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It could be your coolant is low.Check it when it is cool and add 50/50 mixture if it is low. If the level is not low your thermostat may be going bad. It controls the flow of the warm fluid to give you heat.
There may not be enough coolant in the system. What happends is the heating core is nothing more than a small radiator inside the car. If the fluid is low the heating core is empty. But once you start driving the water pump works harder and fills it up. Another possible cause is a sticking thermostat. If its stuck open the engine cant retain water to heat it up. Thus blowing cold air. Whith the engine cold remove the radiator cap and check your coolant level. If it is full a replacement thermostat may be needed. HTH and dont forget to rate.
1st you need to make sure no air in your system open you radaiator cap and your heater to max and see if air bubles or circulation is going on fill up accordingly otherwise you have blockage in your system or water pump if no circulation ////make sure no bubles all bubles should be gone////look for coolant circulation in your radiator make sure your thermostat is not defective or placed in the right position.
The first is normal. Your heater gets its heat from the coolant ciculating in your engine. In order for it to work, the coolant needs time to heat up a bit. This is true of just about every vehicle.
When it gets cold again is the puzzler.
My advice is to check the coolant level in the radiator.
ONLY when the engine has cooled.
If the level is down, there can be times when there isn't enough water to cool the engine, fill the radiator and the heater core. The result is the heater blows cold air and the engine runs hotter than normal.
So check the coolant. Open the cap. Start the engine and top it off.