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Ford Focus C-MAX 1,8 TDCI 2006 Fluctuating engine temperature gauge

loleczek189 10032 8
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  • #1 16919519
    loleczek189
    Level 13  
    Posts: 196
    Help: 1
    Rate: 19
    Engine temperature gauge fluctuates. After visiting the mechanic, the thermostat with the fluid replaced, 3 sensors in the cooling system checked - ok, wiring harnesses checked - ok. The computer also connected while driving does not show any errors, the only thing is a waving indicator in the range of 65-85 'C. Looking for the reason , What could it be ? anyone have any idea? Thanks in advance for the hints.
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  • #2 16919543
    szymitsu21
    VIP Meritorious for electroda.pl  
    Posts: 3702
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    And he also sees the actual temp as a variable? is it 80 ° and the summer indicator?
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  • #3 16919852
    MobilTruck
    Level 31  
    Posts: 1703
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    loleczek189 wrote:
    Engine temperature gauge fluctuates.

    And that's what I would focus on. Clocks to control.
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  • #4 16920409
    loleczek189
    Level 13  
    Posts: 196
    Help: 1
    Rate: 19
    The temperature that the gauge shows changes in the same way as the temperature read by a computer
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  • #6 16921296
    mario 77
    Level 23  
    Posts: 510
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    Are these jumps in temperature stretched over time, or does it jump up and down unnaturally in one second? If these are such quick changes, despite the fact that you wrote that the harnesses are checked, check the pins in the sensor plug and the wires just behind the plug. You can observe the temperature and bend it with the beam. I've been through the same problem.
  • #7 16921559
    loleczek189
    Level 13  
    Posts: 196
    Help: 1
    Rate: 19
    When it comes to these drops, there is no rule, the temperature can start to drop more than once as the engine turns to revolutions.
    Could I ask for more or less places where I should move the beams? Check on the fired engine is the ignition switch in the ignition position enough?
  • #8 18088377
    Czarny4994
    Level 27  
    Posts: 664
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    Loleczek189 I have a similar problem. Have you somehow solved it?
  • #9 18137938
    loleczek189
    Level 13  
    Posts: 196
    Help: 1
    Rate: 19
    Most likely, the temperature sensor is damaged, although he did not replace it because I changed the car.

    best regards
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Topic summary

✨ The discussion revolves around a Ford Focus C-MAX 1.8 TDCI (2006) experiencing fluctuations in the engine temperature gauge, which ranges between 65-85 °C. Despite replacing the thermostat and coolant, checking three sensors, and verifying wiring harnesses, the issue persists without any error codes detected by the onboard computer. Participants suggest monitoring the temperature changes while driving versus idling, checking the sensor plug pins and wiring for damage, and considering the possibility of a faulty temperature sensor. The original poster seeks further advice on specific areas to inspect for potential wiring issues.
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