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Old 08-13-2010, 04:59 PM   #26
txl146
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Quote:
Originally Posted by stikboy9 View Post
So....the compressor is in, pulled vacuum and it held roughly 29 inHg. Getting ready to recharge and am curious if you followed the service manual or just instructions on the back of the can...?? The service manual has some somewhat confusing instructions on charging the High side first (with the car off, of course) until the low side pressure gauge reaches 14 psi, close valve, check for leaks and then continue charging the High pressure side until the Low/High pressure gauges read almost equal....and then move on to the typical instructions of charging the low pressure side.
I just followed instruction on back of can. It was very easy.
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Old 08-13-2010, 05:01 PM   #27
txl146
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Originally Posted by Magnum626 View Post
So I can purchase the later model condenser and it matches up still?
yes, later model condenser should also fit. Make sure to replace drier while you are at it!
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Old 08-13-2010, 06:08 PM   #28
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^Ok, someone at the parts dept wasn't sure if all the lines would still match up with the newer condenser/drier. I haven't had AC for months now and my left arm is way way darker than my right...lol
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Old 08-13-2010, 06:18 PM   #29
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I'm in the process of procuring the tools needed to do my AC. I haven't had AC in about 5 years.

The brand for both parts are US General or the same used by txl146.
$29.99 for the AC-manifold gauge set. It's $49.99 instore, but they will price match the online price if you print it out.
http://www.harborfreight.com/a-c-man...set-92649.html

$79.99 - 20% coupon for the vacuum pump
http://www.harborfreight.com/25-cfm-...ump-98076.html
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Old 08-13-2010, 06:34 PM   #30
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Quote:
Originally Posted by txl146 View Post
I just followed instruction on back of can. It was very easy.
Yep, that's what I ended up doing as well. It's soooooo nice to have A/C again!

Quote:
Originally Posted by illmatic View Post
I'm in the process of procuring the tools needed to do my AC. I haven't had AC in about 5 years.

The brand for both parts are US General or the same used by txl146.
$29.99 for the AC-manifold gauge set. It's $49.99 instore, but they will price match the online price if you print it out.
http://www.harborfreight.com/a-c-man...set-92649.html

$79.99 - 20% coupon for the vacuum pump
http://www.harborfreight.com/25-cfm-...ump-98076.html
Just an fyi, autozone will let you borrow a vacuum. It's a $199 refundable deposit though. I was going to order one from HF, but I dont think I'd use it enough to justify the expense.
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Old 08-13-2010, 08:02 PM   #31
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Great to see that you guys have working AC again.

Just do it yourself and save hundreds of dollars!
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Old 03-17-2011, 11:47 AM   #32
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I just went through the process of replacing the expansion valve. Everything was going great, except the car won't take a charge. The vaccum held after an hour with the pump on, but the car won't take any refrigerant. I've been shaking the can and it only gets to the gauges and none of it will go into the low pressure side.

Is there a trick to get it going? Am I missing something?
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Old 03-17-2011, 11:58 AM   #33
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Sure there is no valve on the quick disconnect for the low pressure hose?

With the engine off does it flow into a vacuum from the high side?
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Old 03-17-2011, 12:18 PM   #34
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There is a valve on the quick disconnect, but I made sure it was open. I guess I can double check to make sure the connection is good.

When I ran the vacuum pump, I ran it with both the high and low sides open, and both gauges showed a vacuum.

I was following the Subaru instructions to do the high side with the engine off first and it did take a bit of refrigerant on the high side.
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Old 03-17-2011, 01:53 PM   #35
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Quote:
Originally Posted by Hah72215 View Post
I was following the Subaru instructions to do the high side with the engine off first and it did take a bit of refrigerant on the high side.

