When I turned on my heater, it was not getting that hot so I did some research and realized that I had AIR in the cooling system. There are two ways to get this air out, Manually: where yo run the car to operational temperature then you bleed the system. Another is witha a Pressure Tester(Below). It will put pressure on the system.
-Fill the coolant reservoir to between the minimum and maximum marks.
-Obtain a coolant system pressure tester and attach it to the coolant reservoir.
-If you don’t have a tester, many of the better auto parts stores will loan you one.
-Pressurize the coolant system slowly until a steady stream of coolant comes out of the vent. Do not exceed 10 psi pressure.
-Close the vent.