Coolant level sensor location (not on the expansion tank)

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My Name: Tony-55

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Hi.
I have a 1.6 hdi Exclusive that is giving me a low coolant level warning message, and also a flashing temp warning lamp. There does not appear to be a level sensor on the expansion bottle. The bottle is filled to the level. I have fitted a new temp sensor just in case, but no difference. Please can anyone enlighten me on where (and if there is one) the sensor may be? Or if there is another underlying issue here? Thank you for any advice.
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Hello

Please take a picture of YOUR coolant expansion tank fitted to your Citroen C3.

Attach the photo (instructions here)

So we can see which cooling tank system you have fitted to the 1.6 HDi
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My Name: Tony-55

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Posts: 10
Joined: Mon Apr 12, 2021 2:59 pm
Model: C3 2006-2009, Facelift model
Year: 2008 (08)
Engine Size: 1.6 (16v)
Fuel Type: Diesel
Mileage: 202000
Trim Level: Exclusive Plus
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV6 16-valve diesel (92 PS)
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Hi.
Thanks for your help. I have added 3 images that I hope will do. Just as an update: Today, I removed the coolant level fuse (no. 7) to see if it made any difference. Nothing at all I'm afraid. Now refitted.
Regards.
Citroen C3 coolant expansion chamber missing level sensor
Citroen C3 coolant expansion chamber missing level sensor
Citroen C3 coolant expansion chamber missing level sensor
Citroen C3 coolant expansion chamber missing level sensor
Citroen C3 coolant expansion chamber missing level sensor
Citroen C3 coolant expansion chamber missing level sensor
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Hi Tony-55

This is interesting.

Most of the engine configurations have a level sensor fitted to the expansion tank.


citroen C3 coolant expansion tank with level sensor.
citroen C3 coolant expansion tank with level sensor.
Citroen_C3_Coolant_level.jpg (50.94 KiB) Viewed 543 times


But there are a few that show-up without the sensor, on a particular RPO




1323.T9
1323.T9
1323 -T9_Degassing_tank_Citroen_C3.jpg (12.68 KiB) Viewed 543 times




Can you add your RPO

and say if there is a FAP/DPF fitted (110bhp engine) or if it's the 92hp engine or post the VIN


This should help pin down a drawing/diagram that may show how they get the coolant level without the coolant level sensor in the expansion tank.


Engine is probably going to be DV6TED4 or DV6ATED4
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My Name: Arfur Dent

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Tony-55 wrote: Tue Apr 13, 2021 1:06 pm Hi.
Thanks for your help. I have added 3 images that I hope will do. Just as an update: Today, I removed the coolant level fuse (no. 7) to see if it made any difference. Nothing at all I'm afraid. Now refitted.
Regards.

Coolant3.jpg

Coolant2.jpg

Coolant1.jpg
Thanks for the pictures.

Would you also take one of the dashboard display that shows the coolant level and it's warning light.


Has the fault only recently appeared

How low was the level before you topped it up again? (how much coolant did it take to bring it to the level it is now)
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My Name: Tony-55

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Posts: 10
Joined: Mon Apr 12, 2021 2:59 pm
Model: C3 2006-2009, Facelift model
Year: 2008 (08)
Engine Size: 1.6 (16v)
Fuel Type: Diesel
Mileage: 202000
Trim Level: Exclusive Plus
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV6 16-valve diesel (92 PS)
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Hi Arfur Dent.
Please find the RPO & VIN images. I couldn't find the VIN on the car so used the logbook (I've had the car from new) for the pic. I believe it is the 92hp engine.
Thanks again for your interest and time.
Regards.

VIN
VIN
Citroen C3 RPO
Citroen C3 RPO
Citroen C3 RPO
Citroen C3 RPO
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My Name: Arfur Dent

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Tony-55 wrote: Tue Apr 13, 2021 3:01 pm Hi Arfur Dent.
Please find the RPO & VIN images. I couldn't find the VIN on the car so used the logbook (I've had the car from new) for the pic. I believe it is the 92hp engine.
Thanks again for your interest and time.
Regards.

Can you also snag one of the dashboard display (speedo etc) showing the level sensor error please.
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My Name: Tony-55

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Posts: 10
Joined: Mon Apr 12, 2021 2:59 pm
Model: C3 2006-2009, Facelift model
Year: 2008 (08)
Engine Size: 1.6 (16v)
Fuel Type: Diesel
Mileage: 202000
Trim Level: Exclusive Plus
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV6 16-valve diesel (92 PS)
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Hi.
Please find the images. The message is in two parts. The red warning light continually flashes.
Many thanks.
Tony
Attachments
Message pt2.jpg
Message pt2.jpg (45.1 KiB) Viewed 525 times
Message pt1.jpg
Flashing warning light.jpg
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My Name: Arfur Dent

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Engine Size: 1.4 (16v)
Fuel Type: Diesel
Mileage: 100000
Trim Level: Exclusive
Gearbox: Manual 5 speed
DPF: No
LHD or RHD: RHD (UK)
Engine name: DV4 16-valve diesel (90 PS)
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I had a good look through the documentation available to me for that engine (9HX - DV6ATED4 - 92hp) on the RPO 11404 - 29th January 2008 production.


I can't see any form of coolant level sensor fitted, not even to the radiator head - still worth looking there though ;)

There are quite a few Citroen diesel models that don't have a coolant level sensor and there are even projects to retro fit one and enable the dashboard messages by using lexia to enable the BSI features after adding the wires and sensor.

But this doesn't explain how the BSI knows the level is low to give the error message that you have.


Was there any work done on the car before the error message appeared?

and

Was the level actually low the first time you saw the warning?


I'm thinking of a BSI reset if it seems to be a genuine ECU error?
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Ok don't know much about diesels but the principal of operation on the petrol version might help.

For petrol engines there is a "coolant level sensor" under the thermostat housing on the cylinder head. This is basically another temperature sensor but this time it is monitoring the CYLINDER HEAD temperature and NOT the coolant!! This is an on/off type thermostat that opens at about 120'C (that's only from memory, not sure). It removes the earth from the coolant temperature sensor and your instrument indicator goes all the way to 'hot'. The theory is that if the cylinder head gets to that temperature there must be a loss of coolant.
The sensor has a blue connector.
If the wiring and connector pins are serviceable it could be the sensor. The sensor sits in an air cavity and the sensor can be removed without fear of loosing coolant.

Of course you should ensure there is coolant in the system and the actual coolant level is correct.

By the way the bio says it's an ET3 engine. That should be updated.
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