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The dash gauges are notoriously inaccurate. But it is possible that the thermostat is stuck open. Does the upper radiator hose get hot after engine warmed up? Also feel both heater hoses-when engine is warm, both should be hot-indicating the coolant is circulating through the heater core. If heater hoses are hot, and you still have cold air, the temperature blend door on the heater case may not be operating.
Try a new thermostat and see if engine warms up faster and better.
Could be a stuck thermostat... or low coolant level. feel hoses going to heater core, if only one is hot while car is warmed up. i would say the heater core is plugged because this is where you get the heat for inside of car ! hot coolant goes through heater core and a fan blows it out to heat inside of car. if both are hot then the heater core is ok.
This is usually caused by a control door inside the housing for the heater. Sometimes pens or other obstacles go down the defroster vents and block the doors. Lay on the floorboard while someone controls the heat and vent controls. You should be able to see the arms controlling the vents and heat. You may have to remove the lower dash covers to gain access to see these controls. Also check to see if there are any engine vacuum leaks. The heater and vent controls are ran by vacuum sometimes.
i actually used to have a 1995 pontiac grand am that did the same thing....only difference was i didn't have to restart the car....usually what i would do was drop the car in neutral and gas the car and i'd notice my temp gauge go down and my heater gave heat.....chances are it's a sticky termostat. Hopefully that helped.
Well looking at your tests here the only logical explanation is that you have a bad blend door switch, blend door servo, air leak in the control valve for the blend door, or the blend door has broken off in the air duct or some other obstruction in the air duct blocking the flow of air to the heater core.