C5 2.0 Hdi Coolant Leak

[yoseff]

Don't know yet exactly what broke to make it happen , but had a large coolant leak (more than 2.5 Liters went out)
The thermostat housing or other plastic tube is the suspect. Only Monday will know.
Anyway , my biggest shock was that unlike the previous C5 , this X7 doesn't warn about low coolant level
Could they do that just to economize some euros? That was surely a huge disappointment regarding the X7...
Did already anyone adapted successfully some warning for low coolant level on the X7? That's something i'd be interested.
Also could i have a diagram of the coolant system in order to locate the part to get in Monday?
Finally , i'm wanting to put a new thermostat as the one that is there seems not to be closing properly (temp sits on the 70'sº on normal usage)
Any advice regarding brands to choose / avoid?

[yoseff]

Quick update - there's no update yet as my friend that is going to have a look at the car and (hopefully) fix it , didn't hat the time yet. Has been a week away from my baby - tough times
Anyway , i just hope is no part that is NFP...
About the retrofitting of a water level sensor in the X7 , i've seen (among other stuff) this video :
Did anyone already did something like this?
I still dont believe that citroen fitted a stupid windscreen washer level warning and not a (much more important) coolant level sensor - Shame on you Citroen...
But well , i intend to correct that , and ideas / solutions are welcome

[GiveMeABreak]

They often don't use actual level sensors on the basis that if the system gets too hot then there is likely a coolant leak. So you'll get the temperature gauge markings shown on the instrument panel as segments, as well as the warning light and the STOP lamp with a message.

Here are the values for triggering on your X7 with DW10CTED4 engine:

Designation	Temperature Threshold
Temperature threshold (For illumination of the "STOP" warning light on the instrument panel)	118 °C
Temperature threshold (For extinguishing the "STOP" warning light on the instrument panel)	115 °C
Cut-in threshold ( electric cooling fan unit - Low speed)	97 °C
Triggering threshold ( electric cooling fan unit - Low speed)	95 °C
Cut-in threshold ( electric cooling fan unit - High-speed)	105 °C
Triggering threshold ( electric cooling fan unit -High-speed)	103 °C
Air conditioning cut-off temperature	Exterior temperature below 3°C
Air conditioning re-engagement temperature	Exterior temperatures above 4,5°C

[yoseff]

Thanks for the answer , Marc.
But if the leak is too big , can happen that the temperature sensor gets "out of the water" , and the engine just melts without any temperature warning?
I'd still prefer to have a water level sensor. That way the car could be stopped before bigger damage is done.
Anyway , the C5 still not in the road as the problem was one tube and an engine seal (Unsure if that's the correct word , but are those metal seals that cover the holes on the engine coolant circuit.)
The ones in the back the engine are hard to reach , so the engine was taken out in order to be repaired.
Can post a pic if it's not understandable what part is.
Thermostat will also be changed as mine was stuck open.

[yoseff]

As an (late) update to this post, the C5 is now perfected and a coolant leak will not get me off guard again. It has now what the engineers should have kept from previous version

Don't ask me for installation details, as it was a friend installing it. All i know is that it works like it was from factory, even warning in the display (it seems thet the ecu was ready to have that sensor fitted ! Duck you citroen)

All the 7 spheres were put to original pressures too