Hey so I just got into the yota seen last night when I bought an 85 pick-up with a 350chev in it. Now I took it for a test ride and everything was fine but I guess not really long enough to notice the temps. Last night on the way home the truck over heated, and bolied over. It has 4.88s with 36s with a turbo 400 3speed, so I was doing about 90kmh at 3k rpm. The truck has the rad relocated on the back and has a 16" electric fan pulling. Today I pulled the thermostat, added a 16" fan between the cab and rad to push, and also put a mechanical fan back on the motor to help cool it down up front. I drained the coolant and put brand new coolant in and made sure theres no air in the lines at all.. All of this did nothing really, take a few extra minutes to get up to 220 but gets there in about 10-15m.
I dont know where to go from here, only thing I can think of now is water pump or head gasket. But theres no white smoke at all, and no coolant in the oil or vise versa. The trucks runs great, idles perfect. (after some carb tinkering)
Please help me out guys.