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If the thermostat is bad (i.e. stuck open at all times), this would allow coolant to circulate in the engine even when it is below the desired operating temperature. This leads to OVERcooling of the engine. You can either replace the thermostat as a first step or remove it and test it -- closed when cold, open when heated above 190-200F.
ok the ac will cycle even if its not on thats the way the factory has it set up. the fan will also cycle the same way. but the temp of the motor has to do with the thermostat thats whare i would be looking the thermostat may be bad when you pick up a new one test it if it says 180 deg. that is when its wide open check it with a temp guage a house hold type in a pot of boiling water on your stove i have found 1 out fo 6 would be good go figure. now the censors. one wire tells you temp guage 2 wires tells you its a switch for the fan while the motor is running use the same house hold guage a meat thermomiter will work just fine
sure you can have the codes checked. but lets look at your coolant temp not raising that tells me your thermostat is stuck open . the thermostat wont cause the engine light to come on and it wont say replace the thermostat it will give you the problems of running a cold engine. (try the thermostat)