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Thermostat cycles between low and med at 30sec interval

(1999 Ford Ranger)
in Chesterton, IN on March 01, 2015
Radiator was replaced prior to symptom. Cab heater air temp initially was 125 but dropped to 80 when temp cycles. Is this a sign on air in system?
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Popular Answer
on March 01, 2015
Was the T-Stat replaced?
on March 01, 2015
New tstat and water pump prior to radiator replacement. Heater core was reverse flushed, good flow too.
Thx
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