Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
 


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 09-12-2014, 11:52 AM   #1
Rivet Loser
 
Punch's Avatar
 
La Ronge , Saskatchewan
Join Date: Nov 2011
Posts: 328
HVAC problems

I have a 1994 Land Yacht Legacy 34. At the beginning of a day's drive, the heater and AC seem to work just fine. As the miles and the day wsears on, and especially if we're doing multi day trips, the amount of air coming out gets less and less, down to zero/zilch/nada, I can still hear the fan blowing though. This seems to be a distribution problem, because there is both cool AC air and hot air at the start of any day.

I should emphasize that I am talking about the dash air and heat.
Punch is offline   Reply With Quote
Old 09-12-2014, 12:04 PM   #2
Rivet Master
Airstream Dealer
 
Inland RV Center, In's Avatar
 
Corona , California
Join Date: Feb 2002
Posts: 16,497
Images: 1
Quote:
Originally Posted by Punch View Post
I have a 1994 Land Yacht Legacy 34. At the beginning of a day's drive, the heater and AC seem to work just fine. As the miles and the day wsears on, and especially if we're doing multi day trips, the amount of air coming out gets less and less, down to zero/zilch/nada, I can still hear the fan blowing though. This seems to be a distribution problem, because there is both cool AC air and hot air at the start of any day.

I should emphasize that I am talking about the dash air and heat.
Your describing a freeze up situation.

As you dash air keeps working, it's slowly building up some ice that gets in the way of the air.

The usual problem is a dirty air filter, as not enough air is crossing the cooling coils.


Andy
__________________
Andy Rogozinski
Inland RV Center
Corona, CA
Inland RV Center, In is offline   Reply With Quote
Old 09-12-2014, 12:35 PM   #3
Moderator
 
DKB_SATX's Avatar

 
2017 26' Flying Cloud
Alamo Heights , Texas
Join Date: Aug 2006
Posts: 8,500
Images: 1
Blog Entries: 7
Another problem that can cause the evaporator coil to freeze up on longer trips is low refrigerant levels.
__________________
— David

Zero Gravitas — 2017 Flying Cloud 26U | WBCCI# 15566

He has all of the virtues I dislike and none of the vices I admire. — Sir Winston Churchill
DKB_SATX is offline   Reply With Quote
Old 09-12-2014, 12:59 PM   #4
Rivet Loser
 
Punch's Avatar
 
La Ronge , Saskatchewan
Join Date: Nov 2011
Posts: 328
Thanks both. But this occurs if the AC is off and I'm just on heat too. Woould I still get freeze up?

Andy...... air filter? What air filter?
Punch is offline   Reply With Quote
Old 09-12-2014, 02:03 PM   #5
Moderator
 
DKB_SATX's Avatar

 
2017 26' Flying Cloud
Alamo Heights , Texas
Join Date: Aug 2006
Posts: 8,500
Images: 1
Blog Entries: 7
So, you don't get air output from ANY vents (floor, dash, windshield) when this is happening, but you're sure the fan is still turning at normal speeds? Depending on how the distribution is controlled, it might be a servo problem but I'd expect the air to always go SOMEWHERE, the distribution controls should affect where, but not be able to turn it off (in most automotive systems... I've no experience with the moho system specifically.)
__________________
— David

Zero Gravitas — 2017 Flying Cloud 26U | WBCCI# 15566

He has all of the virtues I dislike and none of the vices I admire. — Sir Winston Churchill
DKB_SATX is offline   Reply With Quote
Old 09-12-2014, 02:05 PM   #6
Rivet Master
 
1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
Join Date: Jul 2009
Posts: 4,591
Quote:
Originally Posted by Punch View Post
Thanks both. But this occurs if the AC is off and I'm just on heat too. Woould I still get freeze up?

Andy...... air filter? What air filter?
Yes, because the air first goes through the cooling part of the system to dehumidify it, then to the heater section to warm it up so it is warm and dry. So, freeze up can happen even when using heat.
idroba is offline   Reply With Quote
Old 09-12-2014, 05:11 PM   #7
Rivet Loser
 
Punch's Avatar
 
La Ronge , Saskatchewan
Join Date: Nov 2011
Posts: 328
Thanks David and idroba.... I can still hear the fan blowing away, but I don't get air coming out, at least not to feet and face, although I'm not sure about windshield. At first, at the beginning of a run, all is normal, but then after a while, maybe an hour or two, I have to move the control to Max in order to get flow, then that slows and eventually all air flow seems to stop, but I can still hear the fan blowing somewhere just as strongly.

