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Old 05-15-2013, 06:03 PM   #1
goose737700
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Default Lo Idle AC mystery solved.

Like many here I have had a problem with my AC dieing off at every stop sign, stop light etc.. 85-90 degree air coming out of the vents every stop light. I sought out a AC guru at work and we connected a manifold gauge set to the system and we were going to do a service. Because of the pressures we were seeing he recommended, against it. (I can't remember exact figures but I remember the low side was bouncing around which didn't seem right.) So we lived with it because if you were above 1500 RPM it works great.
About a month ago when my vw golf AC packed up, and I was looking for compressors I stumbled on a Nugget of information that will be very interesting to this forum. It seems that the answer to my prayers was a $30 scroll control valve, or rcv, that is a bolt on fix for our saturns. So when I ordered my compressor for my Golf, i added this to the order.

sorry it wouldn't let me attach the URL just google acpartshouse and look for the scroll compressor control valve


I was sceptical but since there are so many of us vue owners posting about this specific problem I thought it was worth a shot. BTW it is getting to the 100's here already. So today I had the system recovered, loosened up the compressor (it was still in the car but I had to rotate it to get at the cover plate), pulled out the old one popped in the new one and put it all back together. vacuumed the system and checked for leaks, none. And serviced it up. Voila it works fantastically. Total cost $57 for the part and 3 cans of R134. I hope this helps some of the people out there.
Jay

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Old 05-15-2013, 06:39 PM   #2
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Default Re: Lo Idle AC mystery solved.

Looks like this is the item.
it is only listed for a V6, not 4 cylinder.

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Old 05-15-2013, 07:40 PM   #3
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Default Re: Lo Idle AC mystery solved.

Yep that's the one, thanks for posting.

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Old 05-21-2013, 10:18 PM   #4
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Default Re: Lo Idle AC mystery solved.

No kidding?? That little valve? I have been suffering for 2 years with the low idle low ac cooling situation. I keep getting this weak compressor BS. No signs of leakage. Makes no sense.

I am just curious if I should take a chance on this valve and see what happens.

Strongly recommend do you?

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Old 05-23-2013, 12:43 PM   #5
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Default Re: Lo Idle AC mystery solved.

Absolutely, The worst thing about this job is getting the compressor bolts out, you don't even have to remove the unit from the car. However, make sure you have the proper a/c tools before you start, or have a shop vac and re-service for you. like I said in the post I was able to get this done for less than $60 and I'm all about the good cheap fix. 7 days now and the thing is working great.
good luck

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Old 05-23-2013, 01:09 PM   #6
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Default Re: Lo Idle AC mystery solved.

Quote:
Originally Posted by goose737700 View Post
Absolutely, The worst thing about this job is getting the compressor bolts out, you don't even have to remove the unit from the car. However, make sure you have the proper a/c tools before you start, or have a shop vac and re-service for you. like I said in the post I was able to get this done for less than $60 and I'm all about the good cheap fix. 7 days now and the thing is working great.
good luck
goose ... I'm guessing you removed the diamond shaped cover to get at the valve ... was the old one simple to remove when cover was off?

Also, did you use a new gasket or seal when the cover was put back on?

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Old 05-23-2013, 02:04 PM   #7
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Default Re: Lo Idle AC mystery solved.

yes it's the small cover held on by 2 10mm bolts, the valve comes with a new gasket and o ring for the valve itself. the valve is backed up with a spring so it follows the plate as you loosen it up.

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Old 05-23-2013, 02:13 PM   #8
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Default Re: Lo Idle AC mystery solved.

Quote:
Originally Posted by goose737700 View Post
yes it's the small cover held on by 2 10mm bolts, the valve comes with a new gasket and o ring for the valve itself. the valve is backed up with a spring so it follows the plate as you loosen it up.
You probably realize you're dangerously close to being voted "member of the year" right?

You also could be "enemy of the year" as decided by AC compressor retailers - if this works out.

I have a valve on order - I've messed with my youngest daughters 2007 3.5 AC for several weeks now and was just getting ready to pull trigger for new compressor.

My fingers are crossed.

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Old 05-23-2013, 02:34 PM   #9
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Default Re: Lo Idle AC mystery solved.

lol, I hope it solves your problem, if you had the same problems as me it may just be the ticket. It's infuriating that these cars have so many inherent flaws, my vw golf went 265K before the compressor gave it up. my vue has less than 41k and I really don't know how long this has been an issue, at least as long as I have owned it (25k).

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Old 05-24-2013, 01:47 PM   #10
tomster
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Default Re: Lo Idle AC mystery solved.

I have a leak somewhere on my compressor but only 65K miles. I wonder if
this could the problem. A little plate on the back side of the compressor with two bolts holding it on. I have a 4 cyl, 07.

...
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Old 05-24-2013, 03:46 PM   #11
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Default Re: Lo Idle AC mystery solved.

was there anything obviously differant/wrong with the valve you removed as compared to the new one? i have the same issue and might just go this route.

