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?
An expert who has achieved level 2 by getting 100 points
An expert that got 5 achievements.
An expert that has over 500 points.
An expert who has answered 200 questions.
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).
or at local "Mighty Mart" making you late for something important
A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones). click here to download the app (for users in the US for now) and get all the help you need. Good luck!
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
Sensors for radiator Fan ? What sensor ? The coolant temperature sensor is an input to the PCM - engine computer ! When the engine temperature reaches 200 degree's the PCM energizes 1 to 3 Cooling fan relay's in the battery junction box (fuse-relays ) The low speed fan relay , High speed fan control relay 1 , an high speed fan control relay 2 . Now what problem are you having ? Go on you tube an check out videos on testing cooling fan's , testing relay's .Before you replace a sensor you don't need too .
There is a cooling fan relay in the under hood fuse / relay box . There is a fuse F1.8 20amp in the same under hood fuse / relay box ! If you pull the relay out of it's socket an look on the bottom you'll see some numbers , 30,87,85,86 ! 85an 86 are the control side of the relay an 30 an 87 or the load -fan side ! If you take a test light or volt meter you can check for battery voltage at pin 30 ,you could take a jumper wire from pin 30 to 87 an the fan should run , if the fan motor is good an there is battery voltage at pin 30 ! Pins 85 an 86 are the control side of the relay ,pin 86 should have battery voltage an pin 85 is from the engine computer ,when the temperature get's to 195 - 213 degrees the engine computer will ground pin 85 through a transistor inside the computer energizing the relay turning on the cooling fan ! You can test right there at the relay ! VEHICLE RELAYS Operation Diagnosis
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!)
check cooling fan fuse or fuse link.it all is good. fan relay or engine coolant temperature sensor.could have ECM FAULT it controls coolant fan relay and coolant fan.code scan for ECM FAULT YOU WILL SEE CHECK ENGINE FLASH IF PROBLEM IN THE ECM.but check cooling fan hot wire it using jumper wires to battery.if fan okay replace engine coolant temperature sensor.
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.
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
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.
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.
assuming fuse and relay are good..no fan should be running when the engine is cool/cold, the only time the fan should be running when it reach over operation temperature which then the fan kick on to bring the temperature back down to it operation temperature. both fan work in sync with one another, addition cooling is needed when the ac is running. when the last time have you replace thermostat and Thermos sensor/switch. I would replace both unit if you have not done so. The thermos/switch will turn the fan on when it reachcertaintemperature and cut off when it sense the temperature drop in the engine.