Thaks for the clarification, idroba. I guess I need to find where the air filter is.... under hood or in front of passenger seat maybe?
=====
Edit: this thread
http://forums.trailerlife.com/Index....d/25390449.cfm
..... seems to indicate that the consensus is there is no such thing as a dash air filter?
=====

My initial thought was whether I had some kind of progressive vacuum leak that for some reason got worse over time, but then disappeared by a new day, something heating up then leaking? I have no idea what I'm talking aboput though.
Punch is offline   Reply With Quote
Old 09-12-2014, 05:24 PM   #8
Rivet Master
 
1974 Argosy 20
2014 20' Flying Cloud
Kooskia , Idaho
Join Date: Jul 2009
Posts: 4,591
I am pretty sure your coils are freezing up. When it happens again, try turning the system off for a while (maybe half hour) and then re starting it. If it now blows air, what has happened is that the coils unfroze and air flow is resumed.

You probably will need service. The possibilities are low refrigerant or a defective pressure control which does not shut the compressor down at the right temperature. There are no air filters in the old system you have which would cause the problem.

Most AC repair shops will understand what is going on if you explain it to them, and will be able to find the issue. It is pretty common. Even my 2012 Jeep Grand Cherokee has the issue now and then, and I need to have the thing repaired under warrantee.
idroba is offline   Reply With Quote
Old 09-12-2014, 05:39 PM   #9
Rivet Loser
 
Punch's Avatar
 
La Ronge , Saskatchewan
Join Date: Nov 2011
Posts: 328
Thanks idroba, I shall take it to a different shop than the last one, since they couldn't find why my heater wasn't working, and I then found it was because the cable had disconnected at the dash control end! The trouble is finding someone competent and honest.
Punch is offline   Reply With Quote
Old 09-14-2014, 05:31 PM   #10
3 Rivet Member
 
2000 31' Excella
Ontario , Canada
Join Date: Feb 2010
Posts: 215
Smile You have to appreciate this guy!

Quote:
Originally Posted by Inland RV Center, In View Post
Your describing a freeze up situation.

As you dash air keeps working, it's slowly building up some ice that gets in the way of the air.

The usual problem is a dirty air filter, as not enough air is crossing the cooling coils.


Andy
Hi Andy. It is so good to see your input on the Airstream Forums. I have owned 3 a/s trailers and now a LY 30 M/H. Your inut has always been most valuble and appreciated over the last 15 years. Thank you and keep the info coming.
Woodytwo
woodytwo is offline   Reply With Quote
Old 09-21-2014, 09:22 PM   #11
Rivet Master
 
Vycan's Avatar
 
1994 36' Classic 36 Diesel
Colorado Springs , Colorado
Join Date: Mar 2012
Posts: 883
Blog Entries: 1
Had a similar problem in my classic, and affected both heating and cooling. It turned out to be a bad grounding cable for the dash fan. Specifically, the gauge wire was too small for the ground, it would get very hot, and over time the thermal buildup would kill the voltage to the motor and therefore the airflow, but the fan still sounded like it was running. Recommend checking your grounding wire. If it is an 18-14 gauge wire, recommend changing to an eight to ten gauge.
__________________
1994 36' Classic Diesel Pusher
Vycan is offline   Reply With Quote
Reply


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
HVAC thermostat opinions please! AtomicNo13 Electrical - Systems, Generators, Batteries & Solar 8 07-10-2012 04:08 PM
HVAC Experts-Please Help tesstoaster Furnaces, Heaters, Fireplaces & Air Conditioning 1 07-03-2012 07:50 PM
Help an HVAC noobie out... can I combine the furnace and A/C t-stat? Taylormade Furnaces, Heaters, Fireplaces & Air Conditioning 10 05-16-2012 02:13 PM
Generator--HVAC Question Tideair Generators & Solar Power 10 03-14-2012 09:24 PM
Airstream - Free Standing HVAC anglev Winter Living 8 12-04-2011 07:20 AM


Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.



All times are GMT -6. The time now is 12:31 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.