Question about Cadet Manufacturing C152 Com-Pak Plus Heater

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Heater runs for 30 seconds, then shuts off for 30 seconds, then runs again for 30 seconds, etc...

Heres what i'm experiencing (after replacing the motor stuff under the grill...not the thermostat)....the heater will run to get itself up to the temp that I set it at, but once it reaches that temp it shuts off for 15-30 seconds and comes back on, runs for 10-25 seconds and again shuts off and repeats, repeats repeats until finally I turn it way down....ideas?

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