I have a pair of 115 Fichts that I have not used for over 6 months, I started them yesterday, they started OK, but there is not a drop of water from the tell tales on both Motors, the tell tale is not blocked, I guess it would be a miracle if both impellors crapped at the same time, (they were replaced about 18 months ago) or is it more likely that the thermostats are stuck closed? does the tell tale still work before the thermostat opens? also are the thermostats on the top of the block under a big round cover with a large hex head?