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Old 07-26-2019, 02:34 PM   #1 (permalink)
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Car Air Conditioning Tech In GCC........

2004 Grand Prix. On snappy ac machine low pressure is 25, high pressure is 75-100. Obviously won't blow cold. With pressures so low we put a compressor on it. Used from LKQ.(ya ya ya I know, but its a cheap car). That first compressor did nothing, so I had lkq send me another one. Same pressures, not cold. We put an expansion valve in it, no change. I took it to a buddies shop and he said "put a new compressor on it". So I did, brand new. No change. Read online maybe the condenser is slightly plugged, so I ordered a new one. While it was out we flushed the lines, both ways. Put an hour of vacuum on the system, refilled and no change. What am I missing here?

cliffs:

3 compressors
1 expansion valve
1 condenser
system flush

still not cold.
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Old 07-26-2019, 02:40 PM   #2 (permalink)
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Not sure if it will help your situation or not, but everytime you open up a system you should change the filter drier. Especially after a compressor change.
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Old 07-26-2019, 02:41 PM   #3 (permalink)
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Sounds under charged with those pressure's.... With the AC off, depending on temperature, should have both at 75-100. Running, high side should be up closer to 200, and low side around 30-40.... You sure you're not mixing "kg and lbs" when you're charging it?

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Old 07-26-2019, 02:46 PM   #4 (permalink)
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2.2lbs, or .997kg of r134a according to alldata. Sound right?

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Old 07-26-2019, 02:54 PM   #5 (permalink)
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Undercharged. At about 90 degree ambient temp, 45 to 55 PSI on the low side, around 250 or little more high side. Just did a 2002 Blazer compressor last weekend. Charge it and then let it sit for about 15 minutes and recheck..

http://rechargeac.com/how-to/ac-system-pressure-chart
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Old 07-26-2019, 02:58 PM   #6 (permalink)
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Sounds under charged with those pressure's.... With the AC off, depending on temperature, should have both at 75-100. Running, high side should be up closer to 200, and low side around 30-40.... You sure you're not mixing "kg and lbs" when you're charging it?

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No, not mixing up the freedom units vs communist units! I just checked our napa resource and it shows 2.4#. I could swear my mechanic just told me 2#. That could be the problem. F me running.
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Old 07-26-2019, 03:14 PM   #7 (permalink)
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2.2lbs, or .997kg of r134a according to alldata. Sound right?

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Could .2 to .4 deficit be enough to make these numbers? I texted by tech and he said he's been putting in 2#. The sticker on the car shows 2.3#. ugh
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Old 07-26-2019, 04:48 PM   #8 (permalink)
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Charge until the return line into the compressor is cold. When that line is so cold that when you grab and squeeze it the cold hurts, the system is properly filled.

Pressures vary with ambient temperature. The system needs cold return to cool the compressor and it also shows that there is no liquid in the evaporator, because some is expanding after it.

This is the plain and simple way to do it and it works.
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Old 07-26-2019, 06:15 PM   #9 (permalink)
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Charge until the return line into the compressor is cold. When that line is so cold that when you grab and squeeze it the cold hurts, the system is properly filled.

Pressures vary with ambient temperature. The system needs cold return to cool the compressor and it also shows that there is no liquid in the evaporator, because some is expanding after it.

This is the plain and simple way to do it and it works.
no, grandpa
thanks to the magic of the CPEV and TXV you'll blow the fuck outta the burst disc before you get anywhere near painful cold on the low side
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Old 07-26-2019, 06:17 PM   #10 (permalink)
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no, grandpa
thanks to the magic of the CPEV and TXV you'll blow the fuck outta the burst disc before you get anywhere near painful cold on the low side
Get off my lawn.





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Old 07-26-2019, 09:23 PM   #11 (permalink)
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Could .2 to .4 deficit be enough to make these numbers? I texted by tech and he said he's been putting in 2#. The sticker on the car shows 2.3#. ugh
Typically no, but I would evac and pull a deep vacuum on it then refill by weight and make sure you are putting liquid in and not gas.
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Old 07-27-2019, 06:03 AM   #12 (permalink)
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Typically no, but I would evac and pull a deep vacuum on it then refill by weight and make sure you are putting liquid in and not gas.
What do you consider a deep vacuum?(we pulled on it for an hour before we left last night, it had -30 on it when I came this morning, I pulled another 30 minutes then I plan to charge it)

And, wouldn't my ac machine put the freon in the car how it needs to be done?(not trying to be a smartass, Im dumb to ac and trying to learn here)
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Old 07-27-2019, 06:47 AM   #13 (permalink)
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I put 2lb 7oz in. Blowing ice cold. Low side is really high. According to the link above, maybe I f'd up the expansion valve flushing it ?? one pic is system cycling, the other is system off(lower value).


Edit: I was told to close my valves and that made the numbers better.
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Old 07-27-2019, 06:51 AM   #14 (permalink)
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Old 07-27-2019, 06:51 AM   #15 (permalink)
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so, here it is, the answer. Only posting our dumbass trial and error so maybe someone else can benefit from us being stupid.
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Old 07-27-2019, 07:33 AM   #16 (permalink)
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That looks much better.

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Old 07-27-2019, 07:55 AM   #17 (permalink)
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high side seems low? I always heard double outside temp +50
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Old 07-27-2019, 08:06 AM   #18 (permalink)
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Quote:
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What do you consider a deep vacuum?(we pulled on it for an hour before we left last night, it had -30 on it when I came this morning, I pulled another 30 minutes then I plan to charge it)

And, wouldn't my ac machine put the freon in the car how it needs to be done?(not trying to be a smartass, Im dumb to ac and trying to learn here)
That's deeper than deep so you are good there. I like to pull vacuum for 15-20 mins. Then let sit for 15-20 mins to check for leaks and let moisture boil out of the oil/etc, then pull vac for another 15-20. Yea the machine should be pulling liquid unless someone put the bottles in wrong.

I'm Old school as fuck and use no machine. I just do gauges, scale, vacuum pump and occasionally psychrometer and thermocouple to do superheat or subcool.
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Old 07-27-2019, 08:28 AM   #19 (permalink)
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high side seems low? I always heard double outside temp +50
I made it dirt simple. Look at my post and attached chart.
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Old 07-27-2019, 08:48 AM   #20 (permalink)
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high side seems low? I always heard double outside temp +50
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I made it dirt simple. Look at my post and attached chart.
If anything, the low side looks a little low, according to the chart. But it is blowing cold now, so Im going to leave it alone. Thanks for posting that chart, I printed it off for future reference!
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Old 07-27-2019, 09:30 AM   #21 (permalink)
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I made it dirt simple. Look at my post and attached chart.
I don't know how you post a meme, but I would put that black guy on that says "He's right, you know"





On the "deep vacuum", I've said this before, you don't know what you got if your using AC gauges for vacuum. You have to use a micron gauge.

Here you can see an AC gauge reading full vacuum. Note the micron gauge reading 4450 microns.



Here you see the AC gauge still at full vacuum, but the micron gauge is at 1640 microns.



There is a world of differnce between 4450 and 1640 microns, but you wouldn't know it by the AC gauge. A "deep vacuum" would be about 400 microns. Lots of vacuum pumps won't even go that low.

Every time I bring this up, someone says they've been doing this for 30 years and it works. That's great. I'm not saying it won't. I've seen people charge a system with no vacuum and it worked. Just saying, don't fool yourself. If you don't have a micron gauge, you don't know what kind of vacuum you're pulling. AC gauges are not designed to measure vacuum accurately.
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