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top up water level ?


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#1 dessolbyjon

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Posted 13 March 2018 - 10:43 AM

have a 2.0hdi mk2 and the top up water level keeps flashing on even though there is enough water in tank, have changed the sensor and still the same problem, disconnected sensor and no warning, any advice would be greatly appreciated 



#2 gray

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Posted 13 March 2018 - 11:26 AM

Leave it disconnected, and keep an eye on your water level ;) Is it a new sensor, or 2nd hand ? Check back on the wiring, in case there are any frayed edges, or bad connections ? (Mine still does it occasionally, but I haven't got around to changing the sensor yet)

#3 stimulator

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Posted 13 March 2018 - 01:15 PM

On my Xsara Picasso the light flashed on, on right hand high speed bends. When checked the water level was always correct. Eventually found it was the top of the radiator had separated and some fluid was leaking out, but not enough to show on header when stationary. Anyway I changed the rad and the fault never came back. This was a MK1 and supposedly the rad design was changed on later models. Easy to check look at header on rad, where it joins the fins of the core is there any sign of wet or blue green from antifreeze.

Edited by stimulator, 13 March 2018 - 01:16 PM.

17 Reg C3 Saloon Flair 1.2 110BHP
Previous Xsara Picasso 20HDi, C3 SX 1.4HDi, C3 SX 1.6HDI, C4 Picasso 1.6HDi VTR+ EGS 62 Reg C3 Picasso VTR+ 1.6 HDi 92BHP

#4 Supercar

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Posted 13 March 2018 - 05:27 PM

Go for a short drive see if it goes out then check radiator is getting hot below top pipe it could be similar fault to mine last posting 1.6 Hdi. However your model when I had a 2 litre one was a traditional Thermostat housing 3 bolts 120 degrees apart take it out and drop in boiling water in a pint Jug see if it is opening oK, Remember check all safety procedures on doing so re Hot Coolant and spillage on removing.The later models have a plastic housing slightly different hence my request for information


Edited by Supercar, 13 March 2018 - 05:28 PM.


#5 dessolbyjon

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Posted 14 March 2018 - 06:14 AM

many thanks for all your advice, 

the water level sensor is new,

the thermostat is operating correctly,

I cannot see evidence of leakage from the rad,

I will check the wiring, where do you think is best to look first ?



#6 dessolbyjon

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Posted 14 March 2018 - 06:49 AM

I should have added that the system does pressurise and hold pressure until cool



#7 dessolbyjon

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Posted 14 March 2018 - 07:48 AM

have a 2.0hdi mk2 and the top up water level keeps flashing on even though there is enough water in tank, have changed the sensor and still the same problem, disconnected sensor and no warning, any advice would be greatly appreciated 

many thanks for all your advice, 

the water level sensor is new,

the thermostat is operating correctly,

I cannot see evidence of leakage from the rad,

I will check the wiring, where do you think is best to look first ?

the system does stay pressurised until cold


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#8 Supercar

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Posted 14 March 2018 - 08:14 AM

How long are you running the engine for before checking it is pressurised? It has to be hot to pressurise is the header tank cap sealing correctly? Some garages will pressurise the system with a pump to check for leaks.



#9 dessolbyjon

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Posted 14 March 2018 - 08:53 AM

How long are you running the engine for before checking it is pressurised? It has to be hot to pressurise is the header tank cap sealing correctly? Some garages will pressurise the system with a pump to check for leaks.

engine is running now and up to temp,

can tell it is pressurised as top hose cannot squeeze as easy when cold 



#10 dessolbyjon

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Posted 14 March 2018 - 08:59 AM

engine is running now and up to temp,

can tell it is pressurised as top hose cannot squeeze as easy when cold 

temp is on three bars,

header tank full,

still flashes "top up water level" only very very briefly even though header tank full,

should I plug in OBD reader and check/clear any faults ?



#11 dessolbyjon

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Posted 14 March 2018 - 10:02 AM

temp is on three bars,

header tank full,

still flashes "top up water level" only very very briefly even though header tank full,

should I plug in OBD reader and check/clear any faults ?

no faults found



#12 Supercar

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Posted 14 March 2018 - 12:32 PM

Is the radiator hot? all way down to the bottom pipe



#13 dessolbyjon

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Posted 14 March 2018 - 01:38 PM

Is the radiator hot? all way down to the bottom pipe

yes the bottom pipe gets hot first before the thermostat opens, then the top pipe gets hot



#14 Supercar

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Posted 14 March 2018 - 03:36 PM

On header tank  there is a sensor for levels as shown in image provided turn anti-clockwise 90 degrees. (Engine Cold no pressure) A rubber  'O' ring seals the header tank when in situ so you will get a release of coolant when you pull the sensor out about 8 CM long. Deposits form over the 2 probes making a circuit inbetween hence faulty 1, 2, 3 bars etc 'Top Up Coolant' scrape these deposits off replace into header tank with cable at top seal ring pushed in then turn clockwise 90 degrees jobs a good one. Top up with coolant.



#15 Supercar

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Posted 14 March 2018 - 03:39 PM

Will not allow me to post image



#16 dessolbyjon

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Posted 14 March 2018 - 03:46 PM

On header tank  there is a sensor for levels as shown in image provided turn anti-clockwise 90 degrees. (Engine Cold no pressure) A rubber  'O' ring seals the header tank when in situ so you will get a release of coolant when you pull the sensor out about 8 CM long. Deposits form over the 2 probes making a circuit inbetween hence faulty 1, 2, 3 bars etc 'Top Up Coolant' scrape these deposits off replace into header tank with cable at top seal ring pushed in then turn clockwise 90 degrees jobs a good one. Top up with coolant.

done that already and also tried a brand new sensor, still the same fault



#17 Supercar

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Posted 14 March 2018 - 03:57 PM

Mine is cured now you may have wires corroded shorting together somewhere have you cleaned the plug socket out with WD40 see if that helps



#18 dessolbyjon

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Posted 14 March 2018 - 04:20 PM

Mine is cured now you may have wires corroded shorting together somewhere have you cleaned the plug socket out with WD40 see if that helps

checked plug as well, funny thing is that when unplugged no warning at all, truly bizarre 



#19 Supercar

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Posted 14 March 2018 - 05:16 PM

Attached File  20180314_142302.jpg   119.02KB   0 downloadsAttached File  20180314_142520.jpg   73.61KB   0 downloadsAttached File  20180314_142535.jpg   75.19KB   0 downloads

 

Above Header Tank Images

 

Below Cooling Fan Thermostat

 

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#20 dessolbyjon

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Posted 16 March 2018 - 03:13 AM

I bit the bullet and took car into my local mechanic who is the best, he can achieve where others fail,

he suspects either the head gasket or cylinder head because bubbles were coming back to the expansion tank,

will post what is found in case others have the same problem