Built a heat pump with an old chrysler 2 piston compressor and parts from cars 30 years ago. Welded the magnetic clutch closed, belt driven with 5 HP 184T frame motor.
Worked well for a while, I did not pay enough attention to suction line slopes and ran a rod thru the piston head one day due to an oil slug; so, not a simple as just hooking it up. Pay attention to suction line slopes. The car has a huge condensor fan an relatively small condensor, and even smaller evaporator compared to same BTU rating mini-split, so you should double up on evap and condensor - I used 2 evaporators in parallel with 2 TXV, one feeding each evap. Did a GSHP from a pond and used car evap for one and 30 feet of pipe inside poly pipe for tube in tube diy evaporator, series condensors. Assy advantage was that the 1960s/70s cars used all flare fittings so easy to assemble.
Next try used scroll compressor, much lower noise level, works much better, etc. .
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