What could cause the temperature gauge to fluctuate ?

2017-03-17 5:10 am

I put key in ignition this morning, temp gauge fluctuated went right into the red then back down and back to red about 5 times. started engine continued to bounce around even while driving

I took coolant cap off but it still fluctuated. it did this for a while last year but stopped for a while but then I noticed it fluctuating again today.

car is a ford focus 2006 mk2 sport 1.8 tdci

any ideas to the cause ?

thanks

更新1:

Is it possible a crack in the head or engine block could be the cause ?

更新2:

It happens after I get in my car after it has been parked a while such as over night and put the key in the ignition, before I even start the engine it fluctuates, and often continues to fluctuate after starting the engine

回答 (4)

[匿名]

2017-03-17 7:51 am

Unplug the coolant temperature sending unit and see if the gauge still does that.If it does it's likely a bad gauge or a short in the wiring harness.

參考: Mitsubishi Master Tech

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[匿名]

2017-03-17 10:46 am

Replace the ECT sensor.

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The Devil

2017-03-17 7:09 am

That seems like a loose wire to the sensor. All this time, you never had it looked at indicates how you maintain your car- or, rather don't maintain it.

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[匿名]

2017-03-17 6:50 am

God created ****, Ford put it on wheels, of course you are going to have these problems

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