[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: Townsend, thermo. sw. recommendation??? Like This Post: - Subscribe to Daily Digest for this Bulletin Board Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Tue, 15 Mar 2005 11:30:48 In Reply to: Townsend, thermo. sw. recommendation???, Tom, Mon, 14 Mar 2005 11:03:54 Alert me when someone posts in this thread: Members do not see ads below this line. - Help Keep This Site Online - Signup

The 82C thermostat opens at 82C. The 82C fan switch comes on at 82C. It really does work together.

When the engine is cold, the coolant in the radiator is colder than 82C. As the engine warms up, the thermostat opens, and sends out hot coolant. This is replaced by cool coolant from the radiator, so the thermostat closes again. So the thermostat opens and closes, or more likely is cracked open, around 82C.
If there is airflow over the radiator, it is running cooler than 82C. Warm coolant flows in, but it rapidly loses heat to the air flowing over the radiator. After all, that's what radiators do. If you'll notice, the fan switch is far away from the inlet hose.

Now, if there is no airflow over the radiator - say, sitting in traffic - the heat in the radiator builds up. If it builds up enough, then the fan comes on and provides the airflow that driving around usually provides. The radiator cools off.

So if you have an 82C thermostat and an 82C fan, the fan runs a little more, but basically it comes on a little sooner if you're sitting in traffic. And that's a good thing. The part you forgot was that the coolant is cooled by the radiator, and the fan swich is on the side farthest from the input hose. So it sees the coolest fluid in the system.

posted by 192.249....

• Townsend, thermo. sw. recommendation???, Tom, Mon, 14 Mar 2005 11:03:54
  • Re: Townsend, thermo. sw. recommendation???, Ari , Tue, 15 Mar 2005 11:30:48 <-- Viewing This Message
  • I run both 82°C, GregR, Mon, 14 Mar 2005 12:56:58
    • Re: I run both 82°C in mine too, Inga , Tue, 15 Mar 2005 06:11:54
      • Re: I run both 82°C in mine too, tom, Tue, 15 Mar 2005 15:41:47
  • Re: Townsend, thermo. sw. recommendation???, Andy , Mon, 14 Mar 2005 12:33:39

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.

• Prev by Date: Re: Crank pulley ? Pulley supplier, Inga, Tue, 15 Mar 2005 11:26:03
• Next by Date: Re: bouncing? idle, RS, Tue, 15 Mar 2005 11:40:20
• Main C900 Bulletin Board

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)