Get car scanned at a partplace. Radiator fluid cud b low. But system has some component or sensor issue. Unplug computer coupl times...connection pins cud lack good contact...its a commoncure
SOURCE: Radiator fan doesn't always turn on when engine gets hot
check fuses #25 and #6 (both 30 amp)
the fan thermostat is on the left side of the rad.
turn the ignition on, and after pulling back the boot, short across the two terminal with a screwdriver.
if the fan runs, fan and wiring are both good.
if it only runs when thermoswitch is shorted like this, switch needs to be replaced (get the low temp switch to prevent overheating - your temp gauge will not go over the middle position even on the hottest days; also get a low temp thermostat,and ALWAYS get a Saab stat, not an after market!)
if the fan doesn't run when switch is shorted, check for valtage between green wire and ground at the switch.
Voltage indicates faulty fan, if no voltage then check the fan relay J in the main fuse box.
Saabreur
SOURCE: 2000 nISSAN aLMERA n16 series cutting out -
unplug 02 sensors see if its better also check egr for hang up any codes
SOURCE: Cooling fan not activating
On most vehicles, there is a thermostatic switch located on the bottom tank of the radiator that controls the electric fan.
When AC is turned on, this switch is bypassed so its failure is 'cured.'
These switches aren't terribly expensive nor difficult to replace but ensure you don't lose coolant on the ground while replacing the switch since the stuff is tasty and toxic to animals.
If you like to be able to research and or repair minor problems like this, you might consider buying the Haynes manual for your car.
This will also let you approximately access what a repair might cost for labor if you can see the degree of difficulty yourself.
Haynes Buick manual
These are available at auto parts stores often cheaper than the online price.
We have on for (and IN) each vehicle we own since they can be lifesavers now and then.
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