So the prolem is the compressor is not running?
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Old 03-17-2011, 02:49 PM   #36
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Yeah, I don't think it is. Does it have to be running in order for the system to take refrigerant?
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Old 03-17-2011, 03:05 PM   #37
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Yes

The low pressure switch should turn it on at about 42 psig. Is the temperature above 45 deg F?
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Old 03-17-2011, 03:13 PM   #38
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Yes, it's about 80 degrees F here in Arizona. So it should have automatically come on then?
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Old 03-17-2011, 03:23 PM   #39
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Time to start electrical troubleshooting. Make sure the switch is on(the one with the green light).
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Old 03-17-2011, 03:32 PM   #40
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I'm assuming there is a fuse for this, and I'll check that first. But besides that, is there a way of getting it going?

Thanks for the help so far, by the way.
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Old 03-18-2011, 01:41 AM   #41
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OK, so I just tried again. The connections are good and everything seems to be hooked up correctly, but the compressor still won't engage. I checked the fuses and they looked good too.

Is there a way to jump the compressor somehow? Would that help? Or is my compressor done?

It seems like some refrigerant did get in, but the low pressure gauge is reading really high, over 80 psi.

Any advice would be appreciated.
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Old 03-18-2011, 02:26 AM   #42
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EPA 609 cert? (I'm well versed with none MVAC HVAC so take my post with a grain of salt regarding MVAC)

Since the system is small charging with vapor won't take long and it will help ensure that you do not get any liquid into the compressor which is a major no-no. Also break the vacuum with some refrigerant before turning on the system since its not a good idea to run some compressors in a vacuum. One question though do you have to evacuate down to 500 microns on MVAC, its required in building systems but not sure about cars.

Last edited by UAL912; 03-18-2011 at 02:44 AM.
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Old 03-18-2011, 12:39 PM   #43
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That sounds about right 85 psig would be about 80 deg. It should come on. Was it running before you changed the expansion valve?

You could apply 12 volts directly to the compressor but that won't tell you much. It could also be the evaporator thermal switch (did you mess with that?) the pressure switch or the thermal protector on the compressor (if you have one). All those turn on a relay. Do you have the wiring diagram and a meter?


The guys that run this forum are in Phoenix, is that close to Tempe?
http://www.autoacforum.com/categories.cfm?catid=2
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Old 03-18-2011, 01:56 PM   #44
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Don't forget there's a certain ratio of compressor oil:refrigerant.

Depending on which parts are replaced, you may need to add some compressor oil, and conversely, if you've just fixed a leaky o-ring and the correct amount of oil is already in the system, you won't want to add any more.

Just my 2cents, but nice write-up!

Last edited by z; 03-18-2011 at 11:49 PM.
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Old 03-18-2011, 02:18 PM   #45
Hah72215
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It was running last time I tried it before I changed the expansion valve. I've got the Subaru diagram, I guess I'll try and get familiar with using a meter to test all of this.

I haven't messed with the thermal switch or the pressure switch. Maybe I'll see if jumping the pressure switch does the trick.

Then I guess I'll see if they are faulty.
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Old 03-18-2011, 11:50 PM   #46
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Quote:
Originally Posted by z View Post
Don't forget there's a certain ratio of compressor oil:refrigerant.

Depending on which parts are replaced, you may need to add some compressor oil, and conversely, if you've just fixed a leaky o-ring and the correct amount of oil is already in the system, you won't want to add any more.

Just my 2cents, but nice write-up!

iirc, a new compressor ships with the appropriate amount of oil in it.
These other parts, add compressor oil as follows:
(This is from the '04 STi manual but I imagine it carries across some years and models.

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Old 03-19-2011, 12:12 PM   #47
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Nice write up on the AC system. I have a few questions. I'm in the same boat. I have cold air sometimes right when the system comes on, but almost without fail it will go to non-cool air(warm) within 2 or 3 minutes top. I was thinking of just punting and replacing everything. There are no leaks as it was tested for that already. So is replacing condenser, compressor, and expansion valve in one whack too much? Or should I start small? Reason I ask is because I have the manifold off, radiator out, and AC compressor dangling right now. I was doing the fuel hose replacement and replacing the radiator(leaky at the crimps/plastic).

