Testing fan switch

[Enrique Claure <spanlab@ceibo.entelnet.bo>]

Hi list, I am having fan problems(heating) again and I feel its the darn 
switch. I pulled it out and put in hot water at 80C and the switch was 
open. The Haynes states to put the switch in water and warm up to the 
stamped temperature. Must heating be gradual, I think not but would like to 
hear opinions. Also, where on earth is the temp stamped on the switch? TIA, 
Enrique
SPAN Inc HeadQuarter
PO BOX 6524
La Paz Bolivia
South America