Question about 1997 Saab 900
I have a 1997 Saab 900 SE, and the radiator fan will not turn on whenever the engine warms up. In fact the temperature gauge only goes up to the midpoint of the gauge. I was wondering if it is an electrical problem or will i need a new radiator
On my slightly older Saab the radiator fan is electric and only is engaged when the temperature meter reaches 3/4 to the top.
When the car is in motion it will not spin since the air flowing through the radiator from the speed is sufficient to maintain normal engine temp. Only when the car is still it for a few minutes it may start to spin especially during summer, it will sometimes continue to spin even after the engine is turned off. This is normal behavior for this car.
To conclude, if your engine temp only goes up to half the gauge there would be no need for the fan to start spinning. If it doesn't engage during the conditions I described above there would be a problem that needs to be fixed.
Posted on May 25, 2009
This is incorrect advice for this year and make of vehicle. If followed could cause major engine damage.
Posted on May 26, 2012
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Posted on Jan 02, 2017
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Physically look in the radiator under the cap when cool, for coolant level, and check the valve in the cap for sticking. If air is present in the radiator it can't get out, and more coolant can't get in,(from the overflow). Either clean the cap or replace it and check that it is the CORRECT cap.
Radiator fins dirty, clean with a strong stream of water, not high pressure water.
Radiator clogged, try backflushing it, or replace.
Thermostat stuck open or shut, replace it.
Water pump worn out, can no longer move enough coolant, replace it.
Fan shroud broken or missing....
Electric Fan(s) not working, Check the fan, relay, fuse and engine temperature sensor's.
Belt driven fan, belt slipping, fan clutch is bad, fan blades have flattened out.
Air dam under front bumper is gone, loose, or broken. It actually has a purpose other than scraping on the driveway or curbs. It forces air up into and thru the condenser and radiator. If it's loose, airflow can actually push it out of place making it useless or blocking the airflow. Along with that, there may also be a plastic piece attached to the bottom of, and wraps up behind the bumper. If it's loose, airflow can actually push it out of place blocking the airflow. Simply reattach it with 4 or 5 screws.
Also, if the vehicle has A/C and electric fans, one fan is dedicated to the A/C and should come on almost the instant the A/C is turned on. The engine fan will run even with the key off, that is normal. The system is trying to cool itself. Hope this helps.
You can simply replace or unplug the sensor. Unplugging it should turn off the warning light and won
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