4JG2 bighorn overheating issues.

[Bighorny4x4]

So I bought a bighorn in canada a few months ago and its been running pretty good either than highway driving (speed sensor is broken and really hard to find a decent priced one here) I was sitting at a park yesterday after doing some errands in town and shut off the engine for a bit. When I fired it back up and drove out of the parking lot the problem started to occur. Out of nowhere the temp rose very high (almost in red) and oil pressure started dropping slowly. the temp will fluctuate very little but will stay hot though. When i started it this morning temp was fine for about 5 KM and same thing happened. Took it to the shop and mechanic checked the fan was pulling enough air, belts are all tight so no slipping of the water pump pulley. Anyone else had an issue like this? I flushed the rad just a couple weeks ago to help prevent something like this from happening but it didn't do much i guess.

[turnturn]

Petrol or Diesel?

Possibly the thermostat.

[Dinger95]

4JG2 is diesel

[geeves]

thermostat or head gasket. Whats the water level and condition like?

[themadaussie]

Take the factory rad out and throw it away, put in a all alloy rad 4 core and cut the top hose in half then you get a inline filter put it in to the hose every now and then undo the cap take the metal filter clean it pop it back all good. change the themo to a new one and change the cap to 0.9 bar one and not 1.1 bar one.
if auto put a remote oil cooler in around 1l cap.
tow all day and cruise @140kph at ease