Go Back   iRV2 Forums > THE OWNER'S CORNER FORUMS > Alpine Coach Owner's Forum
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Thread Tools Search this Thread Display Modes
Old 08-19-2010, 12:57 PM   #1
Jackduncan's Avatar
Join Date: Jun 2010
Location: Orlando, FL.
Posts: 41
A/C Unit

Can any one tell me if the A/C units on top of the alpine can be charged. I have one that is not blowing as cold as the back unit. I was told that the A/C works better when the coach is plug in ver running off the gen. is this true.

Jack & Brenda
2004 Alpine 40'
Jackduncan is offline   Reply With Quote
Join the #1 RV Forum Today - It's Totally Free!

iRV2.com RV Community - Are you about to start a new improvement on your RV or need some help with some maintenance? Do you need advice on what products to buy? Or maybe you can give others some advice? No matter where you fit in you'll find that iRV2 is a great community to join. Best of all it's totally FREE!

You are currently viewing our boards as a guest so you have limited access to our community. Please take the time to register and you will gain a lot of great new features including; the ability to participate in discussions, network with other RV owners, see fewer ads, upload photographs, create an RV blog, send private messages and so much, much more!

Old 08-19-2010, 01:17 PM   #2
Community Administrator
Clifftall's Avatar

Fleetwood Owners Club
Ford Super Duty Owner
Join Date: Aug 2009
Posts: 24,509
Originally Posted by Jackduncan View Post
Can any one tell me if the A/C units on top of the alpine can be charged. I have one that is not blowing as cold as the back unit. I was told that the A/C works better when the coach is plug in ver running off the gen. is this true.
Can't answer, however a dirty filter or coil fins will produce your symptoms.


Cliff,Tallulah and Buddy ( 1999-2012 )
Clifftall is offline   Reply With Quote
Old 08-19-2010, 02:53 PM   #3
Senior Member
Jim A's Avatar
Join Date: Jun 2005
Posts: 1,270
I can't see any reason for the AC to work better plugged in to shore power versus the gen. I have used it both ways and never noticed any difference.

What I would suggest is looking at the connection point between the air conditioner and the ducting through the coach. Many have leaks in this area, and some of the cool air just recirculates right back into the AC instead of coming out the duct. Aluminum tape will fix this condition. It made a big difference in mine, and I also have an '04 like you. You might find the old thread in a search. The thread was 5-6 years ago, in the Alpine Coach section.
Jim A
'04 Alpine Coach 36' MDDS
Jim A is offline   Reply With Quote
Old 08-19-2010, 04:18 PM   #4
Senior Member
bcbowers's Avatar
Alpine Owners Club
Join Date: Mar 2009
Location: Surprise, AZ
Posts: 569
I'm going to ask a stupid question only because you're a new owner as I still am and discovered after purchasing the coach that the top cover on the front air conditioning was missing thus preventing it from circulating air. In fact, the front air conditioning cover has been my #1 nemesis since it flew off on our 1st trip and then started coming off on our 2nd trip.

If you happen to be missing the top cover, you need to contact me about the "REASONS" why the cover may have come off and will likely do so again unless specific counter measures are implemented.

Hopefully, the top cover is NOT your problem!
Bob Bowers (Surprise, AZ)
2003 Alpine Coach 40' FDTS
2014 Jeep Cherokee Lattitude
bcbowers is offline   Reply With Quote
Old 08-19-2010, 06:17 PM   #5
Senior Member
Join Date: Aug 2004
Posts: 412
Jack - It will not make any difference where the power source comes from...gen or ground. Also, I ask this only because it is easy to overlook, do you have the front A/C in cool mode rather than fan? The temp settings could be different for front and rear. To answer your refilling question, yes the A/Cs can be recharged but it is not economical to do so. They are a sealed unit and cost to recharge is much more expensive than a car A/C because they actually have to brake into the sealed freon lines and seal them up again. And this doesn't even address what might need to be replaced (the cause of the leak).
'01 Alpine 36 FDDS
SteveS is offline   Reply With Quote
Old 08-19-2010, 07:24 PM   #6
Senior Member
Damon Owners Club
Workhorse Chassis Owner
Join Date: Mar 2009
Posts: 21,176
Though any Air Conditioner can be re-charged, due to modern EPA rules and restrictions it takes a professional technician to do it.. And.. Since they are a sealed system it will need to be done over and a over and a over again and the cost will surly be a drag.
(Take off on a song there)

