USE CODE: D9TG9ZYX - This Amazon Pick is Recommended by Saabnet.com!
Site News - 7/11: No New News Today | 5/10: Members: Log In to See Fewer Ads!
[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
Re: components and NOT, long
Like This Post: - Subscribe to Daily Digest for this Bulletin Board
Posted by Saana88 [Email] (#207) [Profile/Gallery] (more from Saana88) on Thu, 10 May 2007 19:47:28 Share Post by Email
In Reply to: Normal coolant temp in '93 TC ???, Joe98, Thu, 10 May 2007 13:06:48
Alert me when someone posts in this thread:
Members do not see ads below this line. - Help Keep This Site Online - Signup

If your thermostat is really set to open at the same temperature as your thermoswitch tells the fans to kick on, they're probably going to turn on all the time. If I remember right, an 82 degree thermostat would go well with an 87 degree thermoswitch, so between 82 and 87 degrees the thermostat opens up and regulates the amount of coolant going through the radiator. That way, the rad can cool the coolant like it should. Then, if you go over 87 degrees, the switch will close and kick the fans on (fans, plural, because you have a '93 turbo) for the backup cooling system.
Halfway is pretty normal, though the gauges (sic) on 900s are a little hyperactive. They tend to indicate changes in temperature a little too much.
'88 900, old setup (junk radiator, 87 degree thermostat, 92 degree thermoswitch): NOT was over half on the gauge, fans didn't kick in until two thirds, where it would reside for a good portion of the summer.
'88 900, new setup (good radiator, 82 degree thermostat, 87 degree thermoswitch): NOT is around a third of the way up on the gauge, and the fans kick on just over half.
'92 900 S, factory setup (leaky radiator, 89 degree thermostat, 92 degree thermoswitch, only one cooling fan triggered by the thermoswitch): NOT is halfway, fans kick on at two thirds

If your cooling fans are always on when the key is in the run position (AC OFF!) then the cooling fan relay may have failed, keeping them on permanently, or you have a short between the wires for the thermoswitch, or you have a faulty thermoswitch. I recommend the 82 degree thermostat (standard for turbos and optional for warm weather on nonturbos IIRC) and an 87 degree thermoswitch. (50% concentration of coolant) I have the Saab blue coolant in the '88 and it's niiiice. With this setup, NOT should be between a third and halfway on the gauge, then the fans will kick on at halfway. If you've gone from high exertion or high speed driving in the summer to a condition where there suddenly isn't any air flowing across the radiator (like pulling up to a toll booth) then the temperature may spike a little over half, but the fans should keep it in check.
I change the gauge sender (it takes ten minutes and costs five bucks) every 120k or so, just for peace of mind.
If you want to take the spike out of your cooling system like I have, since my AC is gone, all you have to do is disconnect the power to the AC compressor (if it's still in there) and jump together two wires and your AC snowflake button will trigger the cooling fan. I use this in the tollbooth scenario and in traffic jams.

Also, what temperature was it outside when you did that test? If you're idling a hot (temperature-wise, we all know how they look!) car without going anywhere, the fans will probably have to work to keep the temp down. They should stay on whenever the thermoswitch tells them to and then a little while longer. You see, the cooling fan relay incorporates a delay into its circuitry. The thermoswitch closes, the relay turns the fans on, and the temperature starts to drop. When it gets cool enough inside the radiator, the thermoswitch will open again, but the fan relay should hold the fans on for a little while longer (20 seconds up to ten minutes) so the time between cycles is a little longer.
The relay died in my '88, but only the time delay function. The thermoswitch still kicked the fans on, but they'd only stay on for ten seconds, then they would turn off. Then, fifteen seconds later, they'd turn on again as the temperature in the radiator oscillated wildly.
The cooling fan relay can hold the fans on for up to ten minutes, even after you switch off the ignition. Also, the fans can kick on after you have switched the car off since the "hot soak" period is also a spike time. Since the car isn't moving anywhere (you've parked it) there isn't a whole lot of air going across the radiator, so it can't work efficiently. Also, when you switch the car off, the water pump stops circulating cooled-off coolant back through your engine, so naturally the temperature is going to jump a little. Don't hiss back if your car decides to kick on its cooling fans as you are walking away. That's actually a good thing!

Whew! My fingers are tired. I hope this helps, and if it doesn't, just post again in this thread.
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 © 1988-2025 - 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!