Kiwivan, firstly I’m no mechanic but when I had my 308 sandy it would always run hot and the gauge would go to the maximum on a hot day. I have a mate who is an absolute Holden freak and he told me that everything Holden puts on paper about their cars is correct except the right thermostat for a 308. On his advice I put in a 160 deg thermostat and from that sec on it ran as cool as a cucumber. Just my experience, hope it helps.
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