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Look at compressor when engine running-You should be able to see if compressor clutch is pulling in. Try with A/C on and then with A/C off to see difference
The The fat lady has sung on that engine. Cheaper to get new engine or car than to attempt to repair -which would be unlikely
If it still blows cold when it is at running temp, check the engine thermostat, its probably stuck in the open position.
The heater core is stoped up / MAYBE. Are the engine is low on coolant, Check coolant level in radiator.
You have a bad fan clutch..............
The MOST COMMON PROBLEM with that engine is that the intake manifold gasket BLOWS / LEAKS water into the engine crankcase and mixes with the oil. Replace the intake gasket and FLUSH The engine oil and change the oil filter SEVERAL TIMES Untill engine cleans up.
you die
You lost the vacuume supply coming from the engine, defrost is the default mode if a mafunction in the vacuume supply is lost.
probally wired the pump wrong
240mph
yes
check your PCV Valve