1kz-te Cylinder Head Crack
admin 5/14/2019
1kz-te Cylinder Head Crack Average ratng: 3,8/5 4782 reviews
| jvoelcker wrote: | ||
In your situation, the temp rating of the thermostat was irrelevent - if the lower rad hose was cold neither of the thermostats would have opened. The water flows top to bottom in the rad so the fact that you had done a 'heavy haul' and the bottom hose of the rad was cold indicates that either there is a blockage in the cooling system preventing it from circulating the coolant or the water pump wasn't working properly. All the 80 series have the thermostat in the same place and none of them suffer from overheating. Swap your thermostat with a normal one and I can almost guarantee that the only difference is a 6 degree increase in operating temp, although it may run a bit better are the correct operating temp. |
'In your situation, the temp rating of the thermostat was irrelevent - if the lower rad hose was cold neither of the thermostats would have opened.'
I'm sorry to butt in a little late on this thread but the above comment is an example of how good logic can lead to bad conclusions.
As far as I am aware, the thermostat reacts to the temperature of coolant inside the engine w.r.t. whether it opens or not. The temperature of the coolant in the bottom hose is irrelevant.
The bottom hose can be warm or cold depending on ambient air temperature and air flow through the radiator, but the thermostat can still be open in either event.
As far as I am aware, (and this includes feedback from an insurance expert and a Toyota dealer), the jury is still out concerning the exact cause of cylinder head problems. It will obviously do no harm to lavish attention and £££ on the cooling system, as will praying to the gods of aluminium head castings, but as Bob has (correctly in my opinion) mentioned, some owners (Australian if I recall correctly) have noticed significant reductions in the temperature of coolant exiting the engine via the top hose just by changing thermostats. If a 'tropical' thermostat exists, then, there is perhaps a reason for it .. as the reduced temperatures in the exiting coolant seem to show.
We need more information and experimentation. Some owners never have the problem, or so it seems.
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