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New components - a few final questions

Fishermark on Tue May 19, 2009 10:13 AM User is offlineView users profile

Year: 1991
Make: Chevy
Model: G20- Sportvan
Engine Size: 5.7
Refrigerant Type: 134a

This is a follow-up to another series of questions.
Original Post here

I have physically removed the front and rear evaporators as I wanted to check on their condition. They both appear to be in good shape, with little to no debris on the O-tube. I will be flushing both units. I am replacing the expansion valve in the back and a new O-tube at the evaporator of course. New compressor, new parallel flow condenser, new accumulator. Using the DEC Pag 150.

1. Since the system requires 11 ozs of oil - where do I put it? 3 -4 ozs in the compressor and the rest in the accumulator? (The compressor came with no oil). That seems like a lot of oil to simply pour into the accumulator.

2. I have a good set of gauges, and a vacuum pump, but no scale. I only have the little cans of 134a (12 oz cans I believe). Six cans would be 72 ozs. Is that a safe way to go, or would I be better off taking it to a shop for a charge?

3. The only thing I couldn't buy that I wanted to replace was the hose assembly at the compressor. It has a muffler and I have read where they can be difficult to flush - plus I don't know whether it is in good condition. The problem is I cannot find a new hose assembly. No one seems to stock it. What's the best course of action? Have someone cut out the muffler and bypass it? Take the assembly in to a shop for a flush and / or rebuild?

Here's a pic:




Thanks for the help!

TRB on Tue May 19, 2009 10:48 AM User is offlineView users profile

Is this a dual unit system and have you flushed the entire system out removing all oil and debris?

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Fishermark on Tue May 19, 2009 11:15 AM User is offlineView users profile

This is a dual system and I will indeed flush the entire system out. I have physically removed every single component (since I had no idea of its condition as I just got the van). The hoses running to the back appear to be in good condition. The rear evaporator appears very clean and corrosion free. I have it out and on my workbench - along with the front evaporator. They both appear in very good condition. When I pulled the O tube out there was very little, if any, debris on the tube.

I have the following brand new (not rebuilt) items to install:
- new universal (15X30) parallel flow condenser
- new compressor
- new accumulator
- new expansion valve
- new o tube (staying with Chevy White)
- 2 bottles of DEC PAG 150

Everything will be either flushed or brand new, so there will be no residual oil anywhere in the system.

TRB on Tue May 19, 2009 11:23 AM User is offlineView users profile

Put 7 ounces in the compressor and the rest in the accumulator and condenser. Do this only so you do not oil slug the compressor. Nitrogen or compressed air through the hose you can't replace will be fine.

-------------------------

When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com

mk378 on Tue May 19, 2009 12:08 PM User is offline

Also I would suggest a pressure test before committing to a full charge. You have quite a few unknown old parts and newly made-up joints that could leak.

Fishermark on Tue May 19, 2009 1:00 PM User is offlineView users profile

Regarding the pressure test - if it holds a vacuum, isn't that sufficient?

Also - what do you recommend about the hose / muffler assembly? THAT'S my biggest unknown right now, and I am not sure what direction to go with that at this point.

HECAT on Tue May 19, 2009 1:30 PM User is offline

I would be more concerned about what is in that hose/muffler if you had found a severely contaminated system.

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FLUSHING TECHNICAL PAPER vs2.pdf 

TRB on Tue May 19, 2009 1:42 PM User is offlineView users profile

Quote
Originally posted by: HECAT
I would be more concerned about what is in that hose/muffler if you had found a severely contaminated system.

Agreed!


No while pulling a vacuum can indicate a closed system. Nothing can show signs of leaks like a full system under load.



-------------------------
When considering your next auto A/C purchase, please consider the site that supports you: ACkits.com
Contact: ACKits.com


Edited: Tue May 19, 2009 at 2:41 PM by TRB

Fishermark on Tue May 19, 2009 2:36 PM User is offlineView users profile

How do I go about conducting a pressure test without charging the system?

And what is your feeling - good idea or no? - about charging using the cans?

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