Temp Gauge "dancing around" - Air-Con / Heating (Mk3 Mondeo) - TalkFord.com

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Temp Gauge "dancing around"


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9 replies to this topic

#1 barbu

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Posted 02 November 2020 - 07:18 PM

Hi guys ! New here. Been looking around but didn't find anything related to my problem,so here it goes:
I've got problema with my coolant temp.ONLY WHEN IT'S COLD OUTSIDE (below ~6°C). Early in the morning I make aprox 45-50km. The first 5km I make it on normal roads, the rest of it on the motorway.When I get on the motorway the engine warms up to 90°C and stays there.When I start to decelerate..the temp goes all the way down to 60-70°C..when I get on the motorway the temp goes up again.

Already change all the coolant and fitted a new thermostat. As my engine (HJBB) doesn't have a Coolant temp sensor, I don't know what else to do.

#2 PURPLE_2L_LX

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Posted 03 November 2020 - 12:21 AM

It does have a temperature sensor behind the powersteering pulley.

 

Common issue on the diesels and its probably not the sensor.

 

Its the thermostats, there are 2 of them, change them both with decent

quality items.

 

The smaller stat is called an oil cooler stat, fits on the rear of the waterpump.

 

If you can blow through that then boil it before fitting, if you can still blow through

it afterwards then send it back its faulty.


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#3 barbu

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Posted 03 November 2020 - 12:29 PM

Blowing through the smaller stat ? Ok good tip. The coolant sensor you are talking about it's the cylinder head temp sensor right ?

I've changed the stat that is right next to the power steering pump belt.

Edited by barbu, 03 November 2020 - 12:34 PM.


#4 PURPLE_2L_LX

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Posted 03 November 2020 - 04:02 PM

Did the main stat have a fairly thick gasket or a thin band? Some are sold with the

thin band which wont seal.

 

The other stat is on the rear of the waterpump, a bit fiddly to get to but only one bolt

to remove it.


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#5 barbu

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Posted 03 November 2020 - 08:21 PM

The new stat came with a round-ish gasket, the old one had like squared edges. I was going to keep the same gasket but it was to old and worn out.

#6 barbu

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Posted 23 November 2020 - 06:15 AM

UPDATE: Had a look on the other thermostat ! Seemed alright, no broken plastic or anything.

Could rust make the coolant lose its properties ??? 🤦‍♂️

#7 PURPLE_2L_LX

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Posted 23 November 2020 - 08:10 AM

If the coolant is doing its job you should not have rust in the coolant.

 

The correct red/orange OAT coolant has a lifespan of around 10 years.


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#8 barbu

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Posted 24 November 2020 - 11:12 PM

Had this car for the last 20k KM. Don't know anything about previous owner nor services. Couple of weeks ago changed the coolant (at least a part of it). From pink turned brown, and hoses look pretty rusty.

The other thermo you suggested to have a look at looks fine.No broken plastic or anything.Don't know what else to do.

#9 PURPLE_2L_LX

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Posted 25 November 2020 - 02:36 PM

Can you blow through it though?  Thats the way to test it.

 

If you can blow through it then coolant will pass no matter what temperature.

The heat will escape and the engine runs cool.


MK4.5 TDCI 140 Business Estate.

 

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ForDiag now available to victims.


#10 barbu

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Posted 26 November 2020 - 05:16 AM

Damn it !! Did not tried the blow trick ! With the pain in the arse that is to reach to that god damn bolt *facepalm*




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