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]
[Main 9000 Bulletin Board | BBFAQ |
Prev by Date | Next by Date | Post Followup ]
Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
Re: Possible overcharge?
Posted by Robert Kaplan (more from Robert Kaplan) on Fri, 2 Aug 2002 09:19:33
In Reply to: Possible overcharge?, KeithR, Fri, 2 Aug 2002 08:50:52
Members do not see ads below this line. - Help Keep This Site Online - Signup
Having thought about this some more, I now recall my 93CS with the Seiko compressor doing the same thing on two occasions when it was overcharged.
My first thought about this post was overcharge also. I initially discarded this thought, though, because an overcharge should not trip the pressure switch while cruising since the airflow will keep high side low. But that's pressure, not heat.
I have noticed on my 93 with the Seiko compressor that an overcharge will produce a mysterious absence of cold air after the system has been running for about the same amount of time that this guy is reporting. The compressor shuts down and I suspect the thermal switch in the compressor. There is definitely 12v going to the compressor, but no spin from the clutch. The wire to the compressor goes into the compressor body and comes out a different color, which I understand to be thermal protection for the compressor.
Dropping the charge down to 2.8 times ambient will prevent this condition. I don't understand why an overcharge will produce a thermal overload when the car is moving. But, I can say for certain that it has happened to me. I wonder if it is something to do with the design of the rotary vane compressor. The Sanden's don't even have thermal protection.
So, Michael, here is what you do. Convert the ambient temperature to degrees F. Then multiply that number by 2.8. The resulting number is the high side pressure (in psi) you want to see after the system has stabilized at 1500 rpms with the doors and windows open. I believe that one bar is 14.5 psi, or something like that.
posted by 64.91.162...
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.
StateOfNine.com
![](/tsn/xyz/stateofninebutton.gif) |
SaabClub.com
![](/tsn/xyz/scnabutton.gif) |
Jak Stoll Performance
![](/tsn/xyz/jakstollbutton.gif) |
M Car Covers
![](/tsn/xyz/mcarcoversbutton.gif) |
Ad Available
![](/tsn/xyz/buttonavailable.gif) |
![](/tsn/images/tsnmap.gif)
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!