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Furnace runs OK, but blower runs again a few seconds later

\015 Happens more when cold, as in the morning or real cold outside temps. Furnace will run & heat normally, but after it shuts down, the blower will start up a few seconds later and run for only a few seconds. Usually once, sometimes twice in quick succession. Furnace is Carrier forced air, about 18 years old. Technician states ''that is what old furnaces do'', cleaned it, checked plenum for cracks, all OK.\015

Answers :

Could be a defective thermostat in the plenum.
\015\012When a gas furnace shuts down the fan(blower) will run until the plenum cools to the safe range. Usually 1 and 1/2 minutes.
\015\012Intermittent operation is a defective thermostat or relay.

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