<VV> Reading the dang manual ...NO CORVAIR (unless yours has aradiator)

[Frank DuVal]

It is a cruel truth that a water temperature sensing bulb needs to be in 
water for the temperature gauge to read correctly. Once the water 
leaves, you have hot air and steam. Neither is read accurately by the 
water temperature sensing bulb.

This came up at work today while discussing why a safety temperature 
switch on a boiler is not as safe as a safety pressure switch, as the 
temperature switch may not respond when there is no water, so the burner 
keeps producing steam pressure. Not a good thing! This is also why a 
water heater has a TP valve, a temperature and pressure relief valve to 
prevent explosions. A temperature valve alone would not protect when the 
water level dropped. So it is not just the automotive field that has 
this problem.

Frank DuVal