Fan switch Position Hie guys i have decided to put in a temp-fan switch on my Astra G 1.8 16V ,so the question is which position is best ,the bottom horse water outlet from the engine into the radiator or on the top horse inlet to the thermostate

SOURCE: blower fan not working correctly

It is the blower motor resistor and is located under the glovebox behind the blower motor.

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: Fan switch does not work in the 1, 2, 3, position 2006 Cobalt

You have a problem with the blower motor resistor. This is a very commen problem on all gm cars and light trucks. The part is not to pricey. You can find the resistor under the glove box buy the blower motor. Two bolts and out it comes.

SOURCE: Hi Honda crv (98) R overheating.

SOUNDS LIKE YOUR THERMOSTAT IS STICKING,REPLACE THERMOSTAT FIRST OVERHEATING WILL DAMAGE ENGINE.IF THAT DOSEN'T WORK HAVE WATER PUMP CHECKED.FANS WON'T TURN ON IF HEAT FROM ENGINE IS NOT FLOWING INTO RAD BECAUSE THEROMOSTAT STUCK CLOSED,OR WATER PUMP FAILING

SOURCE: loud blower fan 2006 jeep commander

Either the motor is defective or its rubbing against a loose motor panel or there may be somthing stuck in it. Regardless have it checked out.