Question about Ford Fiesta

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Overheating fans I have a Fiesta '58 plate 1.6 diesel and my cooling fan is constantly running. I have to disconnect it to prevent the battery going flat. ford have looked at it 4 times and cannot fix the problem. Can you help.

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  • 64 Answers

I am sure you checked the thermal switch at engine ..yes and make sure wires are all good..test switch by unplugging wire when cold if fan shuts off its the switch

Posted on Mar 31, 2014

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6ya6ya
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Posted on Jan 02, 2017

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jmassengill
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SOURCE: Car overheating; cooling fan not working

This is most likely caused by a bad sensor in the radiator. I have never repaired this on a ford focus so I can't tell you where the sensor is located but if you find the sensor and then make a jumper wire and remove the wire from the sensor and jump the two wires together and turn the car ON (don't start the car) if the fan runs, the sensor is bad and must be replaced.

Posted on Nov 07, 2008

  • 1 Answer

SOURCE: cooling fan relay and fan wiring diagram

zirgo fan setup for relay and sender

Posted on Mar 17, 2009

  • 4 Answers

SOURCE: electric cooling fans run constantly even after vehicle is off

Try diconnecting the two wires on the temp sensor at the bottom of the radiator, you may be able to trace the wires from the fan, it that stops the fan, then replace the sensor and it should be ok

Posted on Mar 29, 2009

wyatt1582
  • 453 Answers

SOURCE: Cooling fans will not kick in.

The fans won't kick on then you need to replace the coolant temp sensor this runs your fans.

Posted on Apr 22, 2009

  • 31 Answers

SOURCE: my 2004 t-bird has overheating problems

i would try a new thermostat and a good rad flush, and if your running dexcool switch to a green type (prestone, motomaster)
that worked in a ford taurus for us

Posted on Jul 01, 2009

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1 Answer

What would cause a toyota corrola cooling fan fail to start automatically when engine is hot.but fan runs continously when you disconnect thermal switch.


Disconnecting the thermal switch or temp sensor puts the engine computer in limp mode and the computer will activate the fan relay to prevent overheating.
The temp sensor could be faulty, or something is not telling the computer the engine is hot enough to need the fan.

Sep 28, 2015 | Toyota Cars & Trucks

1 Answer

My cooling fan will not turn off. 2001 Hyundai Elantra GLS 2.0 l engine


1. Check the scan data for engine temperature to see if it shows that the engine is running hot. The ECM will turn the A/C relay off if it thinks that the engine is overheating. Check engine coolant temp sensor

2. Test voltage at the Powertrain Control Module (PCM) pin 50 (Yellow) and pin 58 Yellow/Black. Both should have battery voltage when the system is turned on and the engine is running. If not, then the wiring needs to be checked.

3. If battery voltage is present on the two pins, then manually ground pin 68 (Orange) at the PCM and this should ground the A/C relay and the clutch should engage.

4. If it does, verify that the PCM powers and grounds and connections are good.

Mar 27, 2015 | 2001 Hyundai Elantra GLS

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Why does cooling fan run constantly on 2004 pontiac sunfire


Have you checked the ecm for trouble codes ? The fan runs all the time as a safety to try to prevent the engine from overheating.

Aug 06, 2014 | 2004 Pontiac Sunfire

1 Answer

2007 town & counrty (3.8) cooling fans staying on


the radiator temperature is broken or cable to it is disconnected ?
if true they are set to run constant the fans to protect the engine from overheating. also check the relay is still seated correctly.

Dec 23, 2013 | 2007 Chrysler Town & Country LX New Cars

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Electric Radiator Fan Does Not Come On


Chevy dealer says will not come on until temperature reaches 219 f

May 16, 2010 | 2007 Chevrolet Silverado 1500 2WD

1 Answer

Where is the switch that cuts on the cooling fans on a 2000 grand am with a 3.4 engine


The computer turns on the fan. Based on sensors from the motor.
DTC P0480 - COOLING FAN CIRCUIT

Circuit Description

The cooling fan is controlled by PCM through the fan relay based on inputs from ECT sensor, IAT sensor, A/C selector switch, A/C refrigerant pressure switch and vehicle speed sensor. PCM controls cooling fan by grounding cooling fan control circuit which turns on cooling fan relay.

The fan relay will be commanded on when ECT reaches 223°F (106°C) or greater, A/C is requested or vehicle speed is less than 38 MPH. Cooling fan relay will also be commanded on regardless of vehicle speed when a DTC is set requesting cooling fan to be on, ECT is 304°F (151°C) or greater, or A/C refrigerant pressure is high. Cooling fan may also be commanded on when engine is not running, on certain conditions.

Conditions for setting DTC:

Battery voltage greater than 9.5 volts.

