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Old 04-03-2012, 03:58 PM   #1
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Oshkosh/JD Chassis AC System

Here I am again, 1991 Oshkosh Chassis AC system questions
Got mine blowing cold air, problem is, it is all going to the defrosters with just a dribble going the four dash vent and the two floor vents.
There is a vacuum operated valve behind the passenger glove box that if I move it manually against the spring pressure it then directs the air out the aformentioned vents.
I have noticed there is three tiny plastic vacuun lines under the dash, colors green, white and black
I can see in the engine firewall where the white and black come out but there is no connection or enough line sticking out to make one. There is a suction valve on the back of the heater box with a suction line dangling down. I assume that connects to either the white or black line coming thru the firewall. The valve behind the glove box has the green line connected but there is no suction
there is a third valve under the dash near the floor but I cannot get to it......YET. There must be a main source of suction somewhere going to the controller and that directs the suction to one of the three suction valves that I have found
Does anyone have a diagram of the suction system for the AC system?
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Old 04-03-2012, 05:56 PM   #2
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Thats a RV mfg add on (not Oshkosh/JD). You will have to locate AC unit mfg information on the unit itself.

Dave
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Old 04-03-2012, 06:04 PM   #3
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Originally Posted by Dave78Chief View Post
Thats a RV mfg add on (not Oshkosh/JD). You will have to locate AC unit mfg information on the unit itself.

Dave
It's a frigi-cool
serial number H/C 206 008280

Does that help?
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Old 04-03-2012, 07:18 PM   #4
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There has to be a vacuum source. From the engine or a small 12v vacuum pump with a reservoir.
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Old 04-03-2012, 07:39 PM   #5
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Usually a manifold source to the dash selector.. mine is a standard Dodge '80's push button unit...
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Old 04-04-2012, 10:42 AM   #6
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Usually a manifold source to the dash selector.. mine is a standard Dodge '80's push button unit...
I am talking about the under dash RV AC system, A few weeks ago I re-charged
the system and upgraded it to R-134A and got it making very cold air but no
matter what button I pushed air came out the defrosters hard with a trickle to
the dash vents or the floor vents

I traced all the little different colored plastic vacuum lines from each
actuator back to the control panel and untangling them as I went into one nice
and neat group, I had a white line, a green line, a black line and a red line
the green, black and red all ran from the control panel went to an actuator the
white just disappeared into a big hunk of foam and silicone. I carefully dug
around in there and found the white line was broken off coming from that pile of
goo going into the front of the rv radiator, once I cleared it out I was able to
pull about two feet of white line out from under the dash and then the issue
became, where does it go?

There is big black plastic ball with two diff sized nipples sticking out of it
and nothing attached to it. Whaddayaknow one of them is the perfect size to
connect the white line to. The other day I found a heavier but small rubber hose
that looked like a vacuum line but it was not connected to anything, sticking
out over the radiator. Did not know what is was for.

I found a vac source on the intake manifold that had a length of the same size
rubber hose with a plug in it. So I traced that rubber hose and it could almost
reach that black plastic ball, I cut off several tie wraps and it reaches now
and was a perfect fit. Now to find the other end, after some searching and
getting into some God awful positions to look, I found the other end under some
water lines and not connected to anything. I disconnected that hose with the
plug on the intake manifold and connected this newly found hose to the vacuum
source, perfect fit.

I started the motor, turned on the ac,. pressed the max button and air comes
pouring out of all the dash vent, I hit the bi level button and air now comes
from the dash vents and the floor vents, push the defrost button and air comes
out the defroster vents again, push the heat button and air comes hard from the
floor vent and decent from the dash vents
It works like it is supposed to work

The black ball is a vacuum storage chamber. After I turned the motor off I could
push all the diff buttons and hear valves opening and closing under the dash.

The white line was the vac source from the vac storage to the control panel
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Old 04-04-2012, 11:37 AM   #7
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Congradulations - Ahh, welcome to the world of restoration. This is a great example of how one must use doggied determination to figure it out. Unfortunantly there are many things that you will not be able to find detailed documentation on so knowing basics is essential. For reference, there are some parts houses for automotive AC stuff. Some even indicate they have Frigi-Cool parts. Just have to Google them.

Dave
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Old 04-04-2012, 11:49 AM   #8
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Congradulations - Ahh, welcome to the world of restoration. This is a great example of how one must use doggied determination to figure it out. Unfortunantly there are many things that you will not be able to find detailed documentation on so knowing basics is essential. For reference, there are some parts houses for automotive AC stuff. Some even indicate they have Frigi-Cool parts. Just have to Google them.

Dave
Thank you very much
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Old 04-04-2012, 02:45 PM   #9
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Thank you very much
Now that I have the ac running good I have two other issues, see attached pictures
First picture is the back of the unit as seen from the front of the RV, you can see what appears to be the condensate drain, but nothing comes out of it. I do have water seeping out all along the bottom seam. I blew some air pressure in that tube but it did nothing, there is no room to unscrew the fitting because the vacuum valve is in the way and I have no clue how to remove that.

Second picture is the new low press fitting which is screwed over the original R-12 fitting, I saw bubbles in the view port on top of the dryer and wanted to add some more R-134A but the filler hose fitting will not attach. It almost looks as it something has broken off in that new fitting. Looking at the fitting on the filler hose it also appears to be broken or missing something. In the original conversion instruction it mentions there is a thread locker seal in the new fitting and once it is screwed on it becomes a permanent part and cannot be unscrewed without damaging the AC line

Any ideas Gang?? and why this switched to italics is a mystery to me, how did that happen?
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Old 04-04-2012, 03:12 PM   #10
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Quote:
Originally Posted by Bilito View Post
I am talking about the under dash RV AC system, ...
So was I.. And, you found the vacuum reservoir... which is fed from a manfold source..
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Old 04-04-2012, 03:20 PM   #11
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I am not an AC man so I have no help with that other than say google

Did accidently hit the italic button () above the reply box?
You can use the Remove all formating button () to remove it when posting. Simply Highlight the offending text and select

Dave
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Old 04-04-2012, 03:44 PM   #12
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I am not an AC man so I have no help with that other than say google

Did accidently hit the italic button () above the reply box?
You can use the Remove all formating button () to remove it when posting. Simply Highlight the offending text and select

Dave
it just happens in the middle of a sentence sometimes
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Old 04-05-2012, 12:51 PM   #13
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it just happens in the middle of a sentence sometimes
We just gotta have an ac guy on this site that can help me with this problem
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