[TR] water wetter

[Randall]

> The temperature will still be regulated by the Thermostat. Water Wetter
> or not.

Unless, of course, it isn't.  When I tried Water Wetter, the thermostat was
not controlling coolant temperature.  

And this last time, the issue did appear to be lack of heat transfer between
the coolant and radiator tubes; caused by a layer of gunk inside the tubes.
The Water Wetter still did not appear to reduce coolant temperature, and
certainly did not bring it down enough for the thermostat to close.

-- Randall