Recently i acquired a 98 Ln167 with the 5l motor in it, the engine has only done 220,000 clicks and it has installed one of those wierd Hi-CLONE 2 things in it, anyway when i drive it and put something on the tray or tow a trailer behind it and sit on a 110 the temp guage rapidly rises to the red, however if i drop back to 95 or even a 100 the temp goes back down?
I am confused as to what would be causing this issues, a week ago i dumped the water/coolant out and topped it back up with decent coolant but this hasnt seemed to help. Any advice would be muchly appreciated thank you.