AC help

[89GMCJOHN]

"New" compressor ordered off Amazon .....

 

[Deathpunch0311]

Did you order a new orifice and accumulator too? There could be trash, debris, and other containments in the system. Make sure you purge everything with nitrogen after you install all the new componets. To check for leaks and to aid getting any moisture out of the system. DO NOT USE COMPRESSED AIR OR OXYGEN!!!

Before you charge that “new” compressor. Make sure you pull a good deep vacuum. I like to go to at least 700 microns on a car ac system.

If you just through the new compressor and don’t do what’s listed above, that new compressor is going to fail, and fail quick. Then your ENTIRE system is containmented with the burnt compressor oil and components.

 

[shorepatrol]

Did you order a new orifice and accumulator too? There could be trash, debris, and other containments in the system. Make sure you purge everything with nitrogen after you install all the new componets. To check for leaks and to aid getting any moisture out of the system. DO NOT USE COMPRESSED AIR OR OXYGEN!!!

Before you charge that “new” compressor. Make sure you pull a good deep vacuum. I like to go to at least 700 microns on a car ac system.

If you just through the new compressor and don’t do what’s listed above, that new compressor is going to fail, and fail quick. Then your ENTIRE system is containmented with the burnt compressor oil and components.

Flush and pull a vacuum is fine on auto ac. I replace the accumulator as well. Nitrogen is for home ac install when brazing in lines

 

[Deathpunch0311]

Flush and pull a vacuum is fine on auto ac. I replace the accumulator as well. Nitrogen is for home ac install when brazing in lines

I know, that’s what I do for a living. But can’t break some habits

 

[shorepatrol]

I know, that’s what I do for a living. But can’t break some habits

Did it for a bit myself lol

 

[Mike Napolitano]

I threw a pressure gage on the system tonight and its reading zero....I turned the ac on to max cool .....I then pulled the low pressure cutout switch connector off the side of the receiver dryer and jumpered a piece of wire across the connector terminals . Voila the compressor clutch engaged. So the compressor wasnt turning on because the system has no refrigerant in it . It threw rust dust off it and chattered a little then finally calmed down ...I dont think its spun up in yrs ..the ports on the system are the R134a quick connect type ...so I assume someone down the line converted it over to R134A ...I looked the compressor p/n up and its an R134A compressor ..I am trying the SUB ZERO brand 18 oz recharge kit ..1 oz of that is additives -leak sealer...so tomorrow night after work I will try to charge it for the first time ......wish me luck ........

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Do not use any Freon with sealer in it it will clog the a/c system. The sealer needs air to dry and if you have air in your system it will dry and clog. Before putting a charge in it, reseal the entire system with all new o-rings and new orfice tube, also pressure test condenser and spray it with soapy water and if no bubbling then it is good. Add proper charge of oil with dye in it by filling the compressor or accumulator dryer, then connect all line and put a vacuum pump on it for 1 hour and then charge with proper amount of Freon also make sure the condenser is a 134a one because there is a difference between 134a and r12

 

[c1500deathtrap]

I'd take the opportunity to upgrade to a sanden style compressor.

 

[tom joyce]

If you pulled a vacuum in the first place before jumping the compressor and charging it, you would have found the seal leaks that you probably still have, been able to fix them for a fraction of the price, and you probably would have been ok.
Your compressor failed because there is air in the system, which turns the refrigerant to an acidic corrosive liquid that kills everything. It is known as 'black death'.
Now, you have to flush the system, or better yet, simply replace EVERYTHING. There are bits and pieces of debris in your system now, and they will kill the new compressor just as fast as 'black death'. Replace ALL of the seals - then install the compressor, then pull a vacuum on the system for an hour or two - check that the vacuum holds for at least 15 minutes (if not there is a leak), then lastly charge it...

 

[89GMCJOHN]

HELP ...where is the orifice tube located in a 1989 1500 Sierra ? I cant find the exact location on an exploded view drawing anywhere and I am going to go ahead and replace mine when swapping out the compressor .

 

[89GMCJOHN]

On my 1989 it's on the passenger fender high pressure line

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