GMCforum
For enthusiast of the Classic GMC Motorhome built from 1973 to 1978. A web-based mirror of the GMCnet mailing list.
Home » Public Forums » GMCnet » Install Duracool/Fan Speed
Install Duracool/Fan Speed [message #221140] Wed, 04 September 2013 14:38 Go to next message
Manong is currently offline  Manong   United States
Messages: 88
Registered: July 2007
Location: Madison, WI
Karma: 0
Member
No Message Body

Manong
Madison, WI

[Updated on: Fri, 23 May 2014 16:10]

Report message to a moderator

Re: Install Duracool/Fan Speed [message #221141 is a reply to message #221140] Wed, 04 September 2013 14:44 Go to previous messageGo to next message
tphipps is currently offline  tphipps   United States
Messages: 3005
Registered: August 2004
Location: Spanish Fort, AL
Karma: 9
Senior Member
High fan speed is directly from the alternator output, tapped at the center post on the isolator. Engine must be running, as I recollect.
Look for voltage or connectivity from center post on the isolator to the high speed fan position and fron high speed fan position to the fan. Clean the connectors while you are there.
Let us know.
Tom, MS II

2012 Phoenix Cruiser model 2552 KA4CSG

Report message to a moderator

Re: Install Duracool/Fan Speed [message #221144 is a reply to message #221140] Wed, 04 September 2013 15:09 Go to previous messageGo to next message
A Hamilto is currently offline  A Hamilto   United States
Messages: 4508
Registered: April 2011
Karma: 39
Senior Member
TL wrote on Wed, 04 September 2013 14:38

Well I achieved success with the install of the duracool with the following:

1. I need a new can tapper so that no duracool is wasted. (ordered today)

2. My blower speed works only on low and medium. I have no high. (why ???)

I was able to get the air temp coming out of the center air to 49 degrees. I think it will go lower when I top off the duracool to the proper fill. I only put in 3 cans of which I lost some due to my poor can tapper. So I probably only got in the system about 2 3/4 cans of duracool. Love the cold air.

My problem is I can't figure out why my blower will not work on high. It works on low and medium, but when I move it to high it just turns OFF. Hopefully someone here knows of a quick and easy fix. Hope so.
Should be an easy fix. The answer is here:

http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=220229&rid=2083&srch=schematically+challenged#msg_220229

and here:
http://www.gmcmhphotos.com/photos/data/2/medium/Fan_Motor_Cirduit_Path_Hi_Speed.jpg
http://www.gmcmhphotos.com/photos/data/2/medium/Fan_Motor_Cirduit_Path_Hi_Speed.jpg

See the four drawings starting here for the other two speeds:
http://www.gmcmhphotos.com/photos/electrical/p50598-heater-and-dash-air-conditioner-wiring.html

Report message to a moderator

Re: Install Duracool/Fan Speed [message #221145 is a reply to message #221144] Wed, 04 September 2013 15:15 Go to previous messageGo to next message
A Hamilto is currently offline  A Hamilto   United States
Messages: 4508
Registered: April 2011
Karma: 39
Senior Member
A Hamilto wrote on Wed, 04 September 2013 15:09

Should be an easy fix. The answer is here:

http://gmc.mybirdfeeder.net/GMCforum/index.php?t=msg&goto=220229&rid=2083&srch=schematically+challenged#msg_220229

and here:
http://www.gmcmhphotos.com/photos/data/2/medium/Fan_Motor_Cirduit_Path_Hi_Speed.jpg

See the four drawings starting here for the other two speeds:
http://www.gmcmhphotos.com/photos/electrical/p50598-heater-and-dash-air-conditioner-wiring.html
Forgot to mention it could be (probably is) that 30A fuse in the high speed circuit where it comes from the alternator. If not, a corroded connector. After that I would suspect the blower relay.

Report message to a moderator

Re: [GMCnet] Install Duracool/Fan Speed [message #221148 is a reply to message #221140] Wed, 04 September 2013 15:17 Go to previous messageGo to next message
emerystora is currently offline  emerystora   United States
Messages: 4442
Registered: January 2004
Karma: 13
Senior Member
Tom

I don't think putting more Duracool in is going to make it colder. If you have 2-3/4 cans in it should be very cold. Putting more in will make it warmer.
The lower the charge (down to a point), the colder it gets. However, too low a charge will usually result in it getting to 32 degrees and freezing the evaporator coils with condensate from the air.

You probably have a bad blower relay or else bad connections to the relay.

Emery Stora

On Sep 4, 2013, at 1:38 PM, Tom Lopez wrote:

>
>
> Well I achieved success with the install of the duracool with the following:
>
> 1. I need a new can tapper so that no duracool is wasted. (ordered today)
>
> 2. My blower speed works only on low and medium. I have no high. (why ???)
>
> I was able to get the air temp coming out of the center air to 49 degrees. I think it will go lower when I top off the duracool to the proper fill. I only put in 3 cans of which I lost some due to my poor can tapper. So I probably only got in the system about 2 3/4 cans of duracool. Love the cold air.
>
> My problem is I can't figure out why my blower will not work on high. It works on low and medium, but when I move it to high it just turns OFF. Hopefully someone here knows of a quick and easy fix. Hope so.
> --
> Manong T, 74 GMC Sequoia
> Madison/De Forest, WI
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

Report message to a moderator

Re: [GMCnet] Install Duracool/Fan Speed [message #221202 is a reply to message #221148] Thu, 05 September 2013 10:38 Go to previous messageGo to next message
Manong is currently offline  Manong   United States
Messages: 88
Registered: July 2007
Location: Madison, WI
Karma: 0
Member
Studied all the wiring diagrams and I think understand them, I hope so. I am now in the process of cleaning all the wires with fuse holders and replacing several that are corroded beyond repair. I,m hoping that is my problem. I cleaned them so good I burned up my rotary tool. Gotta go get another to finish the job. Harbor freight here I come.