HOWEVER, as others have pointed out.. I climbed up on the roof (Yet another song) the other day and removed the cover from the A/C.. Found an amazing layer of "Crud" on the condenser fins.. Hosed it off. and man did those puppies work better.
Home is where I park it!
wa8yxm is offline   Reply With Quote
Old 08-24-2010, 10:53 AM   #7
Senior Member
Join Date: May 2004
Location: Auburn, CA, Havasu, AZ & Mulege, BCS
Posts: 5,172
Front AC may have a degraded start capacitor; compressor motor will cycle a lot if this is true and won't get up to speed.

If it is blowing somewhat cold air, probably OK on the capacitor, but hot coils need cleaning and/or the plastic shroud needs new foam to seal it to the coils. The shroud is the upper side of the hot coil air path box, and the cheapo OEM foam seal us usually not properly seating to some extent. Yours may have come unglued totally and be spinning hot air around the coils on the roof rather than running air thru the coils and out the side per the design. I fixed my rear AC w/good strip foam from Lowes and dropped the air temp coming from the unit by 5 degrees or so right off. Did the front a while ago but its been so cool I haven't had a chance for a test.
The discussion about sealing hot vs. cold is good advice also; could be old sealing tape has come undone over the years.
Baja-tested '08 2-slide 36'
Alpine: The Ultimate DIY'er Project
EngineerMike is offline   Reply With Quote
Old 08-26-2010, 10:22 PM   #8
Senior Member
Alpine Owners Club
Join Date: May 2008
Location: Vancouver, WA
Posts: 2,209
WRV sucked when they sealed the incoming cold air from being re-circulated back into the warm air return, since they share a common wall in the unit. I put lots of new foam around the inside of the unit under the cover and this improved my "Delta T Split" temps a lot, almost got it where it should be about 20 degrees apart. However, the best cold air you will get will be in the area of about 20 degrees colder than the outside temp, so if it's 100 you will only get about 80 out of it.

Now, if you can monitor the incoming voltage of your a/c, it should never drop below 108 for the a/c's to work properly, they will run, but it might stress them to try to start with that low of voltage. I would guess if the incoming voltage is that low, you are only getting 12-14 amps per leg on a 50amp circuit. That is bad in my opinion, I would switch over to the genset, and I have done so when the power is that bad. Low voltage causes electrical devices to heat up more, and that causes early failure.

You can have what is called a "Service Port" added to an a/c unit, but it's expensive, only a certified a/c technician should do it, and he should use the solder on type, not the bolt on type. The solder on type (yeah really solder) on type goes over the outside of the line, is soldered on, then an inner screw punches into the line and allows the gauge set to be connected without losing any additional coolant. However, if it's not under factory warranty it's going to cost more in the long run than a new unit is, so just get a direct replacement for the one which is bad, if the old one needs coolant. The data plate of the a/c will have how much to add, how much oil to add, the proper type of coolant to add, etc. My guess is you won't be able to get the coolant if it's older than 5 or so years. EPA rules are horrendous concerning this type of stuff and it's also very expensive if it's real old.

