Why do you need a new thermostat? Is your motor overheating? Is the telltale flowing? The stat on the MFS25A is near the top of the block, on the port side. See items 2, 3, and 4 in the diagram.
Thanks for the reply. I found it yesterday and changed it out (was all corroded). Still not pissing at all and the hole is not blocked. Didn't think it would be the impeller because I changed all the pump components just 8 months ago. I will change again and see what happens. What else could it be?