Also, is the appearance of a lot of condensation on the ac lines an indication of low refrigerant ? Yesterday while I was running it on the lo and med settings I noticed a lot of condensation on the lines and a constant drip coming out of the driver side front corner of the evaporator encasement dripping down on the air pressure tank. It made a 12" X 12" puddle. Maybe I didn't get as much duracool in as I thought I did. I thought maybe I put in 2 3/4 can but maybe only 2 1/2.

Manong
Madison, WI

Report message to a moderator

Re: [GMCnet] Install Duracool/Fan Speed [message #221205 is a reply to message #221202] Thu, 05 September 2013 10:47 Go to previous messageGo to next message
emerystora is currently offline  emerystora   United States
Messages: 4442
Registered: January 2004
Karma: 13
Senior Member
Tom
Do you have access to air conditioning gauges?
You should test the low side with the air conditioner on high and the engine running at 1500 rpm and report you findings. Also tell us the outside temperature. Also try to do quickly this before the engine runs very long so that the condensor doesn't heat up a lot.

Emery Stora

On Sep 5, 2013, at 9:38 AM, Tom Lopez wrote:

>
>
> Studied all the wiring diagrams and I think understand them, I hope so. I am now in the process of cleaning all the wires with fuse holders and replacing several that are corroded beyond repair. I,m hoping that is my problem. I cleaned them so good I burned up my rotary tool. Gotta go get another to finish the job. Harbor freight here I come.
>
> Also, is the appearance of a lot of condensation on the ac lines an indication of low refrigerant ? Yesterday while I was running it on the lo and med settings I noticed a lot of condensation on the lines and a constant drip coming out of the driver side front corner of the evaporator encasement dripping down on the air pressure tank. It made a 12" X 12" puddle. Maybe I didn't get as much duracool in as I thought I did. I thought maybe I put in 2 3/4 can but maybe only 2 1/2.
> --
> Manong T, 74 GMC Sequoia
> Madison/De Forest, WI
>
> _______________________________________________
> GMCnet mailing list
> Unsubscribe or Change List Options:
> http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

_______________________________________________
GMCnet mailing list
Unsubscribe or Change List Options:
http://temp.gmcnet.org/cgi-bin/mailman/listinfo/gmclist

Report message to a moderator

Re: [GMCnet] Install Duracool/Fan Speed [message #221218 is a reply to message #221202] Thu, 05 September 2013 12:08 Go to previous messageGo to next message
Ken Burton is currently offline  Ken Burton   United States
Messages: 10030
Registered: January 2004
Location: Hebron, Indiana
Karma: 10
Senior Member
TL wrote on Thu, 05 September 2013 10:38

Studied all the wiring diagrams and I think understand them, I hope so. I am now in the process of cleaning all the wires with fuse holders and replacing several that are corroded beyond repair. I,m hoping that is my problem. I cleaned them so good I burned up my rotary tool. Gotta go get another to finish the job. Harbor freight here I come.

Also, is the appearance of a lot of condensation on the ac lines an indication of low refrigerant ? Yesterday while I was running it on the lo and med settings I noticed a lot of condensation on the lines and a constant drip coming out of the driver side front corner of the evaporator encasement dripping down on the air pressure tank. It made a 12" X 12" puddle. Maybe I didn't get as much duracool in as I thought I did. I thought maybe I put in 2 3/4 can but maybe only 2 1/2.


A lot of condensation on the lines and the evaporator is NORMAL and a good thing.


Ken Burton - N9KB
76 Palm Beach
Hebron, Indiana

Report message to a moderator

Re: [GMCnet] Install Duracool/Fan Speed [message #221223 is a reply to message #221202] Thu, 05 September 2013 12:40 Go to previous message
A Hamilto is currently offline  A Hamilto   United States
Messages: 4508
Registered: April 2011
Karma: 39
Senior Member
TL wrote on Thu, 05 September 2013 10:38

Studied all the wiring diagrams and I think understand them, I hope so. I am now in the process of cleaning all the wires with fuse holders and replacing several that are corroded beyond repair. I,m hoping that is my problem. I cleaned them so good I burned up my rotary tool. Gotta go get another to finish the job. Harbor freight here I come. ...
If the fuses are ok, and the blower relay is working, and a PO hasn't mucked with the wiring, then cleaning/repairing the connections should get the hi speed working on the fan. Since it works on lo and med, the fan is fine. Gotta be the 30A fuse, connectors, blower relay, or broken or misrouted wire(s). There isn't that much to the hi speed circuit.

Keep us posted on how it goes.

Report message to a moderator

Previous Topic: Glove box lock
Next Topic: Fan belt adjustment
Goto Forum:
  


Current Time: Sun Oct 06 08:29:12 CDT 2024

Total time taken to generate the page: 0.00727 seconds
.:: Contact :: Home ::.

Powered by: FUDforum 3.1.1.
Copyright ©2001-2021 FUDforum Bulletin Board Software