The banner above is an advertisment - if it asks you to download software, please ignore.
Site News - 7/1: Members: Log In to See Fewer Ads! | 5/28: SAAB Evolutions/TSN T-Shirts $14
[General | Members | C900 | 9000 | NG900 & OG93 | 93 | 95 | NG95 | 99 | Sonett | Vintage Models | Clubs | Other Cars | FAQs | Gifts | Member Photo Galleries | Member Directory | Classifieds | Manuals | *Buddy Registry | *Mileage Registry | Polls | What's New | Raffle | Photo of the Month | Sponsors]

C900 Bulletin Board
1979-1993 & 94 Conv [Subscribe to Daily Digest]
(Search Author's Posts: e.g. Keyword:username)*Members Only

[Main C900 Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Can you prove/test an AC expansion valve?
Like This Post: - Subscribe to Daily Digest for this Bulletin Board
Posted by StoicBlue87 [Email] (#1829) [Profile/Gallery] (more from StoicBlue87) on Sat, 7 Sep 2024 15:03:13 Share Post by Email
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup

I'm trying to resurrect the AC system on my 92 900s.

Everything that's new:
compressor, hoses, condenser, receiver/dryer, expansion valve.

The system holds a vacuum but upon charging, the pressure readings aren't great; 104psi on the low side and around 190 on the high side. My reference chart indicates these numbers should be around 55 on the low and 300 on the high; my low side is too high and my high side is too low.

The system barely sucks in any refrigerant (r134) and seems to settle out with about .3 lbs. drawn in before stopping any further ingestion.

I've been going through charts and guides and it seems that one likely item is my expansion valve; in my case the valve is stuck open and thus not allowing the refrigerant to change from a liquid to a gas around the evaporator area. I see mentions of people having problems with the valve in these archives and it seems to be simply outright replaced. Some people describe blowing/cleaning them out and I've performed the equivalent with no signs of debris or blockage.

But is there a way to prove that a valve is truly bad?

I have a practically-new spare valve for comparison and both allow me to blow through them with minimal effort when they're at room temperature.

I read that if you place the valves in the freezer for a couple of hours, they'll adjust to closed and block any air when doing the blow test. So far, this test isn't producing a blocked effect.

Is this a valid test? Are there any other things I could check? I'm suspicious of my own impression because both of my valves are new.

The only other thing that might have been causing a problem was a slight over-fill in oil; I opened and drained the compressor of about 1.5 fluid oil ounces...I think the correct amount is 5 oz. and I had dumped in a little more than 6. Maybe the oil was causing the charge issue but...I don't consider myself an AC expert in any way.

Opinions welcome; thanks.



->Posting last edited on Sat, 7 Sep 2024 15:50:58.
Posts in this Thread:
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup
Post a Followup

No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.

Name: Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
E-Mail: (Optional)
Re-Enter E-Mail: (Confidential & Secure - Not revealed to other users!)
Note: Please check your spam folder for BB responses.

Subject:

Posting rules are simple - No for sale/wanted ads may be posted here - use the site classifieds.
You may not cross-post your message to multiple BBs.
Not permitted: political/religious topics and being disrespectful (personal attacks, insults, etc...).
 Site Members do not see any red text, inline ad links, bottom of page anchor ads, box ads, or anti-spam check.

Message: (please no for sale/wanted classifieds - post those in the Saabnet.com Classifieds)
Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).

Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post above, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).
Optional Link: (e.g. http://www.saabnet.com/)
Link Title: (Optional)
Optional Photo/Image Link: (e.g. http://www.saabnet.com/img.jpg)
Photo/Image to Upload: (Please be patient while file uploads)



StateOfNine.com
SaabClub.com
Jak Stoll Performance
M Car Covers
Ad Available

The content on this site may not be republished without permission. Copyright © 1988-2024 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]

Random Saabnet.com Member Gallery Photos (Click Image)
This is a moderated bulletin board - Posting is a privilege, not a right. Unsolicited commercial postings are not allowed (no spam). Please, no For Sale or Wanted postings, SERIOUSLY. Classifieds are to be listed in The Saab Network Classifieds pages. This is a problem solving forum for over 250,000 Saab owners, so expect to see problems discussed here even though our cars are generally very reliable. This is not an anything goes type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the Saabnet.com Mission and Purpose Page. Please remember that you are not anonymous. Site Contact | Site Donations | Other Sites by SP - Poverty2Prosperity.org | Run Club Menlo Park | ScreenBot


Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all the Site Membership Benefits!