Cooling Fan Failure Question (long) - Saab 900 Bulletin Board - Saabnet.com
NG900 & OG93 |
Vintage Models |
Clubs & SOC |
Other Cars |
Member Photo Galleries |
Member Directory |
*Buddy Registry |
*Mileage Registry |
What's New |
Photo of the Month |
Both my a/c fan (driver's side) and cooling fan (passenger's side) gave up the ghost within a few days of each other.
I've searched here for information regarding the typical cooling fan failure modes, and I understand that as they age, the bearings dry out and wear, eventually resulting in seized fan motors. Maybe that's what happened here, but bear with me as I explain the circumstances of the failure.
I noticed that my temperature gauge was reading higher than normal (usually runs 20 past the hour) when sitting in traffic with the a/c on. Never mind the fact that it's been as hot as homemade sin in the Baltimore metro area this week. Yesterday, I was driving to Annapolis, MD from Harrisburg, PA, and noticed that the temp was edging up even with the a/c off. I recently did a headgasket job so I've been hyper-vigilant about engine temperature.
Maybe it was a coincidence, but on a couple long descents on I-83 I caught a strong smell I usually associate with overcooked brake pads, and my foot wasn't near the brake pedal.
You can see from the photos in my gallery that both the fan blade hubs were "wallowed out." The a/c fan blade assembly was just sitting loose in its frame, while the cooling fan was completely seized - see the motor with the melted material around the shaft and clip. Maybe the brake pad stink was the bearings melting the fan motor housing, but why on a descent? I can't rotate the a/c motor by hand, but it will spin and sound like box of rocks when I hook it to a 12v power source.
Fan Blades http://www.saabnet.com/tsn/members/photos/2290/31665.jpg
Cooling Fan Motor
A/C Fan Motor
Prior to the fan failures, I noticed heavy RPM drops as the alternator picked up the load when either fan switched on. The car came close to stalling and actually did stall on a few occasions. I chalked this up to aged leads from the battery and alternator that are on my list to replace.
To sum up, I've ordered the appropriate used replacement cooling fans. My question is whether or not the failure I experienced is typical given they are 25 years old? A follow up question is whether this is indicative of reduced radiator cooling efficiency (should I replace the radiator when I'm in there with the fans).
Car is a 1993 Turbo with 188,000 miles.
Thanks in advance for your advice!
->Posting last edited on Thu, 5 Jul 2018 15:48:45.
Posts in this Thread:
- Cooling Fan Failure Question (long), OldLinePaul , Thu, 5 Jul 2018 15:42:03 <-- Viewing This Message
- Re: Cooling Fan Failure Question (long), StoicBlue87 , Thu, 5 Jul 2018 21:24:00
- Re: Cooling Fan Failure Question (long), ZAAB , Fri, 6 Jul 2018 05:23:21
- x2, Justin VanAbrahams , Fri, 6 Jul 2018 09:33:21
- Re: x2, Landjet , Sun, 8 Jul 2018 19:58:59
- Re: x2, Justin VanAbrahams , Mon, 9 Jul 2018 15:37:58
- Re: x2, Landjet , Mon, 9 Jul 2018 15:44:29
- Re: x2, Justin VanAbrahams , Tue, 10 Jul 2018 09:14:59
- Thanks!, OldLinePaul , Fri, 6 Jul 2018 17:18:56
- Uro, Justin VanAbrahams , Fri, 6 Jul 2018 20:06:46
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.
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 -
Your address is: 22.214.171.124 - Using CCBot/2.0 (https://commoncrawl.org/faq/) - Logged.
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!