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Re: Fan Thermoswitch
Posted by David Prantl - http://saabnet.com/tsn/forms/e.php3 (more from David Prantl - http://saabnet.com/tsn/forms/e.php3) on Wed, 19 Feb 2003 21:55:04
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

>  the temperature gauge does get up in the top quarter of the
>  gauge if I'm in heavy traffic, before the fan kicks in

>  Seems to me if the engineers at Saab felt that was an appropriate
>  temperature at which to turn on the fan, who am I to argue ?

That is sound reasoning, but those same engineers had certain priorities to 
work with at the time they designed your car's cooling system.  It's likely 
that perfect health after age 12 wasn't terribly high on their list.

>  Anyone reading this hear of swapping a perfectly good  thermoswitch with 
>one that switches on at a lower temperature ?

Sure.  I strive to do this it in every single SAAB I own.

>  Anyone think that doing so would be an important  contribution to the 
>health of the engine?

Yes.  The cooler thermoswitch in question does everything equally well like 
the original (12-year-old) switch, except it reduces the magnitude of the 
temp change experienced by your engine while sitting in traffic (with the 
a/c turned off).  Instead of climbing to 11 o'clock or higher on the temp 
gauge, the new switch kicks on the fans at 10 o'clock or less.  A smaller 
temp swing means less head gasket stress, and that's always a good thing !

Another thing to consider is how much longer is that original switch going 
to remain perfectly good.  It's eventual failure could very quickly and 
easily put your motor out of commission.

Lastly, a new switch (with guaranteed-better performance than the old one) 
costs a measly six bucks, and adds two minutes of work to a cooling service 
job that already includes draining the coolant for other reasons.

David Prantl
david_prantlno39sdcx6spamx782hotmail.com
'84 900S, 5M, 210kMi, RIP as of 2/98
'89 900, 3A, 116kMi, restored and SOLD on 3/24/01
'97 9000CSET, 5M, 63kMi, Speedparts Stage-I, SOLD on 10/11/02
'86 9000T, 5M, 200kMi
'88 9000S, 5M, 142kMi
'90 9000S (B202I), 4A, 150kMi
'93 9000CSET, 5M, 82kMi
'94 9000CSE, 4A, 153kMi
'68 97 Sonett V4, 4M, 76kMi, #000467

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