There are many reported incidents of the Hilux Surf overheating and causing a cracked head (several hundred pounds to fix). The general consensus is that the coolant and/or thermostat is the problem.
I have taken a lot of time to ensure the information above is correct, but please remember vehicle manufacturers make alterations and design changes during the production run of a vehicle. No liability can be accepted for loss, damage or injury caused by any errors in, or omissions from, the information given above.
If you think any information is incorrect, confusing, misleading or incomplete, please feel free to contact me.