recycle) the refrigerant in the system.
Then pull a vacuum on the system - the longer you can keep the vacuum pump on the better.
Then shut off pump. 
Be sure it holds vacuum (i.e. no leaks), then recharge.
If you flush any components be sure to add the appropriate amount of oil back in.
- Mike

'05 Beaver Patriot Thunder 525, Vicksburg, CAT C13, Allison 4000MH, HydraLift
Orlando, FL
The following users thanked this post: Jason Worman

Steve Huber Co-Admin

  • Administrator Group
  • *
  • Posts: 2273
  • Thanked: 1366 times
Re: Recharging Dash AC
« Reply #2 on: June 11, 2019, 09:18:03 PM »
Jason,
Put no more than a can in. If your charge port is in front, the PSI reading will be lower than for a car because the compressor is ~30' away. Rule of thumb I use is that AC air at vents should be 20 degrees or more cooler than ambient air.
Steve
Steve
2015-          07 Contessa Bayshore C9,  400 hp
2013-2015: 00 Marquis Tourmaline, C12, 425 hp
2005-2013: 01 Contessa Naples, 3126B, 330 hp
The following users thanked this post: Jason Worman

Jason Worman

  • BAC Member
  • *
  • Posts: 222
  • Thanked: 26 times
Re: Recharging Dash AC
« Reply #3 on: June 11, 2019, 09:34:32 PM »
Steve,

Both AC lines are in the front, the smaller line runs to a box in upper right corner, the larger line joins some other hoses and disappears under the coach. Thank you for the advice about one can, was trying to figure out exactly how much to add. Wonder if I should wait to do this later, current outside temperature is 95 degrees, will cool off again in two days. A strange temp spike for here on the Oregon Coast.

Jason
2018-
91 Contessa 36 Foot
3116 CAT

Mike Shumack

  • BAC Member
  • *
  • Posts: 1171
  • Thanked: 310 times
  • Orlando, Florida
Re: Recharging Dash AC
« Reply #4 on: June 12, 2019, 11:10:00 AM »
Hi Jason,
I thought from your first post you were asking about "a complete recharge" - but I see now you are talking about "topping up" the system.

Usually the charging/gauge ports are located at the compressor. Is yours at the front of coach (by the evaporator)?

Good luck
- Mike

'05 Beaver Patriot Thunder 525, Vicksburg, CAT C13, Allison 4000MH, HydraLift
Orlando, FL
The following users thanked this post: Jason Worman

Doug Allman

  • Guest
Re: Recharging Dash AC
« Reply #5 on: June 12, 2019, 01:54:40 PM »
Jason, Going a long way back when I had the 1991 Contessa with 3116 but if I remember correctly the charge ports were in the back. We did have to replace the entire two lines from front to back but if memory serves me correctly the ports were in the back. The dryer was up in the front cap. We did that change out in 1997 so I could be incorrect on port location.
On our 2004 Marquis the charge port was in middle front of coach up above the generator in a miserable location to get to and connect hoses onto. Dryer up above the drivers wiper motor and another miserable location to get to.
The following users thanked this post: Jason Worman

Jason Worman

  • BAC Member
  • *
  • Posts: 222
  • Thanked: 26 times
Re: Recharging Dash AC
« Reply #6 on: June 12, 2019, 06:57:56 PM »
Doug,

I opened the front cap panel and red capped line is connected to the evaporator, the blue capped line runs to a box in up eight hand corner. The blue capped line has sensor connected to it. I am wondering if this is something else? I could not find any connectors in the back. I am not sure when the conversion to 134a system took place. I will check out my schematics just to make sure. I an guessing it will be listed somewhere....

Jason
2018-
91 Contessa 36 Foot
3116 CAT

Jason Worman

  • BAC Member
  • *
  • Posts: 222
  • Thanked: 26 times
Re: Recharging Dash AC
« Reply #7 on: June 13, 2019, 12:24:24 AM »
Thank you everybody, got the system charged to 35 psi, blowing cold, seems to be holding pressure, will re-check in a few days and see where things stand.
2018-
91 Contessa 36 Foot
3116 CAT

Dwight Lakusta

  • BAC Member
  • *
  • Posts: 89
  • Thanked: 10 times
  • 2003 Marquis Ruby, C-12, 505HP
Re: Recharging Dash AC
« Reply #8 on: July 21, 2019, 06:24:03 AM »
Where did the port end up being? On my marquis I can’t seem to find the fitting to top up my system..... anywhere? There is one on the bottom, but it’s too large to connect to!
2003 Beaver Marquis Ruby 40, 3 slides, C12, 505HP. Current unit.
2008 Newmar Dutch Star, 40, 4 slides, 8.9 ISL, 400HP.
2000 Monaco Windsor, 40, 2 slide, 8.3 ISC, 330HP.

Steve Huber Co-Admin

  • Administrator Group
  • *
  • Posts: 2273
  • Thanked: 1366 times
Re: Recharging Dash AC
« Reply #9 on: July 21, 2019, 07:03:31 AM »
Dwight,
Maybe an 03 owner has the specific answer but they should be behind the front cap. Some coaches had them added to the lines coming from the compressor in the engine compartment also.
Steve
Steve
2015-          07 Contessa Bayshore C9,  400 hp
2013-2015: 00 Marquis Tourmaline, C12, 425 hp
2005-2013: 01 Contessa Naples, 3126B, 330 hp

Eric Maclean

  • BAC Member
  • *
  • Posts: 34
  • Thanked: 15 times
Re: Recharging Dash AC
« Reply #10 on: July 21, 2019, 12:55:19 PM »
Jason
Rule of thumb if you can locate the receiver dryer checK to see if it has a sight glass on the top many do if so add refrigerant until the bubbles stop moving through the sight glass (ie the glass is clear) add half a pound more and you are done.
1997 Patriot Yorktown
3126-B

Dwight Lakusta

  • BAC Member
  • *
  • Posts: 89
  • Thanked: 10 times
  • 2003 Marquis Ruby, C-12, 505HP
Re: Recharging Dash AC
« Reply #11 on: July 22, 2019, 01:56:40 AM »
I’m going to have a peek at it again this weekend coming up. Might slide out the genny and get way up in there.
2003 Beaver Marquis Ruby 40, 3 slides, C12, 505HP. Current unit.
2008 Newmar Dutch Star, 40, 4 slides, 8.9 ISL, 400HP.
2000 Monaco Windsor, 40, 2 slide, 8.3 ISC, 330HP.