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

You need a new heat sensor. It should be on the radiator at the end of a wire from the motor fan, Ask someone at a do it yourself parts place about the part and have them print out how to install it. Or better yet, buy a repair manual for about 15 bucks and it will tell you exactly how to do it, where the part is, etc.

bob

Try to replace the fan relay. If this will not work, replace the temperature sensor that goes with the relay.

U might want to put it on swith it easy,r than u think. look how easy 2 wires of fan make 1 go to battery run 1 in to the car where u want to put it run 1 more wire from black on battery to in side ur car with the 1 u put in ur car befor an run them to switch it dont madder how u wire it up if u wire up not right the fan wiil spin air off motor but if u do it correct it will push air on the motor hope this helps u