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I would think the heater core or blend door would deal with the heat. Evaporator should be fine if it's blowing cold.
Repair 101, fuel, fire, compression, and timing.
Totally integrated power module.
Possible bad battery in the tire pressure sensor, needs checked.
Make sure it is the expansion valve; Did you check it with a/c gauges.
Compressor clutch fuse? take it to somebody that knows a/c systems. Get away from him.
On the front unit, unless it's a complete stand alone unit.
Leaking, movement side to side, wear, bushings internally, restricted coolant flow, etc.
Check your plug wire location, 'ie' started after changing plugs and wires.