xantia_v6 wrote:CitroJim wrote:As Chris says, the gauge sender effectively reads the bottom hose temperature due to its location so about half of what might seem normal is right. They should under-read under normal running.
The thermostat in a V6 is normally reliable as it's not a conventional one. Good job as they're absolute sods to replace.
Good point Chris to use a Lexia to check the coolant temperature on the engine ECU. This sensor is in the normal place so reads top hose temperature.
The fault is likely to be electrical rather than an engine cooling problem and my first suspect would be the Bitron sensor. It's quite hard to get to and right under all the V6 cooling plumber's nightmare. The connector can get coolant dripping onto it which can cause a poor connection..
I agree with Jim. It is most likely the Bitron sensor gone intermittent, I have had 3 fail on Xantia V6s, and on my last car, it had already been replaced once by the dealer! It is very typical for them to play up about 5 minutes after the car has started. The are not as hard to change as Jim makes out, I did the last one in 10 minutes without even draining the coolant.
My advice is don't think about changing the thermostat without more evidence... That is a tricky job.
Okay, so that's two for the Briton sensor, whatever the hell that is..........., I'm presuming this is can be got from the dealer

or any motor factor

Now the next questions, if it is the Briton sensor how big of a job is it

and can a novice like me do it
xantia_v6 wrote: On your non-bleeding bleed screw, has someone put leak inhibitor into the system which has gummed up the passage?
No idea, I've only had the car 4 weeks....... having said that, the screw came out easily and there was nothing on the screw, I didn't take it all the way out, which I might do when it's cold just to see if anything comes out.