To rule out (or rule in) the speed sensor, engage the system, set to max cool, pull the spade connectors off the binary pressure switch (on the receiver dryer), short the leads together (the wires, not the switch). If the compressor comes on and stays on, it's not your speed sensor. If it comes on and the releases, guess what??
2000 Dodge Grand Caravan SE
No matter what you fix, there will always be something else to fix..
"Warranty" is just another way of postponing the inevitable.