Mondeo Mk3 Temperature Gauge fluctuates ("jumps!") - Electrical (Mk3 Mondeo) - TalkFord.com

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Mondeo Mk3 Temperature Gauge fluctuates ("jumps!")

temperature gauge dashboard

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#1 mondeomk3fan

mondeomk3fan

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  • Vehicle Driven:Mondeo Mk3 Zetec 1.8
  • Name:Vivian
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Posted 17 February 2020 - 11:38 PM

Hi Folks,

 

I have a 55 reg Mondeo Mk3 1.8 petrol Zetec for the last 12 years, 91k on the clock

.

I have cared for it well - regularly services and she still drives beautifully and looks great.

 

But just recently I noticed the temperature gauge needle fluctuates on long runs (it has previously always remained solidly in the middle once the engine is warm).

 

So what happens now is that it stays in the middle for around 15 minutes then it suddenly jumps up to nearly in the red, then after a few minutes jumps back to around a third before jumping back to the centre again!  The needle doesn't move slowly up and down but "jumps" around!  Most bizarre!  And happens at all driving speeds.  I took it on a two hour motorway run today and it was jumping  throughout!

 

Just wondering if anyone had a similar problem, or would have an idea what's happening?  I would add that the car drives beautifully when this is happening, and it ticks over fine at standstill.

 

My garage thought it may be the sensor, so they changed it but unfortunately that hasn't made any difference.

 

Before I take it back, I thought I'd ask here first.

 

Thanks for reading this.

 

Vivian



#2 PURPLE_2L_LX

PURPLE_2L_LX

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Posted 18 February 2020 - 07:46 PM

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Get an OBD reader and see if the temperature really is jumping around or whether the

reader shows a stable reading. If its stable then its probable the dash at fault. If the

temperature is jumping around it maybe the sensor or an airlock or a lack of coolant.

 

Belt slipping or pump failing, slipping on its shaft?


  • mondeomk3fan likes this

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#3 mondeomk3fan

mondeomk3fan

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Posted 18 February 2020 - 10:32 PM

Get an OBD reader and see if the temperature really is jumping around or whether the

reader shows a stable reading. If its stable then its probable the dash at fault. If the

temperature is jumping around it maybe the sensor or an airlock or a lack of coolant.

 

Belt slipping or pump failing, slipping on its shaft?

 

Thanks very much Purple, I'll get those checked. 

 

Strangely, I took the car for a good 40 mile run today and the needle was rock solid on the centre for the entire journey!  So it's probably going to be one of those intermittent "hard to pin down" problems!

 

The coolant level is spot on and the heater is working fine, so I don't think it's too serious - yet!

 

Cheers. 







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