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Check the coolant level in the radiator. If the coolant gets low enough the heater is the first thing to stop working. If there is plenty of coolant and the temp gauge is get in up to the half way mark than it's possible the heater core is just about plugged up. Your local repair shop should be familiar with flushing the heater core. I have had many successful heater core flushes over the years and it can save you thousands. If the heater core is successfully flushed it may not be a bad idea to have the coolant flushed at the same time.
Make sure there is no air in the cooling system,and that the cooling fan is working,coming on,and going off on it`s own.if it is not ,replace the coolant sensor.
Make sure the gauge moves if not check the coolant level.
Usually they read from 1/4 to 1/2 when warmed up. Over 3/4==to hot, not moving=no coolant. Low readings are mostly bad senders or worn out motors.
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