The ducting fixes are most likely what is going on here so if you’re handy you can add some foam in places where it’s leaking and that should take care of the problem. Watch those fan blades if you check it without the cover and its running, you don’t want to lose a finger.
Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech
Old Rv'er is offline   Reply With Quote
Old 08-27-2012, 04:10 PM   #9
Senior Member
Rick J Fisher's Avatar
Alpine Owners Club
Join Date: May 2008
Location: Chatsworth CA
Posts: 160
I too have lost the front A/C shroud but my problem is finding a replacement. The old one is held on with only four screws and has no vents. I got the part number but all the replacements (including Eldon's) look different. IMHO a missing shroud makes little difference in the cooling because only the condenser is outside. The evaporator is inside and the air does not mix. I have been missing that shroud for a year or more and it cools fine. This is good because the rear unit will not operate at all. It has AC voltage. I suspect the thermostat but have no way of checking it. I also suspect the thermostat is mis-wired because in heat mode it checks zone 1 (front) temperature. Usually the heat mode uses zone 2 (back) so you can close off and heat only the bedroom.
Rick J Fisher, BW is Judy
2007 Alpine 34FDDS Limited SE
2003 Jeep Rubicon or a 1995 Toyota Tacoma
Rick J Fisher is offline   Reply With Quote
Old 08-27-2012, 06:35 PM   #10
Senior Member
Algoma's Avatar

Join Date: Nov 2007
Location: Charleston, WV
Posts: 2,166
If you have a missing shroud and it rains you will get a very wet ceiling in your coach.
The default for the furnace is Zone 1 not Zone 2.
John and Mary Knight
2015 Ventana 4311, 2015 Cadillac SRX
Algoma is offline   Reply With Quote
Old 08-27-2012, 06:40 PM   #11
Community Moderator
bdickson's Avatar

Thor Owners Club
Ford Super Duty Owner
Join Date: Apr 2012
Location: Wherever the rig is parked
Posts: 6,646
Originally Posted by Algoma View Post
If you have a missing shroud and it rains you will get a very wet ceiling in your coach.
The default for the furnace is Zone 1 not Zone 2.
The shroud does not keep rain out. It is just a cosmetic cover to improve the appearance and to keep leaves, birds etc out of the roof unit.
Bruce Dickson 2013 Thor Challenger 37GT, 5 Star Tune, Safe-T-Plus Steering Control with Air Trim, Roadmaster front and rear Sway Bars, SuperSteer rear Track Bar, Crossfires, 2012 Honda CRV on Blue Ox Aventa LX tow bar. Full timers since Jan 2012.
bdickson is offline   Reply With Quote
Old 08-27-2012, 07:50 PM   #12
Senior Member
Alpine Owners Club
Join Date: May 2008
Location: Vancouver, WA
Posts: 2,209
You should be able to get the shroud easily. Send me the model and serial number and manfacturer, I can find it I think. I can get one for a 12 year old unit, yours should be a piece of cake, count on 100 dollars as the starting price, the 12 YO one is 97 from the manfacturer. The back one might need new start/run capacitors, those can be checked by any knowledabble A/C person. He will know to discharge them first.

Take a picture of the Thermostat, so I can tell which one you got. Then I can tell you what to do to make it work if he caps are good. Basically, the mode switch needs to display cool or heat, then you choose which zone, 2 is the rear of the coach, zone 1 is forward area (kitchen, LR, etc). The rear a/c takes about 1 minute longer to start then the front one if both have been selected (both zones for cool). If that still does not get it. There are some dip switches in the rear A/C which may be set wrong, the owners manual should have that diagram. Send me PM if you need more assistance.

Monty & Janet - 2007 Alpine APEX 40 MDTS
S/N - 75715 - Retired - Master Certified RV Tech
Old Rv'er is offline   Reply With Quote

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Faulty Fuel Sending Unit mountainaire Spartan Motorhome Chassis Forum 11 08-30-2014 04:18 PM
Rear A/C & Heat Pump unit - Onan Coolent Leak Old Rv'er Alpine Coach Owner's Forum 14 02-17-2009 07:40 PM
A Rather Odd A/C Problem ( a bit long) gasbag MH-General Discussions & Problems 7 10-16-2007 10:10 AM
Our entire AC unit was changed out! Story and pictures. John_Canfield Winnebago Industries Owner's Forum 17 09-13-2007 04:33 PM
Replacing Duo-Therm AC unit Froadin RV Systems & Appliances 9 06-06-2007 11:16 AM

» Virginia Campgrounds

Reviews provided by

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:30 PM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2016, vBulletin Solutions, Inc.