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'99 w/ no a/c working.....questions


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Old 05-28-2009, 03:34 PM   #1
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'99 w/ no a/c working.....questions

Where I used to live I really didn't need an a/c........so I haven't used it in about 3 yrs and it doesn't work now that I need it here in the Ozarks this summer.

From past experience the w/ GM a/c in my old Buick, I know the compressor seals can dry out when it's not used frequently. I'm hoping that is all that's wrong with mine now, since I lost my job and money is scarce!!

Since my compressor doesn't even try to spin right, would it be a problem if I put in one of those replacement freon cans that I bought from a parts store even though the compressor is not turning?? Or, does the compressor have to be running before the system will accept some freon??

I'd like to try to put in some freon with the engine stopped, then start up and turn on the a/c to see if there's enough in it to activate the compressor. I think my system holds less than 2lbs., for a '99 2dr Blazer.

Any advice will be greatly appreciated!!
Thanks,
Old 05-28-2009, 03:35 PM   #2
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Re: '99 w/ no a/c working.....questions

is your ac clutch engauging?
Old 05-28-2009, 03:36 PM   #3
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Re: '99 w/ no a/c working.....questions

No.....nothing happens.
Old 05-28-2009, 03:40 PM   #4
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Re: '99 w/ no a/c working.....questions

the compressor doesn't have to be running to accept refrigerent...def try and put some in first before you do anything else...it simply may be out or low...the low pressure switch will kill everything if theres not enough refrigerent in it
Old 05-28-2009, 03:51 PM   #5
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Re: '99 w/ no a/c working.....questions

Quote: Originally Posted by layinlow88
the compressor doesn't have to be running to accept refrigerent...def try and put some in first before you do anything else...it simply may be out or low...the low pressure switch will kill everything if theres not enough refrigerent in it
Thanks man, that answers my question. I'll go try to see if it will accept some freon before I do anything else. Do those little cans of R-134A have to be in the upright position before the freon will go into the a/c system? It's got a short little hose. Do I have to shake them up first?? Never done this before!!
Old 05-28-2009, 03:53 PM   #6
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Re: '99 w/ no a/c working.....questions

it says on the can, i believe that you have to put them upside down when adding the r134a
Old 05-28-2009, 03:57 PM   #7
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Re: '99 w/ no a/c working.....questions

yep...lee-mill is right...upside down and you dont have to shake it....you can buy yourself a longer hose for cheap...you also may want to have a small bucket of warm water ready..sometimes you have to lay the can in it to get the refrigerent moving...it tends to get stuck because its so cold...so warm water will help out alot
Old 05-28-2009, 04:00 PM   #8
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Re: '99 w/ no a/c working.....questions

Alright, it's best to have your engine running and a/c on, that way when you get enough refrigerant in the system, it will engage the clutch and then adding it will be easier and faster. Most can's come with a gauge to check the level, so that can come in handy. A quick way to check the system is use a jumper on the low side pressure switch, that will bypass it and if the clutch engages, then you know that you are probably low on refrigerant. And yes, you want to hold the can upside down and slowly tilt it from side to side for the best results.
Old 05-28-2009, 04:06 PM   #9
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Re: '99 w/ no a/c working.....questions

Quote: Originally Posted by layinlow88
yep...lee-mill is right...upside down and you dont have to shake it....you can buy yourself a longer hose for cheap...you also may want to have a small bucket of warm water ready..sometimes you have to lay the can in it to get the refrigerent moving...it tends to get stuck because its so cold...so warm water will help out alot
Thanks for the good info, guys! I'll give it a try this afternoon or tomorrow.

