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Also, consider seriously about replacing the water pump. I have a friend with this exact car, and they had the same problem - the water pump was literally "gone" - when it was pulled and shown to me, I was amazed at the condition - this was the factory water pump and if you can picture what fan blades look like, imagine the fan without the complete blades - they were completely corroded and the pump was seized up - make sure you drive as little as possibe, as this friend had driven on it with the pump in that condition for months, which in turn caused a blown head gasket as well as several other mechanical problems.
CHECK TO SEE IF COOLING FAN IS RUNNING.IF NO CHECK COOLING FAN FUSE AND RELAY.THE COOLING FAN NEED TO BE RUNNING WHEN AC ON BECAUSE AIR CONDITIONER PUT A LOAD ON ENGINE.COOLING FAN KEEP RADIATOR AND AC CONDENSOR COOL.FAN NEED TO RUNNING.
DO YOU HAVE CLUTCH TYPE FAN OR ELECTRIC.IF YOU HAVE ELECTRIC COOLING FAN LOOK FOR BLOWED 50 AMP FUSE IN THE ENGINE COMPARTMENT FUSE BOX.IF YOU HAVE CLUTCH COOLING FAN.FAN SHOULD HAVE RESISTANCE TO TURN BY HAND IF ENGINE IS HOT.IF CLUTCH FAN LOOSE FREEWHEEL ALL THE TIME FAN CLUTCH IS BAD.
the overheating could be a number of things from a thermostat, cooling fan not turning on(bad fuse), bad water pump or a circulation/radiator issue. Let the car run, have someone watch the temp in the car. As it starts to climb see if the cooling fan turns on. If not this is ur prob. If not replace the thermostat, usually less than $5. Ur check engine light should be on if the o2 sensor is bad assuming the previous owners didnt disconnect it. As far as the trans goes, run the car shift thru all the gears or go for a short ride and check the fluid while its running. If the fluid is ok, bring it back to whoever put it in. There should be some type of warranty. Good luck, hope i was some help
there is a fuse box under the hood it will have a fuse and a relay swap the relay with anoter one in the box to see if they come on turn the ac on also to see if they come on the fuse may not be labled it will say in the owners manual if it still doesnt come one probably a bad fan motor
I would check to make sure that the cooling fans are capable of running. The fan's won't come on unless either the a/c is on [provided the a/c works of course] or the engine temperature has reached about 218 degrees. A quick fan test is to allow the car to idle in the driveway with both the a/c and defrost "off" and with transmission in Park. As it warms up the cooling fans should come on once the temp gauge is about 3/4 of the way up [give or take a little] If the fan's won't come on at this point then odds are you've got either a bad fan[s], blown fuse, or bad control relay. As for potential damage caused from the overheating: the most common problem I see is head gasket leaks that allow some of the combustion gasses to get into the cooling system which disrupts the coolant flow and causes it to overheat again from this new problem. A common symptom of a head gasket leak is an engine that will suddenly run hot [but the heater stops blowing hot air when this is happening] then the engine will again run cool nearly as quickly for a while before repeating the cycle. If the leak is big enough it will often force coolant out of the reserve tank when this is happening. If it's been driven for some time and hasn't overheated she may have gotten lucky and avoided any damage. Hope this helps a bit!
Check at the connector going to the fans for current, also connect a hot wire to the fans there to see if they are burned out. If fans are good you may have a problem with one of the coolant temp sensors, there is one that runs the gauge, and one that signals the fans to come on
The coolant is working well, because the engine stays cool while driving. The problem is the fan relay, fuse, or the fan itself. Do you have AC? If so, turn it on and you should have instant running of the fan. The normal operation of the fan is: the engine thermal sensor tells the computer that it is getting hot which in turn tells the fan relay to turn on and that is supposed to turn on the fan itself. The fuse protects the high current wire to the fan. Try to turn the fan blades by hand--if stuck or very hard to turn, replace the fan motor. If you can't find the fan relay in the fuse compartment, it may be a solid-state device that is located near the fan motor. Chase the fan wiring back to the relay. Hope this helps!
The Taurus has Two temp sensors. One for the dash, which is isolated, then one for the PCM, it also controls when the fan relay should actuate. Its a 2 wire sensor, just above the thermostat. If you remove the harness from that sensor, and the cooling fan comes on, at any temp, (should take 5- 10 seconds) then thats your fault.