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I doubt it's a heater core.
first look in the radiator and make sure your coolant is full.
not just in the overflow bottle. a bad radiator cap may not allow coolant to refill the radiator . so the radiator can be low and you still have a full overflow bottle
so refill everything and drive it a few miles and see if your heat comes back.
It really runs hot within a minute of starting ?
An engine that runs hot in a few minutes is often having problems with the water pump or a blockage in the cooling system. The thermostat does not open until 195 degrees which takes 5 or 10 miles of driving.
During that time, the water pump should be circulating coolant in the block and the heater hoses.
A leaking head gasket should be putting extra pressure into the cooling system, and-or dumping coolant into the cylinders which would come out the exhaust pipe. But it should still take a few minutes for the engine to reach the boiling point of 240 degrees.
take to a shop and have it done if you dont have proper equipment to do it is easy to over or under charge if was shop not friend then take back . when too much is put in at higher speed it will not cool and the specs are in metric and only holds 1.15 lbs of 134-a no more
either the air duct under the dash is broken or diconnected, or you have a broken or disconnected vacume hose or line. unless you have seperate/digital controls for dr/pass air. if that is the case then you need to replace dr side control unit.
It may still be low on freon. It can hold several cans. High side should be around 250psi and low around 35 or 45psi at idle if system is charged. If you raise engine speed the low can drop below 20psi and switch off the compressor if the system is low on freon. Could be a restriction in the system, bad relay, or bad a/c compressor-clutch.
you say it will blow cold and hot air for only a few minutes. You don't say but I assume you mean will blow cold a few min. when turned on AC max , blow hot only a few min. when turned to heater hot. Assuming thats the situation and you say AC charged and shows good on the low side -you should charge the AC to a full charge on the low side will cause problems with the AC air compressor kicking on and off. I suggest while the engine is running and turned to AC cold max watch the AC air compressor clutch to see if it does indeed kick on and off if so charge completely. As far as the heater make certain you coolant is all the way to the top and the best way to do this is when engine is completely cold remove radiator cap and fill completely and completely close cap then fill overflow container just to the cold level. That should fix your problem.