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Are You RWC Or FWC?
Why not take the thermostat out and see what is going on? They you can test the thermostat in a pan of heated water to see if it is closing and opening correctly.
If the thermostat is cruded up maybe all you need is to soak the thermostat in vinegar. If the cooling system is full of crud it would be a good time to do an acid flush.
TRUE GRIT
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