Hi, My name is ***** ***** for the delay.
I will do my best to assist you
sense the car has been sitting for sometimes,the problem here may be a stuck thermostat..
replace the thermostat and bleed the cooing system..lets bleed it this way
1-remove the radiator/reservoir cap when the engine is cold
2-start the engine and let idle
3-turn the heater on max
4-keep coolant on hand and add it as needed
5-spme coolant may gush out with the air
6-keep doing this until the engine is at operating tempeture and the heater is hot
7-after the coolant settles down and the engine is warm,,install the cap
This may take as long as 20-30 minutes