Engine temperature fault. nikolarm: Citroen C8: 4: 23-09-17 01:00: Engine fault: damjanb100: Citroen C4 Grand Picasso: 12: 05-11-12 20:44: Lučka ENGINE FAULT: RoXena: Citroen Xsara Picasso: 7: 27-02-11 08:50: Menjava žarnic na armaturki - engine fault: Picdriver: Citroen Xsara Picasso: 2: 04-04-08 06:28 OK - Looks like it's the dealer you bought it from you need to go to then, although you should still be supported by the Citroen dealer network under the warranty, assuming it was a brand new car. You may want to let Citroen try and repair it under that warranty first, as I guess it is possible they will find the problem quickly and sort it out.
How to change engine thermostat on CITROËN C4 Grand Picasso I (UA_) – replacement guide. Free download PDF. 3.44 MB.

So it possibly hasn't done one for some time - hence the blocking warning. But, surely it would have overheated at some point - though they do run cool when idling, and need no fan on the motorway to stay at normal temps of 90. The AC would also probably throw a fault with no fan working. It cools the AC condenser (if you have AC) and runs

Citroen C4 and DS4 Online Support with user help forums, FAQ's and Technical guides C4 Picasso and Grand Picasso - PRE 2013 only :: ENGINE FAULT NEEDS REPAIR Within a few hundred yards of leaving the petrol station the engine fault comes up on the media screen and service light stays on, after a couple of days it goes out but as soon as you fill up again on it comes. The service isn't due. Citroen dealer suggested it maybe supermarket fuel but this has been proven wrong. The car drives fine. G4KYTfD.
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