Cooling fan fault line detects a malfunction for 6 seconds.

1. Check cooling system. Ensure coolant level and belt tension are correct. Adjust/repair as necessary. After repairs, go to step 23). If no adjustment or repairs were required, go to next step.

2. Turn ignition on, with engine off. Using scan tool, check if cooling fan is operating with ECT at less than 209°F (98°C). If cooling fan is off, go to next step. If cooling fan is on, go to step 4).

3. Command cooling fan relay on. If cooling fan operates, go to step 23). If cooling fan does not operate, go to step 5).

4. Turn ignition off. Disconnect PCM harness connector. If cooling fan turns off, go to step 23). If cooling fan does not turn off, go to step 6).

5. Disconnect cooling fan relay harness connector. Using a test light connected to ground, probe battery feed circuits in relay harness connector. If test light illuminates on both terminals, go to step 7). If test light does not illuminate on both terminals, go to step icon_cool.gif.

6. Disconnect cooling fan relay harness connector. With test light connected to ground, probe battery feed circuit in relay harness connector. If test light illuminates, go to step 9). If test light does not illuminate, go to step 10).

7. Connect a jumper wire between cooling fan relay battery feed and cooling fan battery feed circuit. If cooling fan operates, go to step 11). If cooling fan does not operate, go to step 12).

8. Repair open in battery feed circuit. After repairs, go to step 23).

9. Repair short to voltage in cooling fan battery feed circuit. After repairs, go to step 23).

10. Connect test light battery voltage and probe cooling fan control circuit. If test light illuminates, go to step 13). If test light does not illuminate, go to step 21).

11. Connect test light to battery voltage and probe cooling fan control circuit. Using scan tool, command cooling fan on. If test light illuminates, go to step 14). If test light does not illuminate, go to step 15).

12. With jumper wire still connected, disconnect cooling fan harness connector. Using test light connected to ground, probe cooling fan battery feed circuit. If test light illuminates, go to step 16). If test light does not illuminate, go to step 17).

13. Repair short to ground in cooling fan control circuit. After repairs, go to step 23).

14. Check terminals to cooling fan relay. Repair as necessary. After repairs, go to step 23). If terminals are okay, go to step 21).

15. Check cooling fan control circuit for open or poor connection. Repair as necessary. After repairs, go to step 23). If circuit or connection is okay, go to step 22).

16. Connect test light to battery voltage and probe cooling fan ground circuit. If test light illuminates, go to step 1icon_cool.gif. If test light does not illuminate, go to step 19).

17. Repair open or poor connection in cooling fan ignition feed circuit. After repairs, go to step 23).

18. Check for poor connections at cooling fan harness connector. Repair as necessary. After repairs, go to step 23). If connections are okay, go to step 20).

19. Repair open or poor connection in cooling fan ground circuit. After repairs, go to step 23).

20. Replace cooling fan motor. After replacing cooling and motor, go step 23).

21. Replace cooling fan relay. After replacing relay, go to step 23).

22. Replace PCM. Program replacement PCM using required equipment. After replacing PCM, go to next step.

23. Turn ignition on, with engine off. Command cooling fan on. If cooling fan operates, system is okay. If cooling fan does not operate, repeat step 1).

May 16, 2010 | 2000 Pontiac Grand Am GT

1 Answer

The fan is running to cool down my engine.. but its not overheating.2001 4 cylinder saturn l200


if it runs constantly the temp sensor is bad or termastat is stuck, Other wise fan runs prior to the overheating of your motor, preventing damage.

Dec 08, 2009 | 2001 Saturn L-Series

2 Answers

My car keeps overheating while it is idling.


If it's only happening while sitting at a stop light and idling, the problem is probably in the cooling fans. Turn your A/C on high and pop the hood. Check your cooling fans to see if they're running. If they aren't running, it's the fan relay. In my 99 Taurus, the high speed fan relay is located in a slim black box next to the battery, it's the large square relay right up front. Use a known working relay of the same size and pop it into this relay. If the fans turn on, there's your problem. Replace the relay. Try the same with the A/C on low, but this relay is in the power distribution box (number 31). The 2002 may have a CCRM (Constant Control Relay Module). The CCRM is an expensive part (over $100.00). You'll be able to tell because the CCRM is a very large box that is mounted next to the battery and contains relays that are not replacable. It'll have a part number followed by a large letter/number. You'll need this part number and large letter/number to order the new.

Jul 07, 2009 | 2002 Ford Taurus

1 Answer

The fan won't cut off onless I disconnect the battery post


does it cut off once it cools off let it run and see if it will cut off after it does cool down. Write back

Apr 23, 2009 | 1994 Chevrolet Lumina APV

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