ac repair

94FormulaBird · 06-28-2012, 01:42 AM

well since its gettin into the hi 90s i better fix my ac...think i have it narrowed down...replacing the expansion valve and dryer...i think i have to add oil to my compressor once the system has been open...how exactly do i go about doin that...

any other info/hints/tricks is appreciated

LXtasy · 06-28-2012, 07:54 AM

Turn system off. You would need to recover all the refrigerant into your unit. Remove txv. Install new txv. Cut dryer out. Solder new one in. Pressurize the system with nitrogen. Remove nitrogen from system if not leaks found. Put vacuum pump on system and vacuum down to about 250-500 microns (i prefer 2xx). Open valves. Turn system on. Let run for awhile. Check charge and add refrigerant if need be.

How do you know that you need a txv and filter dryer and oil added to the compressor?

MARTYROBBINS · 06-28-2012, 08:16 AM

auto or home a/c

LXtasy · 06-28-2012, 08:17 AM

I forgot to ask that Marty. Feel retarded lol. I guess that is what happens when you answer home a/c questions majority of the night. Most likely auto now that I think about it

MARTYROBBINS · 06-28-2012, 08:22 AM

yea well at least you offered up the info at no charge

LXtasy · 06-28-2012, 08:25 AM

Quote:

Originally Posted by MARTYROBBINS

yea well at least you offered up the info at no charge

The info is free. It is the tools to do that job that aren't and most likely won't be had by the norm.

MARTYROBBINS · 06-28-2012, 08:51 AM

belive me i know just how expensive the tools are i have purchsed many a/c tools for my previous line of employment

LXtasy · 06-28-2012, 08:54 AM

Glad to see you got out. lol. Trying to do the same now.

MARTYROBBINS · 06-28-2012, 09:28 AM

yea what a move i made from doing a/c to working on cars i dont know what's worse
but now i have a nice job in the a/c at a computer with a tv got the good life

94FormulaBird · 06-28-2012, 04:22 PM

Auto...I read somewhere that the compressor needed to come off...buddy told me today that the canned of oil are similar to the freon

MARTYROBBINS · 06-28-2012, 04:35 PM

best to drain the system if you got access to a auto a/c machine it will drain the oil if not you can pull the compressor and drain it or buy the whole a/c kit from vato zone or lakeshore and replace it all

BAD BOB · 06-28-2012, 08:11 PM

it would help if you could tell us what is going on with it. if your pressures are out of wack then that could mean something.

94FormulaBird · 06-28-2012, 08:22 PM

Low side is low...hi side is hi...added freon pressures go up and air doesn't get colder ....feels like the heat is on ...compressor works obviously

BAD BOB · 06-28-2012, 08:40 PM

to me it sounds like the orfice tube may have a blockage. If that is the case the normal thing that will contaminate it is a compressor coming apart. With it blocked the pressure will be higher than normal bc of the extra restriction. if the fans are coming on i would probably pull that out and see what it looks like. I dont believe many gm dryers will cause and issue like that bc i think they are in the return side of the system.

BAD BOB · 06-28-2012, 08:40 PM

how low is the low side and how high is the high side?

shdw on th sun · 06-28-2012, 10:00 PM

Quote:

Originally Posted by BAD BOB

it sounds like the orifice tube may have a blockage

I'll see myself out

gearmesh, inc. · 06-28-2012, 10:40 PM

High side too high along with low side too low is most likely a restricted orifice tube. Usually the only thing that clogs them up is internal compressor debris. All it takes is for just one cylinder of a 10 cylinder compressor to take a crap. The other 9 will still pump adequately to see the pressures you described.

If you do have a clogged orifice, make sure you flush your condenser or get a new one. The stuff on a clogged orifice is the compressor junk that managed to get through the condenser. Some of these newer uber efficient condensers don't flush all that well, so replacement is a safe bet to keep the rest of your parts investment alive.

BAD BOB · 06-28-2012, 11:39 PM

Quote:

Originally Posted by shdw on th sun

I'll see myself out

say what? was there a problem with that statement?

94FormulaBird · 06-29-2012, 09:19 AM

From what I read lt1s don't have orifice tubes they have expansion valves...and I don't remember the pressure readings...been about a month since I checked

ForceFed4g63 · 06-29-2012, 09:42 AM

Quote:

Originally Posted by BAD BOB

say what? was there a problem with that statement?

Orifice...tube...blockage...

