Its a long shot I know but
Would a broken and partly blocked exhaust cause a diesel engine to run a bit hotter than usual
My wifes car (a 1998 corsa diesel) has recently started to show 10 degrees more on the temp gauge . Personally it doesnt bother me but she is getting paranoid about it .
I have tried a new thermostat / flushed the whole water system / changed the sender unit and finaly changed the water pump but it all has had no effect .
She has come home from work this afternoon complaining of a knocking noise at the back .
I have had a look and discovered a broken exhaust back box and a sharp bend in the pipe partially blocking the flow .
So I was wondering could this cause the rise in temp
P.S the head gasket has not gone