RV Trip Planning Discussions

Go Back   iRV2 Forums > MOTORHOME FORUMS > Class A Motorhome Discussions
Click Here to Login
Join iRV2 Today

Mission Statement: Supporting thoughtful exchange of knowledge, values and experience among RV enthusiasts.
Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on iRV2
 
Thread Tools Search this Thread Display Modes
 
Old 09-14-2019, 12:26 PM   #1
Junior Member
 
Join Date: Apr 2019
Posts: 18
Dash air problem

1999 Fleetwood Discovery diesel

Parked the MH a week ago and everything was fine. Started it up and the dash air will not come on. Blower works but compressor clutch is not coming on. Put the gauges on it and system is pressurized with 90 lbs. on both high and low side. When I push the button to turn it on, the light does not turn on. Can't find a pressure switch anywhere in the system. I've checked every fuse I can find on the coach and can't find any blown. Also replaced all 4 relays I found in the battery/fuse compartment. The relays are not labeled, so I don't even know what they are for, but replaced them all for good measure and checked the 4 fuses that are in line with them. I've seen other posts looking for a fuse with similar problems, but no answers. Is there always a pressure switch in the system, or are some built without? I was going to bypass it, but can't find one.
__________________

jim427 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 09-14-2019, 12:39 PM   #2
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 18,492
I can't believe that there is a system built without the pressure switch to protect the A/C compressor .

Do you know what company supplied the dash unit in your coach ?
Evans/Tempcon ?
__________________

__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 09-14-2019, 12:46 PM   #3
Junior Member
 
Join Date: Apr 2019
Posts: 18
I was surprised as well, but if it's there it's hidden very well. I do not know the manufacturer. There is no data sticker anywhere either. I called Freightliner to get the freon capacity and they couldn't tell me. Said it depended on the size of the condenser, either 2.9 or 3.9.
jim427 is offline   Reply With Quote
Old 09-14-2019, 12:48 PM   #4
Senior Member
 
powerboatr's Avatar
 
Damon Owners Club
Freightliner Owners Club
Join Date: Mar 2006
Location: North East Texas
Posts: 4,383
on my f/l chassis, of course dash air is put in by damon, but the pressure switch is over near the dryer, if it helps
there is one installed.


gauges read 90Lbs on low and high with compressor not engaged, really tells little.


you may need to add a can to see if the compressor will kick in and then read gauge pressures based on outside air temp
__________________
USN Retired, Life time member of the DAV.
Enjoying the 2008 Damon Tuscany 4056, no your eyes are fine, there are really 6 slides
2016 Expedition or 2012 Edge toads

powerboatr is offline   Reply With Quote
Old 09-14-2019, 03:03 PM   #5
Junior Member
 
Join Date: Apr 2019
Posts: 18
Still can't find a pressure switch. It's not where you'd expect to find it around the dryer or anywhere else under the nose. I was using the 90 lbs on the low and high side as an indicator that the system was pressurized. But you may be right powerboatr, it might not have enough freon. I'm relatively new at A/C work, so I guess that reading is not a good indicator? Now you've got me thinking about the Schrader valves. I think I'll replace them, draw another vacuum, and recharge.
jim427 is offline   Reply With Quote
Old 09-14-2019, 03:10 PM   #6
DJJ
Senior Member
 
DJJ's Avatar
 
Join Date: May 2013
Location: Key Largo, FL
Posts: 307
How about checking for 12volts at the compressor? It seems to me the first thing would be to determine if your getting voltage to the compressor.
DJJ is online now   Reply With Quote
Old 09-14-2019, 03:50 PM   #7
Junior Member
 
Join Date: Apr 2019
Posts: 18
I'm not seeing 12v at the compressor which is why I was going to bypass the pressure switch. I can't find the pressure switch. But if it's low on freon the pressure switch, wherever it is, would be open, and thus no 12v at the compressor. So the theory of the moment is a gas leak. I'll find some A/C Schrader valves next week and start again.
jim427 is offline   Reply With Quote
Old 09-14-2019, 03:57 PM   #8
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 18,492
The pressure switch , should be in the smaller of the two lines to the expansion block on the heater housing , mine was just next to the receiver/dryer.
Hidden behind a wiring harness of course.
Attached Thumbnails
Click image for larger version

Name:	IMG_0427.JPG
Views:	9
Size:	98.5 KB
ID:	260321  
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 09-14-2019, 04:10 PM   #9
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 18,492
Because , Freightliner supplied the wiring to the engine and the compressor and Fleetwood installed the dash portion and hooked to the Freightliner wiring to power the compressor, and charged the system ; dash A/C troubleshooting is a nightmare.

