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Service bulletin Posted by Ari [Email] ![]() ![]() In Reply to: radiator fan on 10 mins after turning off car, n8, Tue, 30 May 2006 13:47:22 Members do not see ads below this line. - Help Keep This Site Online - Signup |
The fan relay is designed to run for 10 minutes after the engine shuts off, if the radiator is hot. A battery in decent condition should be able to drive a fan for 10 minutes.
If it's running more than 10 minutes, that is a relay problem.
It was enough of an issue that Saab decided to discontinue the use of a time delay relay, and just have the fan shut off when the car shuts off. Not too bad an idea. After all, the coolant isn't circulating with the water pump not running, so all you are doing is cooling off the radiator.
The 'fix' was to replace the relay with a non-time-delay (aka 'normal') relay. In your '91, you can just plug it in; older cars needed some rewiring.
Check out the Saab Service Bulletin at Townsend's site:
http://townsendimports.com/Web/cooling_system_folder/radfandelrelbull.htm
posted by 12.42.121...
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