If I do this - do you have to do anything special before disconnecting the AC lines? Or can you just take the lines off and replace the compressor, condenser, and expansion valve? Also do you have a part number for the O rings?

This is for a 2002 WRX.
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Old 03-20-2011, 11:22 PM   #48
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Quote:
Originally Posted by tcarter
Nice write up on the AC system. I have a few questions. I'm in the same boat. I have cold air sometimes right when the system comes on, but almost without fail it will go to non-cool air(warm) within 2 or 3 minutes top. I was thinking of just punting and replacing everything. There are no leaks as it was tested for that already. So is replacing condenser, compressor, and expansion valve in one whack too much? Or should I start small? Reason I ask is because I have the manifold off, radiator out, and AC compressor dangling right now. I was doing the fuel hose replacement and replacing the radiator(leaky at the crimps/plastic).

If I do this - do you have to do anything special before disconnecting the AC lines? Or can you just take the lines off and replace the compressor, condenser, and expansion valve? Also do you have a part number for the O rings?

This is for a 2002 WRX.
You have to have the system at least evacuated as it is unlawful to vent refrigerant to the atmosphere.

If you have to ask you probably should'nt touch the system. Sounds like you are just undercharged though. Take it to a shop and have them evacuate and pull the system into a vacuum to boil of the moisture, and leak test. If it can hold 30" of vacuum it should hold refrigerant. If this is the case, you should be okay with a recharge as long as the system is otherwise working properly.
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Old 03-21-2011, 09:32 AM   #49
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Well just b/c I don't know anything about the AC refrigerant doesn't mean I'm a complete tard. I asked b/c I have the manifold off/compressor/alt/power steering pump hanging off and the radiator out. That is why I wanted to rip the mess out and replace it.

Basically I can't do crap with it as is. I have already had it recharged with the same result. So it sounds like I have to put the car back together and then have the system purged and then start over. I'm not going to fight the radiator to get the condenser out. So I will just live with no AC for longer. No biggy. I'll just have the system evacuated and take the mess out whenever I feel like it and then take it to get the system recharged again.

I'm just not the type to let other people work on my car. I'd rather learn what to do and do it myself. I have zero trust in other people being as careful as I would be on my own car.

I might even just live with no AC and just rip the mess out after the junk is out of the lines. I haven't had AC in 3 or 4 years now. Why start this year haha.
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Old 03-21-2011, 03:08 PM   #50
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Quote:
Originally Posted by tcarter
Well just b/c I don't know anything about the AC refrigerant doesn't mean I'm a complete tard. I asked b/c I have the manifold off/compressor/alt/power steering pump hanging off and the radiator out. That is why I wanted to rip the mess out and replace it.

Basically I can't do crap with it as is. I have already had it recharged with the same result. So it sounds like I have to put the car back together and then have the system purged and then start over. I'm not going to fight the radiator to get the condenser out. So I will just live with no AC for longer. No biggy. I'll just have the system evacuated and take the mess out whenever I feel like it and then take it to get the system recharged again.

I'm just not the type to let other people work on my car. I'd rather learn what to do and do it myself. I have zero trust in other people being as careful as I would be on my own car.

I might even just live with no AC and just rip the mess out after the junk is out of the lines. I haven't had AC in 3 or 4 years now. Why start this year haha.
Never said you were a tard. Just clarifying that the system is more dangerous than it seems, and that its unlawful to vent the refrigerant to the atmosphere.

If you do the replacement do not attempt to turn the system on before its had the proper amount of PAG oil put back into the system, otherwise you will fry the compressor. Some new units contain PAG oil some don't, I have seen it both ways.

Make sure you get new seals and dip them in PAG oil prior to installation, and make sure ALL bolts are torqued to spec.

The A/C system is one of the things on a car that you absolutely should not touch, unless you are Section 609 certified, and have the proper equipment to service it.
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