RV Trip Planning Discussions

Go Back   iRV2 Forums > THE CHASSIS CLUB FORUMS > Workhorse and Chevrolet Chassis Motorhome Forum
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 06-16-2018, 08:18 PM   #1
Junior Member
 
Join Date: Jun 2018
Posts: 4
ACME Dash A/C System Questions

I have a 1994 Tiffin Allegro on a Chevrolet P30 chassis, 454 TBI engine. I have owned it a little over a year.

I have driven the rig about 700 miles in the last year. I never turned on the dash a/c when I was driving it.

I have one last bug to work out.

I recently had to replace the power steering pump. I tried to gain access via various directions but gave up and entered through the front, requiring me to take apart and open up the chassis A/C system. The power steering pump is now replaced along with the cooling and chassis A/C system components.

It is an r134a system.

I have pulled a vacuum and it held, so I feel comfortable there are no leaks.

I know it is recommended I replace the dryer. But before I do I want to make sure I can fill r134a freon.

I have tried turning on the dash a/c system but it will not turn on. I'm assuming because it has no freon. I understand that the systems low cut out switch will not allow the compressor to turn on as a self-protective mode. Correct me if I'm wrong.

I'm very much my own mechanic, this situation not excluded.

The document I've attached to this message contains the 1 page set of documents/helps I've been able to obtain from the Tiffin service department. Sad!

Question: How is this issue addressed, i.e. how do I get the compressor to turn on to draw in the freon, without causing damage to the compressor, since the system is empty of freon?



I await your response.
Attached Files
File Type: pdf 1994 Tiffin Allegro acme gas dash ac.PDF (75.3 KB, 17 views)
__________________

rotorwing61 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 06-16-2018, 08:22 PM   #2
Senior Member
 
CJ7365's Avatar
 
Tiffin Owners Club
Join Date: Mar 2015
Location: Southern NM
Posts: 2,181
I have always jumpered the low pressure switch (wiring connector for the low pressure switch), if fact on my Honda civic there is an extra plug just for this.

Some vehicles just by adding the R134 with a vacuum without running the compressor will suck in enough to activate the compressor, if not jumper the low pressure switch


I don't just let the compressor run all the time, I will turn on the A/C for 20 seconds then turn off, do this a couple of times and then remove the jumper.
__________________

__________________
2005 Tiffin Allegro Bay 37DB
W22 Workhorse Chassis 8.1 Flat Towing a 82 Jeep CJ7
CJ7365 is offline   Reply With Quote
Old 06-16-2018, 08:51 PM   #3
Junior Member
 
Join Date: Jun 2018
Posts: 4
Thanks CJ7365!

CJ7365-

Thanks for your prompt response!

The only component of the a/c system in the front/engine bay that has wire(s) leading to it (other than the system Thermostat) is the component similar to the one attached below, with 4 wires. I'm assuming this is the pressure switch you're referring to?

Any idea how to tell which of the 4 wires go to the low side?
Attached Thumbnails
Click image for larger version

Name:	RV dash ac system pressure switch with 4 wires.png
Views:	29
Size:	303.2 KB
ID:	207434  
rotorwing61 is offline   Reply With Quote
Old 06-16-2018, 09:08 PM   #4
Senior Member
 
CJ7365's Avatar
 
Tiffin Owners Club
Join Date: Mar 2015
Location: Southern NM
Posts: 2,181
I have never seen a low pressure or high pressure switch with 4 wires on it.

The PDF schematics show a 2 wire switch.

This is strange to me. Maybe others will chime in.

You have a vacuum on your system right now, you could take a chance and fill what you can and hope that the compressor will start.

Putting the R134a can in a bucket of warm water will help let it flow better.

I really don't know how I would dissect that switch.
__________________
2005 Tiffin Allegro Bay 37DB
W22 Workhorse Chassis 8.1 Flat Towing a 82 Jeep CJ7
CJ7365 is offline   Reply With Quote
Old 06-16-2018, 09:11 PM   #5
Senior Member
 
CJ7365's Avatar
 
Tiffin Owners Club
Join Date: Mar 2015
Location: Southern NM
Posts: 2,181
According to the schematics the wires to the low pressure switch are white and red/yellow.


Do you have these colors?




I just thought of another possible thing you could do, you could unplug the compressor from the wiring harness and apply 12v directly to the compressor.
__________________
2005 Tiffin Allegro Bay 37DB
W22 Workhorse Chassis 8.1 Flat Towing a 82 Jeep CJ7
CJ7365 is offline   Reply With Quote
Old 06-17-2018, 10:02 PM   #6
Junior Member
 
Join Date: Jun 2018
Posts: 4
I will try your suggestions tomorrow and report back.
rotorwing61 is offline   Reply With Quote
Old 06-17-2018, 10:04 PM   #7
Junior Member
 
Join Date: Jun 2018
Posts: 4
CJ7365-

1) Where did you obtain the schematics to my 1994 Tiffin Allegro that you referred to?

2) Could I get a copy of these schematics?
rotorwing61 is offline   Reply With Quote
Old 06-18-2018, 07:38 AM   #8
Senior Member
 
CJ7365's Avatar
 
Tiffin Owners Club
Join Date: Mar 2015
Location: Southern NM
Posts: 2,181
Quote:
Originally Posted by rotorwing61 View Post
CJ7365-

1) Where did you obtain the schematics to my 1994 Tiffin Allegro that you referred to?

2) Could I get a copy of these schematics?
The schematics PDF I looked at are posted in you OP


Red arrow pointing to Low pressure switch



sorry for the small pic, I am having a hard time enlarging it.

Red circles are the 2 wires to and from the switch
white and red/yellow
Attached Thumbnails
Click image for larger version

Name:	Untitled.jpg
Views:	31
Size:	83.6 KB
ID:	207566  
__________________
2005 Tiffin Allegro Bay 37DB
W22 Workhorse Chassis 8.1 Flat Towing a 82 Jeep CJ7
CJ7365 is offline   Reply With Quote
Old 06-22-2018, 09:22 PM   #9
Senior Member
 
Join Date: Aug 2016
Location: Seattle,WA/HB,CA./Fujieda-Japan
Posts: 394
When you get it up and running you'll likely find that it will work very marginally when that hot sun and hot engine is running and your blasting down the highway.

The dash A/C simply is not powerful enough to cool the large volume of space up front...let alone the whole RV.

I've already decided the day it no longer works is the day it will stay non operable.
__________________

__________________
1994 Southwind Storm 28ft 7.4L TBI P-30
60,976 miles and counting...as of 07/12/2019
VIN#1GBJP37N4R3314754
udidwht is offline   Reply With Quote
Reply

Tags
dash



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
ACME EZE Tow Dolly on Order Questions and a Rant Nomad Mike Toads and Motorhome Related Towing 68 10-13-2015 08:53 AM
ACME Dash AC help gatorcruz Class A Motorhome Discussions 15 07-04-2014 10:42 AM
Found a link to several ACME dash air schematics ECM747x Class A Motorhome Discussions 1 09-14-2011 02:40 AM
Acme dash air conditioner Greg from Pittsburgh Alpine Coach Owner's Forum 2 08-05-2009 07:23 AM

» Featured Campgrounds

Reviews provided by


Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -6. The time now is 03:03 PM.


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