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What year is your car. My sizes are from a 71 dart.

On mine the upper is 1.5 and the lower is 1.75.

That is a F type expansion valve. The expansion valve removes pressure from the liquid refrigerant to allow expansion or change of state. So it has to be there. Your switch, is there power to the switch? check fuse and wires. If yes and when you select fan speed and fan doent run it is the...

If you really want to go all the way get a heater box from a non A/C car. Plug the hole in the firewall for the old A/C components.

i dont have power steering so i dont know if this will help. 1 belt CS,ALT,AC the second WP,TEN,CS. my tensioner is fairly low, near the crank.

The core could be pluged, try back flushing it. do the heater controls work properly? when sliding the temp control from warm to hot it changes the amount of hot water running through the core, it could be stuck on warm.