I know this is most probably the wrong group to ask, but nobody in the
Vauxhall (Opel) group gave an answer.
1993 Corsa 1.5TD GLS, Manual, Isuzu Engine.
My corsa once in a while overheats (boils over) for no apparent
reason. I have changed the thermostat, pump, radiator and I have
tested the cooling fan on the radiator, which kicks in at the right
temperature. I noticed in the Haynes manual they mention there is an
oil cooler and a oil cooler thermostat, can some kind soul let me know
the purpose of these items and if they might be the cause of my