I'm running an 85 BJ70 with 465,000 km and have had the rad flushed and changed the thermostat twice now but she still heats up once I get over 110 km/hr. The truck is stock (3B) and the rad appears fine. I drive it all year round and even pull a trailer with it a couple times a year but as long as I keep under 110 it won't over heat. Is this common or should I be looking at a new rad or water pump? How can I tell which may need replacing first.
Ken
Ken