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Old 05-24-2013, 06:51 PM   #12
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Default Re: Lo Idle AC mystery solved.

They appear to be very similar, the old one was tarnished a little, and showed signs wear on one side. I suspect the failure was inside as the orifices are quite small. I noticed that the new valve is adjustable with an allen key and the original is not and is peened in place. Give it a shot I am all smiles now driving around in the heat. As far as a fix for low refrigerant I can't comment on if this would be a fix or not.
Good luck
Jay

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Old 05-25-2013, 05:29 PM   #13
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Default Re: Lo Idle AC mystery solved.

Quote:
Originally Posted by goose737700 View Post
They appear to be very similar, the old one was tarnished a little, and showed signs wear on one side. I suspect the failure was inside as the orifices are quite small. I noticed that the new valve is adjustable with an allen key and the original is not and is peened in place. Give it a shot I am all smiles now driving around in the heat. As far as a fix for low refrigerant I can't comment on if this would be a fix or not.
Good luck
Jay
Jay - I'm one step closer to the grand experiment as FedEx just dropped off the valve I ordered. The candidate Vue is out of town for a few day but I'm eager to get started.

The scroll valve was in a small plastic baggy with a coil spring, an oddly shaped gasket and one other small plastic piece I can't identify.

Does this stuff look familiar?

BTW ... according to vendor website the same valve is used on a few Ford automobiles (500, Freestyle, etc) and I found this youtube video ... it appears the Ford AC compressor might not be as cramped as the Vue.

http://www.youtube.com/watch?v=FKr7o7vkdY8
Attached Images
File Type: jpg Pix Scroll Valve.jpg (76.7 KB, 250 views)

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Old 05-26-2013, 10:13 PM   #14
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Default Re: Lo Idle AC mystery solved.

mine only included the valve and gasket, the spring is a bonus i suppose, as that looks to be the one the valve rides on in the compressor. Not sure about the filter, but it might be worth replacing of it is convenient.

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Old 05-28-2013, 07:39 PM   #15
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Default Re: Lo Idle AC mystery solved.

I have received the new part as you suggested. Just about time to put it on. Man I hope this solves the issue. I am with grumpy...You will be member of the decade!

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Old 05-29-2013, 09:57 PM   #16
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Default Re: Lo Idle AC mystery solved.

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I have received the new part as you suggested. Just about time to put it on. Man I hope this solves the issue. I am with grumpy...You will be member of the decade!
I installed my new valve this afternoon. Got the AC system resealed and pulled vacuum for a couple of hours. Will recheck in the AM, and if no leaks, will shoot R-134A to the little guy.

Changing the valve was very doable - even for an old coot like me (71).

I have a few photos, and made a lists of suggested steps, and will share with anyone who wants to get up to speed on my method of changing the valve.

A reminder - at this point I don't know if results will make it worth the effort. However, I've read several encouraging posts by others who've improved the low RPM operation of the Visteon SC100V compressor (widely used other than 04-07 Vue).

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Old 05-30-2013, 02:01 PM   #17
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Default Re: Lo Idle AC mystery solved.

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A reminder - at this point I don't know if results will make it worth the effort. However, I've read several encouraging posts by others who've improved the low RPM operation of the Visteon SC100V compressor (widely used other than 04-07 Vue).
So - its now official - goose737700 is my hero and BFF for posting his results after changing the "scroll valve".

My overnight leak test was good so I filled with R134a (28 oz) and there is a huge difference in cooling at idle (07 Vue - 3.5 with 107,000 miles).

I go by the GM AC performance table and discharge air temperature from center upper left vent before valve change was 66F it now registers 48F
and the GM max temp for this reading is 55F.

This is after 5 minutes of operation - with engine at 722 RPM, all doors closed, drivers window down 5 inches, blower set to high, AC and RECIRC switches ON and temp switch to MAX cold.

The chart has different value for outside air temp and humidity and those were essentially the same for both tests.

This silly thing may blow up tomorrow but the new hardware looks first class and with luck will see my daughter through this summer.

I have a few notes and photo's ... PM email address if you'd like to see.

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Old 05-30-2013, 02:28 PM   #18
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Default Re: Lo Idle AC mystery solved.

Great, that you fixed it I mean. I was hoping that it wasn't a fluke. Lets hope that everyone has this level of success as well.

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Old 05-30-2013, 02:33 PM   #19
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Default Re: Lo Idle AC mystery solved.

is the A/C pump same on 2.2 and 3.5 engines or is this a problem only associated with the 3.6 engine?

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Old 05-30-2013, 03:10 PM   #20
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Default Re: Lo Idle AC mystery solved.

We are talking about the compressor installed on the 3.5l engine, the others are not interchangeable. So if you have a 2.2l and are experiencing similar problems this fix will probably not work for you.

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