06-28-2012, 01:42 AM	#1
94FormulaBird Senior Member Join Date: Jun 2008 Location: Goose Creek Posts: 763	ac repair well since its gettin into the hi 90s i better fix my ac...think i have it narrowed down...replacing the expansion valve and dryer...i think i have to add oil to my compressor once the system has been open...how exactly do i go about doin that... any other info/hints/tricks is appreciated __________________

06-28-2012, 07:54 AM	#2
LXtasy Senior Member Join Date: Dec 2006 Location: Summerville, SC Posts: 9,564	Turn system off. You would need to recover all the refrigerant into your unit. Remove txv. Install new txv. Cut dryer out. Solder new one in. Pressurize the system with nitrogen. Remove nitrogen from system if not leaks found. Put vacuum pump on system and vacuum down to about 250-500 microns (i prefer 2xx). Open valves. Turn system on. Let run for awhile. Check charge and add refrigerant if need be. How do you know that you need a txv and filter dryer and oil added to the compressor? __________________

06-28-2012, 08:17 AM	#4
LXtasy Senior Member Join Date: Dec 2006 Location: Summerville, SC Posts: 9,564	I forgot to ask that Marty. Feel retarded lol. I guess that is what happens when you answer home a/c questions majority of the night. Most likely auto now that I think about it __________________

06-28-2012, 08:54 AM	#8
LXtasy Senior Member Join Date: Dec 2006 Location: Summerville, SC Posts: 9,564	Glad to see you got out. lol. Trying to do the same now. __________________

06-28-2012, 04:22 PM	#10
94FormulaBird Senior Member Join Date: Jun 2008 Location: Goose Creek Posts: 763	Auto...I read somewhere that the compressor needed to come off...buddy told me today that the canned of oil are similar to the freon __________________

06-28-2012, 08:16 AM	#3
MARTYROBBINS Senior Member Join Date: Nov 2011 Location: NORTH CHARLESTON Posts: 593	auto or home a/c

06-28-2012, 08:22 AM	#5
MARTYROBBINS Senior Member Join Date: Nov 2011 Location: NORTH CHARLESTON Posts: 593	yea well at least you offered up the info at no charge

06-28-2012, 08:51 AM	#7
MARTYROBBINS Senior Member Join Date: Nov 2011 Location: NORTH CHARLESTON Posts: 593	belive me i know just how expensive the tools are i have purchsed many a/c tools for my previous line of employment

06-28-2012, 09:28 AM	#9
MARTYROBBINS Senior Member Join Date: Nov 2011 Location: NORTH CHARLESTON Posts: 593	yea what a move i made from doing a/c to working on cars i dont know what's worse but now i have a nice job in the a/c at a computer with a tv got the good life

06-28-2012, 04:35 PM	#11
MARTYROBBINS Senior Member Join Date: Nov 2011 Location: NORTH CHARLESTON Posts: 593	best to drain the system if you got access to a auto a/c machine it will drain the oil if not you can pull the compressor and drain it or buy the whole a/c kit from vato zone or lakeshore and replace it all

06-28-2012, 08:11 PM	#12
BAD BOB Senior Member Join Date: Mar 2008 Location: SUMMERVILLE Posts: 3,681	it would help if you could tell us what is going on with it. if your pressures are out of wack then that could mean something. __________________ IM BAD BOB

06-28-2012, 08:22 PM	#13
94FormulaBird Senior Member Join Date: Jun 2008 Location: Goose Creek Posts: 763	Low side is low...hi side is hi...added freon pressures go up and air doesn't get colder ....feels like the heat is on ...compressor works obviously __________________

06-28-2012, 08:40 PM	#14
BAD BOB Senior Member Join Date: Mar 2008 Location: SUMMERVILLE Posts: 3,681	to me it sounds like the orfice tube may have a blockage. If that is the case the normal thing that will contaminate it is a compressor coming apart. With it blocked the pressure will be higher than normal bc of the extra restriction. if the fans are coming on i would probably pull that out and see what it looks like. I dont believe many gm dryers will cause and issue like that bc i think they are in the return side of the system. __________________ IM BAD BOB

06-28-2012, 10:40 PM	#17
gearmesh, inc. creepy azz cracka Join Date: Nov 2008 Location: Summerville Posts: 1,587	High side too high along with low side too low is most likely a restricted orifice tube. Usually the only thing that clogs them up is internal compressor debris. All it takes is for just one cylinder of a 10 cylinder compressor to take a crap. The other 9 will still pump adequately to see the pressures you described. If you do have a clogged orifice, make sure you flush your condenser or get a new one. The stuff on a clogged orifice is the compressor junk that managed to get through the condenser. Some of these newer uber efficient condensers don't flush all that well, so replacement is a safe bet to keep the rest of your parts investment alive. __________________ "I came into this world kicking, screaming,and covered in someone else's blood, I have no problem leaving the same way!" ÔÇ£If you carry a gun, people will call you paranoid. ThatÔÇÖs ridiculous. If I have a gun, what in the hell do I have to be paranoid about?ÔÇØ -Clint Smith, Thunder Ranch.

06-29-2012, 09:19 AM	#19
94FormulaBird Senior Member Join Date: Jun 2008 Location: Goose Creek Posts: 763	From what I read lt1s don't have orifice tubes they have expansion valves...and I don't remember the pressure readings...been about a month since I checked __________________