If your 99 Freightliner chassis is like mine then the , joint between the Fleetwood wiring and the Freightliner wiring , will be close to the drivers side frame rail end , and the pressure switch will be between the A/C housing and the frame rail .
Look for the name on the A/C housing , as in photo below , and I'll see if any of the photos I have show the wiring joint.
Attached Thumbnails
Click image for larger version

Name:	IMG_0462.JPG
Views:	15
Size:	157.3 KB
ID:	260322  
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 09-14-2019, 04:23 PM   #10
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 18,492
Ok, this picture is directly above the gen set , and at the yellow arrow you can see the Freightliner wiring ( white wire to the right ) and the Newmar wiring ( blue coming from the left ) joined with a butt connector.
Because the Freightliner wiring has no allowance for the pressure switch , the PS should be before this joint.
Attached Thumbnails
Click image for larger version

Name:	IMG_0006 (640x480).jpg
Views:	12
Size:	145.9 KB
ID:	260324   Click image for larger version

Name:	Evans wiring schematic (465x640).jpg
Views:	9
Size:	155.0 KB
ID:	260325  

Click image for larger version

Name:	Evans Parts.PNG
Views:	12
Size:	274.5 KB
ID:	260326  
__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Old 09-14-2019, 08:31 PM   #11
Junior Member
 
Join Date: Apr 2019
Posts: 18
Thanks Skip, now at least I have something to go on.
jim427 is offline   Reply With Quote
Old 09-15-2019, 05:03 AM   #12
Junior Member
 
Join Date: Aug 2019
Posts: 20
Quote:
Originally Posted by jim427 View Post
Thanks Skip, now at least I have something to go on.
Itís great that you have hope. Caution with these wires, they are easy to damage.
Tom Cooper is offline   Reply With Quote
Old 09-15-2019, 09:32 AM   #13
Junior Member
 
Join Date: Apr 2019
Posts: 18
This is what I have under the hood from left to right. No Evans box in sight.
Attached Thumbnails
Click image for larger version

Name:	IMG_3043.jpg
Views:	8
Size:	305.6 KB
ID:	260389   Click image for larger version

Name:	IMG_3044.jpg
Views:	10
Size:	340.2 KB
ID:	260390  

Click image for larger version

Name:	IMG_3045.jpg
Views:	10
Size:	368.3 KB
ID:	260391   Click image for larger version

Name:	IMG_3046.jpg
Views:	9
Size:	271.0 KB
ID:	260392  

jim427 is offline   Reply With Quote
Old 09-15-2019, 10:30 AM   #14
Senior Member
 
Skip426's Avatar


 
Join Date: Apr 2011
Location: Powell River, B.C.
Posts: 18,492
I can't see a pressure switch either .

The dash unit may be Fridgidet ( spelling ?) I'l see if I can track down any info.
__________________

__________________
99DSDP 3884, Freightliner, XC, CAT 3126B, 300 HP /ALLISON 3060
2000 Caravan toad, Remco & Blue Ox.
Skip426 is offline   Reply With Quote
Reply

Tags
air, dash, dash air, problem



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
dash air wont shift from defrost outlets to dash outlets drrussell Monaco Owner's Forum 3 08-21-2016 03:30 PM
Dash Air Hose/Dash Instrument Speaker Ken T. Alpine Coach Owner's Forum 6 09-08-2014 10:39 PM
'04 Beaver (Monaco) Dash air problem H. Miller MH-General Discussions & Problems 2 02-07-2009 11:36 PM
Dash Air Flow Problem chasfm11 MH-General Discussions & Problems 9 08-14-2005 03:46 PM
Red Oil Pressure Signal on dash is a GM Problem in Dash Unit BEBOP Workhorse and Chevrolet Chassis Motorhome Forum 11 07-28-2005 06:47 PM

» Featured Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 02:34 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
×