Coolant fan wont come on

well first of all, check the fuse and relay for the coolant fans. if ok! to check the fans itself to see if they are ok. disconnect the fans from its wire connector, then run a wire from positive on battery to positive on fan connection. then negative from battery to negative on the fan connection. if the fans are ok, they will turn on. try by changing the temp sensor on thermostat housing, that sensor signals the fans to turn on and off. and make sure coolant level is ok. check the coolant level first.

IF CAR OVER HEAT IT WONT CRANK.CHECK COOLANT FAN FUSE AND RELAY.IF ALL IS GOOD YOU HAVE FAULTY COOLANT TEMPERATURE SENSOR.IF SENSOR OKAY HOTWIRE COOLANT FAN IF RUNS FAN GOOD IF NOT REPLACE FAN MOTOR AND CHECK COOLANT FAN WIRE CONNECTOR.

CHECK COOLANT FAN FUSE/RELAY.IF BOTH GOOD HOTWIRE COOLANT FAN IF RUN COOLANT TEMPERATURE SENSOR BAD OR FAULT IN FAN WIRING.IF COOLING FAN DONT RUN WHEN HOT WIRED REPLACED FAN MOTOT.

THE ENGINE IT WONT CRANK IF OVER HEATED CHECK COOLANT LEVEL IF LOW ADD COOLANT.REPLACE THERMOSTAT AND RADIATOR PRESSURE CAP.IF ENGINE STILL OVERHEAT AT A STANDSTILL OR IN A LONG LINE OF SLOW MOVING TRAFFIC.COOLANT FAN SHOULD COME ON.IF ENGINE OVERHEAT CHECK TO SEE IF COOLANT TURNS ON IF NO.CHECK COOLANT FAN FUSE AND RELAY.IFBOTH OKAY HOTWIRE COOLANT FAN TO SEE IF FAN RUNS IF NO REPLACE COOLANT FAN MOTOR. IF FAN RUNS PROBLEM COULD BE PCM OR THE COOLANT TEMPERATURE SENSOR FAULTY OR DAMAGE WIRE CONNECTOR TO COOLANT FAN.USE A CODE SCANNER TO LOOK FOR PCM OR ECT FAULTS.IF EVERY THING CHECK OUT OKAY LOOK AT ENGINE OIL DIP STICK.IF IT LOOKS LIGHT BROWN OR LIKE MILK SHAKE YOUR HEAD GASKET BLOWN.MAKE SURE YOU HAVE 50/50 ANTIFREEZE AND WATER TO ENGINE TO HELP RAISE BOILING POINT.WHEN OUTSIDE TEMPERATURES HOT.

Hello, try replacing the cooling fan relay(s) under the hood. Hope this helps

MOST OF THE TIME IF THE COOLING FAN FAILS TO OPERATE.THE COOLING FAN RELAY OR FUSE IS BAD.ALSO THE COOLANT TEMPERATURE SENSOR IS OPEN.THE COOLANT FAN WONT TURN ON.TO HELP YOU PIN POINT YOUR PROBLEM.GET IT SCAN.IT WILL TELL YOU IF THE COOLING FAN CIRCUIT IS WORKING OR YOU HAVE A BAD COOLANT TEMPERATURE SENSOR.YOU NEED THESE TWO COMPONENTS TO GET YOUR COOLING FAN TO OPERATE AUTOMATIC AGAIN.

This link has a diagram showing the location of the relay: http://autorepair.about.com/library/faqs/bl581g.htm

The Pulse Width Modulated (PWM) radiator cooling fan relay is located behind the front bumper fascia below the right head lamp.

CHECK FUSE AND RELAY.IF ALL IS GOOD.HOT WIRE COOLING FAN USING JUMPER WIRES.USING CAR BATTERY.IF FAN RUNS.ITS GOOD.IF FAN DONT RUN.REPLACE FAN ELECTRIC MOTOR.ALSO SCAN IT. TO MAKE SURE COOLANT TEMPERATURE SENSOR IS NOT OPEN.MAKE SURE ENGINE COOLANT TEMPERATURE SENSOR AND COOLANT TEMPERATURE READS SAME ON SCANNER IF NOT REPLACE THE COOLANT TEMPERATURE SENSOR. SEE IF COOLANT TEMPERATURE IS BAD THE COOLING FAN OR FANS WONT RUN.

drain engine coolant.relieve belt tension .and remove the drive belt.remove upper fan shroud.remove fan or fan and clutch assembly.remove water pump pulley and coolant hoses from water pump.remove water pump bolts.then remove pump from engine.pay attention to bolts location because they are different lenghts.clean water pump gasket mounting surface dont scratch .or pump gasket wont seal and leak .apply sealant to water pump bolts.install water pump with new gasket.if gasket paper put a sealant on it.torque water pump bolts to 30 ft lbs.if you got a 2.2L engine torque water pump bolts to 18 ft lbs.install coolant hoses on pump .install water pump pulley.install fan and fan clutch assembly.install the drive belt .and the upper fan shroud.fill the radiator with coolant.then run engine to check for leaks.WARNING AS A SAFETY PRECAUTION REMOVE NEGATIVE BATTERY CABLE SO CAR WONT BE CRANK BY ACCIDENT. ALSOOOO DONT FORGET TO TURN OFF RADIO FIRST BEFORE DISCONNECTING BATTERY SO YOU WONT LOSE YOUR RADIO CODE.

i am a masrer volvo ASE MASTER TECH yes the one with thermometer is the coolant low and square sounds light the Generator light and why is coolant low???? is fan working properly and relay?? and under thermostat there is a coolant temp sensor and to clarify meaning wet is that the coolant temp sensor has enough coolant to the sensor INSIDE THE THERMOSTAT housing