Question about 1997 Saab 900

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Radiator fan won't kick in

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

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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

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  • Håkan Sterner May 29, 2009

    How is it going for you, OP? Does my answer makes sense to you, do you think we understand each other at all? Please say somethng.

  • ali abdulrahman tembo
    ali abdulrahman tembo Aug 28, 2012

    what's happening is that when i turn the ignition to on (cold engine) the gauge jumps to red, as if the circuit has been shorted . when i remove the wire to the temperature sensor, i expect the guage to go to zero, minimum but the gauge still remains at red as long as ignition is on .could it be the gauge itself is shorted?

  • ali abdulrahman tembo
    ali abdulrahman tembo Aug 28, 2012

    have you seen my explaination?


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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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Why does radiator fan work when air is on but not when heater is on?

Have you waited long enough?
Sometimes it can take 5 -10 minutes before it turns on while using heater.

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How do I solve overheating?

First, find the problem.
When the engine is running, whenever it reaches the temperature of the thermostat, that thermostat is supposed to open, allowing the hot coolant to flow to the radiator, to maintain proper engine temperature.
The thermostat could be stuck closed, needing replacement.
Whenever the engine gets warm, there is also an electric fan in front of the radiator, to cool the hot coolant in the radiator.
This fan works off a sensor that is ******* into the engine block (whose function is to read the engine temperature) and sends an electric signal to the electric fan to start when needed.
The sensor could be bad, the fan motor could be bad, and there is a relay in the system that could be bad also.
God bless your efforts.

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Finding data port on 1997 Saab 900 se

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Feb 28, 2013 | Saab 900 Cars & Trucks

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I have a 1996 saab thats keeps over heating everytome i add coolant & water to it it never stay n it runs out to da ground when i drive it i hear a funny clicking noise n da engine steam comes through...

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

Aug 26, 2011 | 1996 Saab 900

2 Answers


If your referring to your coolant temperature is running hot this could be caused by a number of things first i would check and make sure your coolant level is full and that your drivebelt is tensioned properly, after all of that checks out, check for a potential problem with your thermostat being stuck closed you could usually verify this by checking the temperature of the upper and lower radiator hoses if the bottom radiator hose is very hot but the top hadiator hose is luke warm that most likely mean the thermostat is stuck closed and is not allowing the hot coolant to escape the engine and go to the radiator if both hoses are hot the thermostat is working, next feel the upper half of the radiator and the lower half of the radiator if theres a big difference in temperature there this usually means theres a blockage inside the radiator and a flush may be needed or a radiator replacement if a flush doesnt work, if the coolant system appears to be cirrculating coolant properly there most likely is a problem with your head gasket causing the engine not to be able to maintain its temperature correctly....

Dec 06, 2010 | 1997 Oldsmobile Cutlass Supreme

1 Answer

Where is the thermostat in a 900s oh. 97 saab 900S Well my car was overheating and I notice in this model car if you need your oil changed it will overheat. So there is oil and all my fluids are full...

Oil change interval has nothing to do with operating temperature. If your coolant is full, feel the upper radiator hose, when the vehicle is up to temp. if cool , thermostat is back from that hose,

Look for air bleeds, and read owners manual, some cars have coolant bleeds. Also, heater on high when filling coolant or risk bubbles...

My thought is that your fans may not be kicking in. They should cycle on and keep temp low enough. test them.

Sep 15, 2009 | 1997 Saab 900

1 Answer

Have a 92 Pontiac Bonneville SE, runs "warm" (over 210). Once the engine fan kicks on, it never shuts off. I've replaced the entire fan assembly but new fan started doing the same thing. Is there another...

good possibility your radiator is partially obstructed either internally (calcification blocking core tubes) or externally (leaves etc either in front of a/c condenser or between condenser and radiator). When that happens,(internal) heat transfer is lessened and the fan will work overtime to keep the temperature down. Flushing will sometimes help, but chems used are milder than they used to be and often will go around internal obstructions instead of dissolving them.

Sep 12, 2009 | 1995 Pontiac Bonneville

2 Answers

Driving in very hot weather, stopped at light,

you may have blown the head gasket.
check the coolant level,is it low?
if it is ok,check the fan switch on the radiator,change the thermostat,and check that the fan is working.
the fan has to work,saab engines run very hot.
there is a after run fan switch as well that measures engine compartment temperature,and can start the fan even with the car off,so be careful.

Sep 06, 2009 | 1995 Saab 900

1 Answer

1988 Saab 900 8v Cannot locate transmission fluid checkfill point

multi-part answer!
one fan is for A/C cooling, other is for radiator. Neither come on until engine is warm. (Check the Townsend saabmaster site at for reasons why you should use low temp fan switch and thermostat)

The auto trans dip stick IS in the front, by the ignition coil. For more positive identification it should have two notches at the bottom, on opposite sides, and a label attached at the top indicating the fluid type to use. Fill between them is about 1/2 litre.

The best source of info on this car is the "Bentley Bible" aka the Saab 900 Official Service Manual, costs about $40 from Amazon!

16 valve manual:

8 valve manual :
get the appropriate manual for your car and enjoy the Saab!

Hope this helps, if it does please give a "thumbs up"!



Mar 12, 2009 | 1988 Saab 900

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