Over heating cooling fan not coming on, where are the heat sensors located.

Either the temp sensor is bad, or the relay is bad. or the fan motor is bad. Or you have a blown fuse.
Look for fuse first.... To test if fan motor is bad disconnect the connector to the fan and jumper it to the battery.if it spins it's good. the other two. use a component locator to find their location and replace. they are inexpensive. Temp sensor is in the cooling circuit (radiator...maybe next to thermostat) the relay will be in a fuse box under the hood.

A cheap cooling sensor might not start the fan. Make sure the one you or your mechanic bought is a quality product.

Dd you check for a leak? did you know if the inside heater cooling panel it is connected to the cooling syst. (it seems like be damaged).
In other order the over heating problem could become from bad signal from cooling sensor located closer to the thermostat, did you changed? this sensor sends signal to the computer to starts the cooling fan located at radiator avoiding over heating problems!

no, o2 senser has nothing to do with your car over heating. thats either your radiator,water pump, cooling fans, heater core, or thermostat. hope this helps u :)

YOU MIGHT HAVE A BAD COOLANT TEMPERATURE SENSOR. BE CAREFUL CAUSE THE NEW SENSOR CAN BURN THE MOTOR OF THE FAN. GOOD LUCK.

Cooling fans ( on radiator ) only come on when the engine reaches a certain (hot) temprature. There is a temp sensor threaded into the radiator end reservoir that switches a relay off and on that runs the fans. Either the temp sensor or the relay is probably bad. Normally , those fans will not be on if the car is moving , the air flow from just driving is sufficient to cool the rad. If you stopped and idled for a while , eventually the rad would heat up enough for the fans to come on.

It sounds like you do need a thermostat with your heat shut off and the gauge will raise a little then the car doesn't have that heat drawn from it indicating that you most likely do need a thermostat. As far as the fans coming on immediatly that could be a different problem it is most likely the coolant temperature sensor that tells the fan's when to come on. If this sensor says the coolant is hot the fans will come on immediatly. These are seperate problems as the coolant temperature sensor does not have anything to do with the cabin heating system. You should first check the level of your coolant is full, This could also cause your cabin heating system to perform poorly, and may have adverse effects to the engine cooling system. (fans)

tempature sending sensor

Electrical cooling fans not coming on due to bad sensor, fan relay, or bad fans. Check thermostat and coolant temperature, too....accordianman

a SENSOR SWITCH located at the bottom of the radiator , its a TEMP. SWITCH , hope this helps AJ