Engine cooling fan doesn't turn on and the fan fuse and two relays are good, so what might be wrong, temperature sendsor, how do I test that and where is it located and is the fan hard to take out and replace?
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Re: Engine cooling fan not turning on.
Actually the contour and mystique both have this problem they tend to overheat and ruin engines and transmissions when the fan quits working the best fix is a kit you get from ford or advance auto parts it makes the coolong fan run all the time the engine is on and this will save you lots of problems in the future, not only am i a master automotive tech but i have owned 6 of these cars. the 96 mystique beng my favorite. mercury version. good luck james
The electric motor can go bad like my Tbird has 2 times in 10 years.
Most Ford's have a Temp Switch and Temp Sending unit.
The Temp Switch tells the guage on dash the temp and the Temp Sending unit tells the computer how hot engine is and then kicks fan on (assuming all relays and fuses ok).
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That would depend upon where you placed the voltage on the relay. And even then not necessarily so. The only thing you verified with the test was that the fan itself is okay. The cooling fan relay is powered from the ECM (computer). The ECM will power the cooling fan whenever one of two conditions exists:
1. Engine temperature exceeds about 210 degrees F. his temp is determined by the coolant temperature sensor.
2. The A/C is turned on. The fans must run at all times when A/C is on.
So, with the engine running, turn on the A/C. If the cooling fan activates, then you know the ECM, relay, and fan is OK. If the fan then doesn't activate when the engine temp gets high, it is the coolant temperature sensor that is the culprit.
If the fan doesn't run when you turn on the A/C, then, since you know the fan works, try the relay next, because other than wiring, the only other item that could be wrong is the ECM (and you don't want to go there!)
At the main fuse and relay box, check the 30A EGI INJ fuse. If OK, the main relay closes to apply power to the cooling fan relay. Next, check the 30A FAN 1 and FAN 2 fuses.If OK, power is being applied to the fan control module. The PCM processes engine coolant temperature sensor input and sends a signal to the fan control module which, in turn, causes the cooling fan motor to operate. Fan failure could be caused by malfunction of the cooling fan relay, the fan control module, the engine coolant temperature sensor, the cooling fan motor itself, or the PCM
if engine at long stand still,the engine temperature will rise about 190 degrees the cooling fan suppose to automaticaly turn on when coolant temperature sensor get hot it cause its resistance decrease causing pcm to send power to coolant fan relays and cooling fans, when you turn on AC the cooling fans suppose to turn on to cool down AC CONDENSOR, IF NOT AC WONT WORK COOLING FAN COOLS DOWN REFRIGERANT SO IT CAN RECYCLE THROUGH THE SYSTEM AGAIN.your cooling is suppose to turn on when engine at a sit still if vechicle not moving as coolant temperature rises at a set point the cooling fans will turn on cool down engine.cooling fans dont turn on when you first cold stsrt vechicle unless you have AC SWITCH ON.if cooling fans dont turn on when vechicle at a long stand still or moving along slow traffic.if coolant temperature sensor been replaced and fuses and relays okay have dealership check see if pcm driver circuit working faulty pcm will cause cooling fans not to turn on.
Well the code is for the circuit - the computer commands the relay to turn the fan on and it doesn't happen. The computer provides the ground for the relay. If you have replaced the relay and the fan and the fuse still blows, I would look for a problem in the harness between the fuse box and the fan, including the ground circuit for the fan. The fuse for the cooling fan is usually a 30amp marked "cooling fan" in the fuse box in the engine compartment. Do you know what the 25amp fuse that is blowing is for ?
Check all fuses first. if the fuses are okay, disconnect the engine cooling fan connector and using jumper wires, connect the fan motor directly to the battery and ground. If the fan still doesn't work, replace it. If the fan does work, its relay may be faulty. Check in the engine compartment fuse box for the cooling fan relays. Try switching the cooling fan relays and see if the engine fan comes on and the a/c condensor fan stops working. If so, the engine cooling fan relay is faulty. If the engine fan still doesn't come on with a good relay, then check the engine temperature switch located at the passenger end of the front cylinder head. It is supposed to switch (have continuity) when the engine temperature reaches 205 deg F. You can remove the switch and put it in a pot of close to boiling water (212 deg F). If it doesn't have continuity at that temperature, it is defective.
the cooling fans on your car are comanded on by the engine control module which reads engine temperature from the temperature sensor . when comanded on the engine control module sends a signal to the cooling fan relays . which in turn runs the current to the cooling fans . So you might want to check the cooling fan relays and make sure the fues for the cooling fans are good and the relays .if the cooling fan fuses and relays are good it could be a problem with the fan motors or the engine control module not reading the right temperature in that case it could mean you have a problem with the temperature sensor
I'll assume the car is at operating temperature. Try locating the cooling fan fuse under the hood. If that is good, the temperature/fan switch is bad. If that checks good, the relay might be the problem, but not likely. These switches are a common problem.
REPLACE THERMOSTAT BUT IT SOUND LIKE FAULTY COOLANT TEMPERATURE SENSOR.BUT CHECK COOLING FAN FUSE AND RELAY.IF ALL IS GOOD HOT WIRE COOLING FAN IF COOLING FAN WORKS.PROBLEM COULD BE FAULTY COOLANT TEMPERATURE SENSOR. DAMAGE FAN WIRING OR FAULTY PCM.IF COOLING FAN DONT RUN WHEN HOT WIRED.REPLACE FAN AND MOTOR.
HOT WIRE COOLING FAN USING JUMPER WIRES TO BATTERY.IF FAN DONT RUN WHEN HOT WIRED FAN MOTOR BAD NEED REPLACING. IF FAN RUN WHEN HOT WIRED. CHECK COOLING FAN FUSE AND RELAY.IF ALL IS GOOD.YOUR ENGINE COOLANT TEMPERATURE SENSOR NOT WORKING.IT CONTROL COOLING FAN AT SET TEMPERATURE IF SENSOR OPEN OR FAULTY THE COOLING FAN WONT TURN ON.CHECK COOLING FAN WIRES FOR DAMAGE.IF ALL STILL CHECK OUT GOOD HAVE VECHICLE SCANNED FOR PCM FAULT.IF IT FAILS NO COOLING FAN WONT TURN ON.
There should be a cooling fan relay, usually 1 for the engine and 1 for AC (might be labeled as secondary, or accessory.) I would check that next. A working relay will CLICK when activated. The fans are normally told to turn on by the PCM, which receives a signal from the coolant temperature sensor (CTS). It's possible the CTS is not sending the proper signal to the PCM, but I would first check the relays.