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07-31-2019, 12:22 PM
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#1
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Member
Join Date: Jul 2015
Posts: 98
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Dash air in 90 Deg heat.
Just wondering if I am expecting too much but my RV dash A/C is not cold. I know it is 90 Deg. outside and it is a huge area/volume to cool but even holding my hand up to the vent it feels warm. Stuck a meat thermometer in the vent and it says 70 to 75, deg at best.
But on my Jeep it is blowing 40 Deg and colder, same in my truck. So I have an appointment with the A/C mechanic. But just wondering what other have to say on this issue with dash A/C temperature.
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2006 35 Foot HR Admiral Chevy 8.1 Gas, Bought it 2015 and pretty much rebuilt or replaced most of it inside and out. Although you are never done when you own a RV.
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07-31-2019, 02:22 PM
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#2
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Senior Member
Winnebago Owners Club Freightliner Owners Club
Join Date: Sep 2012
Location: CO
Posts: 930
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Sounds like you may be living up to your nickname, Hotdog2!
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Colorado '15 Winnebago Forza 34T w/MKZ hybrid toad '20 Jeep Cherokee Trailhawk toad
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07-31-2019, 02:32 PM
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#3
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Senior Member
Join Date: Sep 2018
Posts: 355
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40 degree delta between outside ambient and inside vent air is great for a motor home system using r-134. You can get a little better with the newer automobiles but they don’t have 30 to 40 feet of hose between the compressor and the cooling unit. Make sure you have the AC set on Max or Recirc to keep from sucking in the outside hot air.
No guessing about what the problem is. Have a knowledgeable person put some gauges on it to do a proper diagnosis. Throwing a can or two of r-134 at it may or may not make any difference at all.
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Richard Entrekin
99 Newell, Maverick Hybrid Toad
Inverness, Fl
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07-31-2019, 02:33 PM
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#4
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Senior Member
Join Date: Jun 2017
Location: Bryan Tx
Posts: 1,023
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RV is the same as any other automotive type system. If it is blowing 70 deg air there is something wrong, low charge or other system component failure
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“06” Beaver Patriot Thunder , 525 HP C13 Cat
MH 4000 Allison
42 ft Vicksburg, 4 slides
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07-31-2019, 04:22 PM
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#5
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Senior Member
Join Date: Dec 2013
Location: Lake Havasu City, AZ & Plover, WI
Posts: 6,403
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When it's 90* plus, I'll put the dash air on recirculate which helps. If that does not keep us comfortable, the generator starts up and 2-3 roof ACs take over and I will quite often shut the dash unit off. It sounds like you need a recharge of your AC system.
__________________
2006 Monaco Executive 44 Denali
2013 43 QGP Allegro Bus ( SOLD )
2013 Avalanche
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07-31-2019, 04:52 PM
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#6
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Registered User
Monaco Owners Club
Join Date: Mar 2018
Location: Blairsville, GA & WPB, FL
Posts: 3,993
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For $25 you can buy a 134 recharge kit that has a gauge on it. You want 25 to 35 psi on the low side which it can only connect to.
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07-31-2019, 06:42 PM
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#7
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RV Mutant #14
Winnebago Owners Club Texas Boomers Club Freightliner Owners Club iRV2 No Limits Club
Join Date: Aug 2008
Location: Texas
Posts: 17,189
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Take it to a professional and ask for a leak test. They will run dye through. My previous MH had your problem and after several tries a freightliner place diagnoesed it at a leak at two connections. Replaced them and blew cold after that.
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Wayne MSGT USMC (Ret) & Earlene (CinCHouse) RVM14 (ARS: KE5QG)
Lexi - Goldendoodle
2015 Winnebago Tour 42QD - 2020 Lincoln Nautilus Reserve
It is what it is, and then it is what you make of it.
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07-31-2019, 08:44 PM
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#8
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Senior Member
Join Date: Aug 2001
Location: North America somewhere
Posts: 30,655
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Quote:
Originally Posted by Ivylog
For $25 you can buy a 134 recharge kit that has a gauge on it. You want 25 to 35 psi on the low side which it can only connect to.
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I did exactly that in 2013, the dash air has been working great ever since!
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2000 Winnebago Ultimate Freedom USQ40JD , ISC 8.3 Cummins 350, Spartan MM Chassis. USA IN 1SG 11B5MX,Infantry retired;Good Sam Life member,FMCA. " My fellow Americans, ask not what your country can do for you, ask what you can do for your country. John F. Kennedy
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07-31-2019, 09:28 PM
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#9
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Senior Member
Join Date: Sep 2015
Location: Houston, TX
Posts: 305
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To properly charge the ac, you need a set of manifold gauges, and table with the pressures at different ambient temperature..you do t want to over or under charge. Start with measuring the temp going into the evaporator housing (at the recirc flap). Then measure temp at vent. It would be more than 20 degrees difference. Must have good airflow over condenser. If condenser fan does not run, dash air will get hot. If refrigerant is low, dash air will get hot. If recirculation door does not close, dash air will get hot. If it’s low on refrigerant, there must be a leak which needs to be repaired. Good luck.
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08-01-2019, 04:06 PM
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#10
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Member
Join Date: Jul 2015
Posts: 98
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Thank God we found a pretty easy fix to my dash air not cooling. Took it to an A/C mechanic and he hooked it up to his machine. As I understood what he told me, the issue was dirty gas in the system. So he pumped it all out and cleaned the system and then replaced it with new gas with some oil.
Anyway less than two hours after dropping it off it was fixed and no parts needed. So I was a Happy Camper. Now it blows ice cold air much better than it ever has since I owned it. By the way he also advised to never use the 134a canned refrigerant gas. Cool Deal.
__________________
2006 35 Foot HR Admiral Chevy 8.1 Gas, Bought it 2015 and pretty much rebuilt or replaced most of it inside and out. Although you are never done when you own a RV.
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08-01-2019, 04:27 PM
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#11
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Senior Member
Monaco Owners Club
Join Date: Feb 2012
Location: Belle Chasse, La
Posts: 245
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Let us know how it works in 3 or 4 months. I have never heard of dirty gas. Best way to charge a system is to evacuate system and weigh in refrigerant. There should be a tag on the evaporator housing with charge weight.
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Gene @ Alice Ivy 2007 Monaco Dynasty, 2012 Wrangler
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08-01-2019, 06:44 PM
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#12
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Senior Member
Join Date: May 2018
Location: Freeport
Posts: 560
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I am with the above. I have never heard of dirty gas. The r134 is the same stuff that comes out of the big tanks that shops use. I have put numerous A/C units in cars I have built. I take them to a pro for the initial vacuum and charge and then take it from there.
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08-02-2019, 05:44 AM
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#13
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Registered User
Monaco Owners Club
Join Date: Mar 2018
Location: Blairsville, GA & WPB, FL
Posts: 3,993
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Quote:
Originally Posted by hotdog2
the issue was dirty gas in the system. So he pumped it all out and cleaned the system and then replaced it with new gas with some oil.
Anyway less than two hours after dropping it off it was fixed and no parts needed .:
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Dirty gas...no such thing. No parts needed means it was low on Freon. $200 instead of $25 for a 134A recharge kit with a gauge and 10 minutes of your time.
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08-02-2019, 09:01 PM
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#14
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Senior Member
Join Date: Apr 2019
Location: Arisona
Posts: 700
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Ease up brothers. I'm sure the OP meant contaminated refrigerant ...I'm sure you all heard of that?
__________________
2023 GD Imagine XLS 23LDE 2022 Ford F-150
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