Turbo and temperature gauge

[Northern Bongolow]

the controlling part of the system, the bit that acts on the stat directly is the heater circuit, in normal conditions, this dictates whether the stat opens or not, if you remove heat from this part of the circuit it must delay the operation of the stat.
so if your engine is screaming for cooler water this is the last thing you need to do.
better to put on your aircon/fans, or select a lower gear thus speeding up the water pump, or against all your instincts rev it up to cool it.

[Driver+Passengers]

the controlling part of the system, the bit that acts on the stat directly is the heater circuit, in normal conditions, this dictates whether the stat opens or not, if you remove heat from this part of the circuit it must delay the operation of the stat.
so if your engine is screaming for cooler water this is the last thing you need to do.
better to put on your aircon/fans, or select a lower gear thus speeding up the water pump, or against all your instincts rev it up to cool it.

Another interesting nugget. Would that not raise combustion temperature or oil temperature due to increased friction, though?

[widdowson2008]

the controlling part of the system, the bit that acts on the stat directly is the heater circuit, in normal conditions, this dictates whether the stat opens or not, if you remove heat from this part of the circuit it must delay the operation of the stat.
so if your engine is screaming for cooler water this is the last thing you need to do.
better to put on your aircon/fans, or select a lower gear thus speeding up the water pump, or against all your instincts rev it up to cool it.

Another interesting nugget. Would that not raise combustion temperature or oil temperature due to increased friction, though?

Having monitored temperatures closely over the last 3 years, although it sounds to be the opposite of what you would expect, what Ady is saying is DOES happen.
I believe how it happens is something on the following lines:
We KNOW that the thermostat is governed by the heater circuit, which has a lot of pipework. The temperature of the coolant in the heater circuit will drop over its length such that when it gets back to the thermostat, it will be lower in temp. By increasing the pump speed (lower gear/higher revs) the coolant has less time to cool off, giving it MORE chance of opening the thermostat, introducing the cooler radiator flow into the mix, and hence cooling the system quicker.
This would also explain why putting the heaters on to get rid of heat doesn't help much.

This sounded OK when I typed it - does it make sense?