Is it better doing the refill when the weather is hot, rather than a cool day like it is here today? Maybe I'll wait 'till tomorrow when it's supposed to alot warmer.
Old 05-28-2009, 04:14 PM   #10
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Re: '99 w/ no a/c working.....questions

yes...its better to do it with the day warm...this allows the system to get up to operating pressures...which also allows the refrigerent to move around a little more freely

I've been an AC tech for about two years now...you dont HAVE to have the compressor running to get all of it in there...sometimes its better not to have it on because within the refrigerent is a lubricant for the compressor...but do turn it on when you start getting close to having it full...be sure to check and see how much you have in it as often as possilbe with and w/out the compressor running
Old 05-28-2009, 05:58 PM   #11
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Re: '99 w/ no a/c working.....questions

Quote: Originally Posted by layinlow88
yes...its better to do it with the day warm...this allows the system to get up to operating pressures...which also allows the refrigerent to move around a little more freely

I've been an AC tech for about two years now...you dont HAVE to have the compressor running to get all of it in there...sometimes its better not to have it on because within the refrigerent is a lubricant for the compressor...but do turn it on when you start getting close to having it full...be sure to check and see how much you have in it as often as possilbe with and w/out the compressor running
Well guys.......I got enough in it now, that the compressor is engaging.......quite rapidly......but at least it's taking the freon. This appears to be a REALLY slow process with these little cans!! Is that correct??

The gauge on the can I bought shows right at the "full" mark blue area, when I'm NOT pulling the trigger, but drops down to the half mark of the green "low freon" range when I AM pulling the trigger to release the freon. Which reading should I be most concerned about??? I'm assuming the green low freon reading is the one I should really watch to be sure I don't overfill the system while I'm releasing the freon! Sound right?? I hope this makes some sense!
Old 05-28-2009, 06:00 PM   #12
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Re: '99 w/ no a/c working.....questions

yea those cans are a pain in the ass someimtes to fill, just kept adding it till their empty
Old 05-28-2009, 06:07 PM   #13
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Re: '99 w/ no a/c working.....questions

DONT over fill it, those hoses can and might blow up in your face!If you put one of those cans in there and ther compressor is cycling(coming on and off) add another can. I just got done doing mine on a 02 blazer, look..
right at MAX full

the air temp coming out of the vents.
Old 05-28-2009, 06:09 PM   #14
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Re: '99 w/ no a/c working.....questions

You dont want to over charge it is the thing. Then it will be like having no ac again.
Old 05-28-2009, 06:10 PM   #15
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Re: '99 w/ no a/c working.....questions

im 100% sure one can will not overfill it. i think the cans at autozone are like 10,or 14oz and your system needs almost double that. since ac hasnt been used in a couple years he will be fine with one can
Old 05-28-2009, 06:15 PM   #16
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Re: '99 w/ no a/c working.....questions

Is this picture reading done while you are releasing the freon?? Or, with no freon going into the system but just with the hoses hooked up?

Quote: Originally Posted by s10-den
DONT over fill it, those hoses can and might blow up in your face!If you put one of those cans in there and ther compressor is cycling(coming on and off) add another can. I just got done doing mine on a 02 blazer, look..
right at MAX full

the air temp coming out of the vents.
Old 05-28-2009, 06:17 PM   #17
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Re: '99 w/ no a/c working.....questions

Its done my friend.Just the line hooked up showing charged. I added 3 cans ,I had to redo the entire ac in my blazer


lee I know one can wont over fill, but just making sure he dont add to much..

Last edited by s10-den : 05-28-2009 at 06:18 PM.
Old 05-28-2009, 06:18 PM   #18
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Re: '99 w/ no a/c working.....questions

ahhhh ok good call haha
Old 05-28-2009, 06:26 PM   #19
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Re: '99 w/ no a/c working.....questions

Hey Fixvet, I dont know how many ounces are in the big can you use, but her is what I used...Is the can you are using silver and tall?

Last edited by s10-den : 05-28-2009 at 06:28 PM.
Old 05-28-2009, 06:31 PM   #20
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Re: '99 w/ no a/c working.....questions



</IMG>Here is what you are using I think
Old 05-28-2009, 07:05 PM   #21
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Re: '99 w/ no a/c working.....questions

Quote: Originally Posted by s10-den


</IMG>Here is what you are using I think
Yeah, it's a tall can with a trigger to pull to release the freon. It says 18oz total, w/ I think 12oz of freon, and the rest is oil and some o-ring seal stuff.

Right now, when I'm hooked onto the port without pulling the trigger...... the gauge reads about like your picture, but the compressor only cycles very quickly and doesn't stay on for very long at all, like 1-2 sec. only. I'm assuming I'm still low, right?? The air blowing out is not cool or cold at all yet.

