2016 Berlingo 1.6 HDi overheating

Had this on an Astra. Turned out to be the head gasket, confirmed by a sniff test. Of course, the customer neglected to tell us that the vehicle had been losing coolant for the past year or so and had to be topped up every other week. The "other garage" had already fitted a water pump, thermostat housing and other stuff - also conveniently forgotten about.

The job would be so much easier if people just told us all the facts.

Either a heater valve stuck, air lock or dare I say cyl head  leak?  Go for a sniffer, and then go from there.

all of the above + some of the old pugs used an oil/water intercooler(that fooking big chunk of ally with 2 pipes on it next to the oil filter)and they used to be prone to sh1tting emselves with the symptoms normally being oil in coolant cos oil pressure is generally higher than water.had one rotted solid internally with no coolant flow which gives your symptoms-fine at idle,overheating under load/+ 40 mph ish-which would generally be considered blocked rad,you say thats done.i joined pipes together to bypass to eliminate.as above check pipes for heat(mine felt fine!)and a prior internal oil leak as above can block ANYTHING!!!pipes?matrix?all suspect.had good results clearing internal oil blockages in coolant with biological laundry liquid,run it for a couple of days,
after you pour it in after clean+flush at a slightly stronger level than your normal domestic wash,clean + flush after.for all the above also read transit....bit oddball and im probably wrong but hey,you sound desperate......as an aside is the wiring ok/alternator friar tucked/overcharging under load?just cos the temp reads high dont mean theres an actual coolant problem.....lets face it,psa are famous for the quality of their wiring!