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Message: <blockquote data-quote="Fishfiles" data-source="post: 63307" data-attributes="member: 782"><p>I probally changed 2 thermostats on Bobcats since 1976 and would bet once it really didn't even need a new one ------- it  is really easy to test the thermostat if you have it out already , pry it open enough to insert some dental floss or thread thru it , tie that to a stick or large spoon , hand it off the bottom of a pot with water on the stove with a thermometer in it , boil the water and when it falls off the spring note the temp , the number should be on the thermostat at which it opens , probally like 190 degrees F  (if memory serves me right ) I have found the most common problem for a 753 running hot is the cooling fan belt stretched out or the plastic pulley gets worn along with the belt width worn down and the belt goes farther down into the pulley making the tension looser ,bad motor mounts will affect belt tension ,  second most common would be an externally  clogged up radiator and or oil cooler , seperate the cooler from the radiator and blow air thru all the fins and see whats amount of dust you throw up , if the machine has been run on water and not coolant then and internal blockage could be the problem , a bad or wrong psi radiator cap will cause problems and the aux hydraulics sticking on will run it hot fast also --------------753's had a low coolant level sensor on the radiator -------------------</p></blockquote><p></p>