But, when I'm pulling the trigger and releasing freon, the gauge drops back into the green "low freon" part of the gauge.

I assume I'm not full yet, because the compressor cycles so fast! I'll try to put some more in after supper! It's pretty cool here today, so maybe that is slowing down the process.

Last edited by Fixvet : 05-28-2009 at 07:07 PM.
Old 05-29-2009, 12:22 AM   #22
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Re: '99 w/ no a/c working.....questions

You check the level when you aren't adding freon, so when you aren't pulling the trigger.
Old 06-23-2009, 04:45 PM   #23
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Re: '99 w/ no a/c working.....questions

any updates fixvet??

This was a good thread to get some info. I thought you had to bring it to a shop to re-fill, but I guess not. Gotta go buy a kit for my truck, it's warm when the A/C is on.
Old 06-23-2009, 05:03 PM   #24
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Re: '99 w/ no a/c working.....questions

Quote: Originally Posted by tt85_GM
any updates fixvet??

This was a good thread to get some info. I thought you had to bring it to a shop to re-fill, but I guess not. Gotta go buy a kit for my truck, it's warm when the A/C is on.
It's very weird that you asked today, because I just had it filled at the local Mieneke Auto Care Center down the street from where I live.........2lbs of freone installed for $46. This was after I've been messing around with the install-it-yourself cans that I got at the parts store. I don't know what I was doing wrong, but I just could not get enough freon in the system to get it cold. The compressor cycled finally, but very quickly and the air was still warm or hot. I got fed up trying I guess, and called around yesterday and found that Mieneke would fill it completely for $46, so just got back from their shop. I could have had them do alot of diagnositics and leak checking for about $50 more, but figured all I really needed was the fillup. I've been thru this routine with other cars that had dry compressor seals when I didn't use the a/c often enough, so just did the fillup today and will watch my little thermometer I have stuck in the center vent to monitor the air temp. I'm pretty sure I'm good to go now!!

Good luck!
Old 06-23-2009, 09:44 PM   #25
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Re: '99 w/ no a/c working.....questions

Wow, your lines are feezing at 20 degrees! I can't get mine below 60 unless I'm going down the highway. Everything is new too.
Old 06-25-2009, 05:16 PM   #26
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Re: '99 w/ no a/c working.....questions

woohoo got mine working again, it was low like 10psi, charged it to 40psi, the vent temp is 40 deg which is what the factory spec calls for.

s10-den how did you get down to 20 deg??
Old 06-26-2009, 03:24 PM   #27
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Re: '99 w/ no a/c working.....questions

Quote: Originally Posted by tt85_GM
s10-den how did you get down to 20 deg??
x2?!?!?
Old 06-26-2009, 08:57 PM   #28
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Re: '99 w/ no a/c working.....questions

Imported snow down here to Florida...frost blowing out of the vents!
Seriously, I had to take apart the whole system in mine.CLEANED all the trash out of the lines and the condensor,had to get new comp.,evaporator,dryer and believe it or not , a high performance orifice tube.(they work)
Basically just: a good clean system, GOOD vacume,right amount of oil, and a full charge which you can see right over 40#'s is fully charged.Driving down the road, its has got to 14* and actually shut the compressor off till the temp went to back up 16*, weird, I never had that happen before. but those do it yourself kits work at the parts house, dont let anyone say they dont...
Old 06-27-2009, 05:10 PM   #29
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Re: '99 w/ no a/c working.....questions

Quote: Originally Posted by s10-den
Imported snow down here to Florida...frost blowing out of the vents!
Seriously, I had to take apart the whole system in mine.CLEANED all the trash out of the lines and the condensor,had to get new comp.,evaporator,dryer and believe it or not , a high performance orifice tube.(they work)
Basically just: a good clean system, GOOD vacume,right amount of oil, and a full charge which you can see right over 40#'s is fully charged.Driving down the road, its has got to 14* and actually shut the compressor off till the temp went to back up 16*, weird, I never had that happen before. but those do it yourself kits work at the parts house, dont let anyone say they dont...
true..worked for me



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